Updated on 2021/11/14

写真a

 
TANIKAWA Toko
 
Organization
Graduate School of Bioagricultural Sciences Associate professor
Graduate School
Graduate School of Bioagricultural Sciences
Undergraduate School
School of Agricultural Sciences Department of Bioenvironmental Sciences
Title
Associate professor
External link

Degree 1

  1. 博士(農学) ( 2004.6   名古屋大学 ) 

Research Interests 10

  1. Biogeochemistry

  2. Nutrient dynamics

  3. 物質循環

  4. 有機物の安定化

  5. GPR

  6. Soil chemistry

  7. 土壌酸性化

  8. 人工林管理

  9. カルシウム

  10. Sulfur

Research Areas 3

  1. Life Science / Forest science  / Soil Science

  2. Life Science / Plant nutrition and soil science

  3. Life Science / Forest science

Research History 3

  1. Nagoya University   Graduate School of Bioagricultural Sciences   Associate professor   Ph.D

    2019.4

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    Country:Japan

  2. Mie University

    2015 - 2019.3

  3. 森林総合研究所関西支所

    2003 - 2019.3

Education 1

  1. Nagoya University

Professional Memberships 10

  1. 日本森林学会   Section editor of Journal of Forest Research

    2020

  2. 中部森林学会   中部森林研究編集委員

    2020 - 2020.3

  3. 中部森林学会   主事

    2019

  4. 日本森林学会   日本森林学会代議員

    2014 - 2018

  5. 日本森林学会   日本森林学会誌編集委員

    2008 - 2012

  6. THE JAPANESE SOCIETY of FOREST ENVIRONMENT

  7. THE ECOLOGICAL SOCIETY OF JAPAN

  8. THE JAPANESE FOREST SOCIETY

  9. JAPANESE SOCIETY OF SOIL SCIENCE AND PLANT NUTRITION

  10. JAPANESE SOCIETY OF PEDOLOGY

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Committee Memberships 2

  1. 日本森林学会   Journal of Forest Research 常任編集委員  

    2020.4   

  2. 日本森林学会   代議員  

    2014.4 - 2018.3   

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    Committee type:Academic society

Awards 1

  1. Best Paper Award

    2004.4   Japanese Society of Soil Science and Plant Nutrition   Vertical distributions and accumulations of sulfate in Andisols and Inceptisols –Adsorbed and soluble sulfate fractions-

    Toko Tanikawa, Masamichi Takahashi, Akihiro Imaya and Kazuhiro Ishizuka

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

    Distributions and accumulations of sulfate in soil profiles of Japanese Andisols and Inceptisols under forest vegetation were investigated. The concentration of phosphate-extractable sulfate increased with depth, reaching its maximum at around 50-100 cm depth. Andisols contained a significantly larger amount of phosphate-extractable sulfate (16-880 mg S kg-1) than Inceptisols (10-296 mg S kg-1). This high concentration of PO4-extractable S in Andisols was larger than those in other soils reported in North America and Europe. The concentrations of chloride-extractable and water-soluble sulfate were significantly lower than that of phosphate-extractable sulfate in both soils. Thus, adsorbed sulfate was the predominant form of sulfate in the soils, accounting for about 30 % of total sulfur in Andisols and Inceptisols.
    The strong correlations between phosphate-extractable sulfate and inorganic amorphous aluminum and iron oxides, crystalline iron oxide and allophane indicated that these oxides and clay minerals contribute to sulfate adsorption. The relationships between chloride-extractable sulfate and the minerals show that the minerals also affect the exchangeable sulfate concentration. In addition, the large amount of minerals apparently results in a high sulfate adsorption capacity that keeps the concentration of water-soluble sulfate low in subsoils of Melanudands.
    The accumulation of phosphate-extractable sulfate down to 1 m depth ranged from 870 to 2670 kg S ha-1 in Andisols,and from 91 to 1440 kg S ha-1 in Inceptisols. These high accumulations of sulfate mean that the sulfate adsorption mechanism is important to retain sulfur compounds in Japanese forest soils.

 

Papers 67

  1. Can ground-penetrating radar detect adjacent roots and rock fragments in forest soil? Reviewed

    Tanikawa, T., Ikeno, H., Yamase, K., Dannoura, M., Aono, K., Hirano, Y.

        2021

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1007/s11104-021-05116-3

  2. Leachate from fine root litter is more acidic than leaf litter leachate: A 2.5-year laboratory incubation. Reviewed

    Tanikawa, T., Fujii, S., Sun L., Hirano, Y., Matsuda, Y., Miyatani, K., Doi, R., Mizoguchi, T., Maie, N.

    Science of the Total Environment   Vol. 645   page: 179 - 191   2018

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.scitotenv.2018.07.038

  3. Acidification processes in soils with different acid buffering capacity in Cryptomeria japonica and Chamaecyparis obtusa forests over two decades. Reviewed

    Tanikawa, T., Sobue, A., & Hirano, Y.

    Forest Ecology and Management   Vol. 334   page: 284 - 292   2014.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  4. Sulfur accumulation in soil in a forested watershed historically exposed to air pollution in central Japan Reviewed

    Toko Tanikawa, Hiroyuki Sase, Sei Fukushima, Yoshiaki Ito, Michiru Yamashita, Naoyuki Yamashita, Masato Kamisako, Akifumi Sugiyama, Akihiro Imaya, Takuya Ishida, Chisato Takenaka, Masamichi Takahashi

    Geoderma   Vol. 407   page: 115544 - 115544   2022.2

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.geoderma.2021.115544

    Scopus

  5. 秋田県の海岸砂丘に生育するクロマツおよび植栽広葉樹数種の根系分布 Reviewed

    新田響平,野口宏典,太田敬之,小野賢二,萩野裕章,野口享太郎,大谷達也,宇川裕一,小森谷あかね,谷川東子,平野恭弘,鈴木覚.

    森林総合研究所研究報告   Vol. 20   page: 169 - 184   2021.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  6. 海岸防災林造成を目的として植栽された広葉樹とクロマツの土壌特性に基づく成長と根系発達. Reviewed

    太田敬之, 新田響平, 宇川裕一, 小野賢二, 萩野裕章, 谷川東子, 大谷達也, 平野恭弘, 小森谷あかね, 野口宏典.

    森林総合研究所研究報告   Vol. 20   page: 195 - 204   2021.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  7. Colonization status and community structure of arbuscular mycorrhizal fungi in the coniferous tree, Cryptomeria japonica, with special reference to root orders Reviewed

    Yosuke Matsuda, Kohei Kita, Yudai Kitagami, Toko Tanikawa

    PLANT AND SOIL     2021.9

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    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Aims Arbuscular mycorrhizal (AM) fungi are intimately associated with fine roots and are involved in nutrient acquisition. However, little information is available on the links between roots of individual orders and fungus colonization and community structure. Our aim was to elucidate AM fungal communities in the fine root systems of the temperate coniferous tree species, Cryptomeria japonica (Cupressaceae). Methods We characterized the morphological traits of AM fungi microscopically and determined the community structure of AM fungi using metabarcoding with an Ion Torrent Personal Genome Machine (PGM) focusing on lower-order roots from first to third order roots. Results Paris-type and Arum-type AM morphologies were both generally more prevalent on first-order roots than on second- or third-order roots, but the colonization rates by the Paris type were higher than those by the Arum type. We found a total of 48 fungal operational taxonomic units dominated by Glomeraceae, and all the AM taxa detected on third order roots were also found on first and/or second order roots. In the case of the second and third orders, AM fungal communities were affected by soil conditions: electrical conductivity, pH, and N concentration. Conclusion These results suggest that the abundance and species richness of AM fungi vary among lower root order systems, and that the AM community is sensitive to soil conditions and turns over as roots age.

    DOI: 10.1007/s11104-021-05147-w

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  8. Root system of the giant Cryptomeria japonica tree collapsed at Shinmei shrine in Okute town, Gifu, in July 2020 Reviewed

    Yasuhiro Hirano, Kazuki Nanko, Ryuusei Doi, Rei Nishimura, Tetsuya Iriyama, Toko Tanikawa

        2021.9

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    Authorship:Last author   Publishing type:Research paper (scientific journal)  

  9. Can ground-penetrating radar detect adjacent roots and rock fragments in forest soil? Reviewed

    Toko Tanikawa, Hidetoshi Ikeno, Keitaro Yamase, Masako Dannoura, Kenji Aono, Yasuhiro Hirano

    PLANT AND SOIL     2021.8

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Aim Ground-penetrating radar (GPR) has been used for estimating root biomass, estimating pull-out resistance force of roots, and reconstructing root system architecture. Although GPR can estimate the diameter of a single root, it has not yet been verified whether it can successfully estimate the diameters of adjacent roots or whether rock fragments occurring in the soil matrix can be misidentified as roots. This study aimed to (1) evaluate the visual properties of GPR images of root bundles and rock fragments, and (2) clarify whether they have the potential to create non-negligible errors in GPR surveys. Methods Root bundle samples buried in a sandy soil bed were scanned using 900 MHz and 1500 MHz antennas. Sole roots of Cryptomeria japonica and rock fragments in the bed were also scanned. Results A bundle of root formed one hyperbola with an apex in the radar profile, like a sole root. However, the contrast of the hyperbolas was weak and GPR indices relating to diameter were reduced compared to those of the comparably sized sole root. Stones did not form clear images, but boulders were faintly visible with non-negligible GPR indices. Conclusions For evaluation of root biomass, adjacent roots had the potential to lead to significant errors. Similarly, in reconstructions of root system architecture, adjacent roots might lead to incorrect modelling of root point connections, because of incorrect diameters. For pull-out resistance force, adjacent roots could lead to only underestimation, i.e., safe-side error. Misidentification of rock fragments as roots depends on their sizes.

    DOI: 10.1007/s11104-021-05116-3

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  10. Reconstruction of Conifer Root Systems Mapped with Point Cloud Data Obtained by 3D Laser Scanning Compared with Manual Measurement Reviewed

    Chikage Todo, Hidetoshi Ikeno, Keitaro Yamase, Toko Tanikawa, Mizue Ohashi, Masako Dannoura, Toshifumi Kimura, Yasuhiro Hirano

    FORESTS   Vol. 12 ( 8 )   2021.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:MDPI  

    Three-dimensional (3D) root system architecture (RSA) is a predominant factor in anchorage failure in trees. Only a few studies have used 3D laser scanners to evaluate RSA, but they do not check the accuracy of measurements. 3D laser scanners can quickly obtain RSA data, but the data are collected as a point cloud with a large number of points representing surfaces. The point cloud data must be converted into a set of interconnected axes and segments to compute the root system traits. The purposes of this study were: (i) to propose a new method for easily obtaining root point data as 3D coordinates and root diameters from point cloud data acquired by 3D laser scanner measurement; and (ii) to compare the accuracy of the data from main roots with intensive manual measurement. We scanned the excavated root systems of two Pinus thunbergii Parl. trees using a 3D laser scanner and neuTube software, which was developed for reconstructing the neuronal structure, to convert the point cloud data into root point data for reconstructing RSA. The reconstruction and traits of the RSA calculated from point cloud data were similar in accuracy to intensive manual measurements. Roots larger than 7 mm in diameter were accurately measured by the 3D laser scanner measurement. In the proposed method, the root point data were connected as a frustum of cones, so the reconstructed RSAs were simpler than the 3D root surfaces. However, the frustum of cones still showed the main coarse root segments correctly. We concluded that the proposed method could be applied to reconstruct the RSA and calculate traits using point cloud data of the root system, on the condition that it was possible to model both the stump and ovality of root sections.

    DOI: 10.3390/f12081117

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  11. Dynamics of soil reinforcement by roots in a regenerating coppice stand of Quercus serrata and effects on slope stability. Reviewed

    Yamase, K., Todo, C., Torii, N., Tanikawa, T., Yamamoto, T., Ikeno, H., Ohashi, M., Dannoura, M., Hirano, Y.

    Ecological Engineering   Vol. 162   page: 106169   2021.4

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    Language:English   Publishing type:Research paper (scientific journal)  

  12. Dynamics of soil reinforcement by roots in a regenerating coppice stand of Quercus serrata and effects on slope stability Reviewed

    Keitaro Yamase, Chikage Todo, Nobuyuki Torii, Toko Tanikawa, Tomonori Yamamoto, Hidetoshi Ikeno, Mizue Ohashi, Masako Dannoura, Yasuhiro Hirano

    ECOLOGICAL ENGINEERING   Vol. 162   2021.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Regeneration by sprouting in secondary forests is a necessary technique not only for the utilization of forest resources, but also for maintaining forest health by regrowth and avoiding slope instability caused by over-sized aboveground biomass. The strength of soil reinforcement by roots generally decreases during the tree death process in deforestation, such as clear-cutting, whereas root system strength temporarily decreases in trees that regenerate sprouting after cutting. However, quantitative evaluation of decreasing soil reinforcement by roots and slope stability has not been conducted during regeneration. In this study, we evaluated changes in the number of roots and root distribution up to 3 years after cutting in the regeneration process of Quercus serrata, a major dominant species of secondary forests in warm and cool temperate zones in Japan. We also estimated soil reinforcement by roots: additional cohesion from roots using the root bundle model, and slope stability based on a factor of safety by dividing the effect of the tree root system into vertical and horizontal cohesion with soil physical properties. After cutting at the height of approximately 0.2 m, the aboveground sprouting branches immediately regenerated, whereas the belowground root system gradually decayed. The additional cohesion from roots in trees before cutting was calculated as 34.6 kPa, whereas it decreased significantly to 21.7 kPa in living stumps 3 years after cutting. The value for the factor of safety with a saturated soil thickness of 0.7 m was calculated as 1.20 in soil under trees before cutting, whereas it decreased significantly to 1.11 in soil under living stumps in the 3 years after cutting. The safety factor?s value to 0.99 in soil under dead stumps, which did not regenerate sprouts within 3 years after cutting. We concluded that the probability of slope failure was significantly greater in the dead stumps than in the living stumps and could vary depending on the dynamics of above and below-ground parts, including fine roots.

    DOI: 10.1016/j.ecoleng.2021.106169

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  13. A quantitative evaluation of soil mass held by tree roots Reviewed

    Toko Tanikawa, Hidetoshi Ikeno, Chikage Todo, Keitaro Yamase, Mizue Ohashi, Toru Okamoto, Takeo Mizoguchi, Katsuhiro Nakao, Shinji Kaneko, Atsushi Torii, Yoshiyuki Inagaki, Asami Nakanishi, Yasuhiro Hirano

    TREES-STRUCTURE AND FUNCTION   Vol. 35 ( 2 ) page: 527 - 541   2021.4

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

    Key message Tree roots hold soil that is dramatically heavier than the tree biomass, wet or dried. This soil might compensate for the imbalance between above- and belowground mass. Root-soil plates are recognized to play an important role in root anchorage of plate-like root system, however, actual measurements of their mass have rarely been reported. Even though the root-soil plate mass is often estimated using aboveground allometric indices, no research confirms the validity. Seven root-soil plates of Cryptomeria japonica fallen by Typhoon Jebi were divided into roots and soil, and their weights were directly measured. Mass of the seven plates ranged from 251 to 3070 kg on a dry basis. Roots accounted for 8% of total plate mass and soil for 92%. The mass of the soil held in the plates was 2.8 times greater than tree biomass. The root-to-shoot biomass ratio was 0.26, whereas the ratio of root-soil plate mass to shoot biomass was 3.9, meaning that the root-soil plate mass was much greater than aboveground biomass. These results suggest that the soil mass held in the plate is the main component of whole-tree mass including the plate. The root system holds soil weighing as much as 13 times the root system's mass. The soil might balance the aboveground weight of the tree by adding mass. Aboveground allometric indices are good indicators of root-soil plate mass and allow the belowground mass to be estimated to understand tree anchorage without soil disturbance.

    DOI: 10.1007/s00468-020-02054-y

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  14. 人工林で営まれる植物-土壌-微生物間相互作用がもたらすもの

    谷川 東子

    生物資源   Vol. 15 ( 1 ) page: 12 - 24   2021

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    Authorship:Lead author   Language:Japanese   Publisher:農学生命科学研究支援機構  

    CiNii Article

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  15. Washing methods for Moso bamboo (Phyllostachys pubescens) leaf litter and effects on elemental components. Reviewed

    Umemura, M., Tanikawa, T.

    Bamboo Journal   Vol. 32   page: 37 - 47   2021

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  16. Reconstruction of conifer root systems mapped with point cloud data obtained by 3D laser scanning compared with manual measurement. Reviewed

    Todo, C., Ikeno, H., Yamase, K., Tanikawa, T., Ohashi, M., Dannoura, M., Kimura, T., Hirano, Y.

    Forests   Vol. 12   page: 1117   2021

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    Language:English   Publishing type:Research paper (scientific journal)  

  17. Colonization status and community structure of arbuscular mycorrhizal fungi in the coniferous tree, Cryptomeria japonica, with special reference to root orders Reviewed

    Matsuda, Y., Kita, K., Kitagami, Y., Tanikawa, T.

    Plant and Soil     2021

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1007/s11104-021-05147-w

  18. Root system of the giant <i>Cryptomeria japonica</i> tree collapsed at Shinmei shrine in Okute town, Gifu, in July 2020.

    HIRANO Yasuhiro, NANKO Kazuki, DOI Ryuusei, NISHIMURA Rei, IRIYAMA Tetsuya, TANIKAWA Toko

    Root Research   Vol. 30 ( 3 ) page: 65 - 75   2021

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    Language:Japanese   Publisher:Japanese Society for Root Research  

    <p>On the night of July 11, 2020, the giant <i>Cryptomeria japonica</i> tree collapsed during the heavy rainfall event in Okute Town, Gifu. The purpose of this study is to clarify the characteristics of the root system of the fallen tree together with the weather conditions such as heavy rainfall at the time. In July 2020, there were few sunshine hours which could induce higher water contents of the tree and soils. A large area of decay was observed in the root system close to the center of the stem and roots remaining in the soil showed signs of stripping. Using a laser scanner, the three-dimensional structure of the tree was digitally reproduced, and the volume of root system was estimated to be 43.2 m<sup>3</sup>. The diameter of the root-soil plate and the volume ratio to the aboveground part suggested that the root system of the tree was relatively small compared with those of other <i>C. japonica</i> trees. Based on the evaluation of the root system and weather conditions, the soil reinforcement by roots could be reduced due to decay during the long-term growth periods, and the balance between the above- and below-ground parts of the tree might be disrupted by the increase in the water contents of the tree and soils caused by prolonged rainfall and lack of sunlight.</p>

    DOI: 10.3117/rootres.30.65

    CiNii Article

  19. 秋田県の海岸砂丘に生育するクロマツおよび植栽広葉樹数種の根系分布 Reviewed

    新田響平, 野口宏典, 太田敬之, 小野賢二, 萩野裕章, 野口享太郎, 大谷達也, 宇川裕一, 小森谷あかね, 谷川東子, 平野恭弘, 鈴木覚

    森林総合研究所研究報告   Vol. 20   page: 169 - 184   2021

  20. 海岸防災林造成を目的として植栽された広葉樹とクロマツの土壌特性に基づく成長と根系発達 Reviewed

    太田敬之, 新田響平, 宇川裕一, 小野賢二, 萩野裕章, 谷川東子, 大谷達也, 平野恭弘, 小森谷あかね, 野口宏典

    森林総合研究所研究報告   Vol. 20   page: 195 - 204   2021

  21. Washing methods for Moso bamboo (Phyllostachys pubescens) leaf litter and effects on elemental components. Reviewed

    Umemura, M, Tanikawa, T

    Bamboo Journal   Vol. 32   page: 37 - 47   2021

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  22. Effects of microhabitats and soil conditions on structuring patterns of nematode communities in Japanese cedar (Cryptomeria japonica) plantation forests under temperate climate conditions Reviewed

    Yudai Kitagami, Toko Tanikawa, Yosuke Matsuda

    SOIL BIOLOGY & BIOCHEMISTRY   Vol. 151   page: 108044   2020.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The effect of biotic factors impacted by abiotic conditions on nematode communities is not fully understood in forest ecosystems. Monoculture forests with low understory diversity would provide an ideal model system to investigate the relationship between nematode community structure and environmental factors in forest ecosystems. The aim of this study was to clarify the determinant environmental factors shaping community structures of soil nematodes in Japanese cedar (Cryptomeria japonica) forests. Nematodes collected from litter and soil samples were morphologically identified at the family or genus level and divided into trophic groups. Nematodes were discriminated into a total of 40 (including 2 unique taxa) and 52 (including 14 unique taxa) taxa in litter and soil samples, respectively. Variation in microhabitat substrates created contrasting nematode assemblages between litter and soil samples. Moreover, nematodes identified from litter habitats were a subset of those from soil samples. Bacterivorous and fungivorous nematodes were present in high proportions in both sample types. Herbivorous nematodes were the third most abundant trophic group in soil samples, but were rare in litter samples. The nematode community structure in soils was significantly ordinated by water, C, N, hyphae, and soil pH. The pH is most likely to affect ecological function of soil nematodes indirectly by altering microbial biomass. Our results showed that microhabitat substrates, that is, soil and litter, have a crucial effect on nematode assemblage patterns in temperate coniferous forests. Moreover, soil nematode assemblages were diversified due to the high spatial heterogeneity of proximate soil environments.

    DOI: 10.1016/j.soilbio.2020.108044

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  23. Morphological traits of Chamaecyparis obtusa fine roots are sensitive to soil acid buffering capacity Reviewed

    Ryuusei Doi, Toko Tanikawa, Ryusei Wada, Yasuhiro Hirano

    PLANT AND SOIL   Vol. 452 ( 1-2 ) page: 73 - 85   2020.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Aims The purpose of this study was to clarify how the morphological traits of Chamaecyparis obtusa (Sieb. & Zucc.) Endl. roots vary with soil acid buffering capacity (ABC), i.e., along a gradient in soil acidification. We used an order-based root classification system instead of a diameter-based root classification system, as the former relates better to root function. Methods We sampled 210 intact fine root systems up to the fourth order and measured the morphological traits of a total of 16,657 individual branch-order roots in three C. obtusa stands with high soil ABC and four stands with low soil ABC. Results We found significant differences in the morphological traits of the first- to fourth-order roots between the soil ABCs. In the low-ABC soils, the fine root systems consisted of more and thinner roots than in the high-ABC soils. The diameter of the second-order roots was positively correlated with the soil pH and the concentration of base cations, but negatively with soil aluminum. Conclusion Morphological traits of fine roots are sensitive indicators of soil acidification in C. obtusa forests.

    DOI: 10.1007/s11104-020-04561-w

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  24. Detection of Tree Roots Using Ground Penetrating Radar for Disaster Mitigation

      Vol. 64 ( 3 ) page: 87 - 112   2020

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    Authorship:Lead author   Language:Japanese  

    CiNii Article

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  25. Estimating slope stability by lateral root reinforcement in thinned and unthinned stands of Cryptomeria japonica using ground-penetrating radar Reviewed

    Yamase K, Tanikawa T, Dannoura M, Todo C, Yamamoto T, Ikeno H, Ohashi M Aono K, Doi R, Hirano Y

    Catena   Vol. 183 ( 183 ) page: 104227   2019.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    Tree root diameter and root distribution are crucial factors for root reinforcement in forest soils and can be estimated using nondestructive ground-penetrating radar (GPR). However, no studies on estimating root reinforcement have been performed using GPR. The aim of this study was to evaluate root reinforcement using GPR in thinned and unthinned stands of Cryptomeria Japonica in Andisols. Roots in each stand were detected using a 900 MHz GPR and the diameter and horizontal distribution of roots were estimated. Roots were also excavated to compare their GPR estimates. The relationships between root diameter and tensile force were established through field pullout tests. Finally, root reinforcements in each stand were estimated using the recently proposed root bundle model (RBM). There were no significant differences in the diameter frequency distribution of roots estimated between thinned and unthinned stands, determined using either the GPR or excavation methods. The detection frequency of the number of roots > 5 mm in diameter using GPR was 27.2%, but it increased to 58.7% for roots > 10 mm. The waveform indexes, determined using the sum of time intervals between zero crossings (ET) of all reflection waveforms of GPR, had a significant linear relationship with the diameters of excavated roots, indicating that waveform index could be used to estimate root diameter using the GPR index in these stands. Furthermore, the relationship between the root tensile force (F) and- root diameter (d) was estimated as F = 15.69 d(1.75) (R-2 = 0.87). The root reinforcements at the center of gaps between individual trees were estimated to be 23.4-32.9 kPa in the thinned stand and 8.8-23.9 kPa in the unthinned stand using GPR. These values ranged from 31.9% to 170.7% of those obtained by using the excavation method. There were no significant differences in root reinforcement between thinned and unthinned stands, regardless of the method used. This study revealed that GPR, together with diameter-tensile force relationships, can nondestructively estimate root reinforcement in managed forests. This protocol can be applied to manage forests to evaluate the effects of management on belowground roots.

    DOI: 10.1016/j.catena.2019.104227

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  26. Variation in the morphology of fine roots in Cryptomeria japonica determined by branch order-based classification Reviewed

    Wada R, Tanikawa T, Doi R, Hirano Y

    Plant and Soil   Vol. 444 ( 1-2 ) page: 139 - 151   2019.11

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    Aims This study assessed intraspecific variation in morphological traits of the fine root branch orders of Cryptomeria japonica, and identified variation in the diameter of the first three-order roots among species types with mycorrhiza, and the diameter of first-order roots at the family level. Methods Diameter, length, and specific root length of branch order roots (up to the fourth-order) were measured in intact fine root systems collected in four C. japonica stands. Relationships between soil chemical properties and morphological traits of the first- to fourth-order roots were investigated. The diameter of roots of 52 tree species reported in previous studies was compared at species types with mycorrhiza and at family level. Results The diameter of first-order roots in C. japonica varied by 1.2 times among stands. Negative correlations between soil NH4+ content and specific root length of the second- and third-order roots were observed in C. japonica. The diameter of first- and second-order roots forming arbuscular mycorrhiza in coniferous trees were significantly higher than those of roots forming ectomycorrhiza in coniferous and broadleaf trees. The diameter of first-order roots in Cupressaceae were significantly larger than those of Pinaceae, Sapindaceae, Betulaceae, and Fagaceae. Conclusions Clarifying intraspecific variation in morphological traits of C. japonica lower-order roots may contribute to understanding their responses to different site conditions such as soil inorganic nitrogen contents.

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  27. Free-living nematodes associated with pine cones of Pinus thunbergii and P. taeda at Japanese coastal and inland forest sites. Reviewed

    Kitagami,Y., Kanzaki, N., Tanikawa, T., Matsuda, Y.

    Nematology   Vol. 21 ( 4 ) page: 389 - 400   2019.4

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    DOI: https://doi.org/10.1163/15685411-00003221

  28. Reconstruction of root systems in Cryptomeria japonica using root point coordinates and diameters. Reviewed

    Ohashi, M, Ikeno, H, Sekihara, K, Tanikawa, T, Dannoura, M, Yamase, K, Todo, C, Tomita, T, Hirano, Y

    Planta   Vol. 249 ( 2 ) page: 445 - 455   2019.2

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    Main conclusionWe developed simple algorithms for reconstructing tree root system architecture using only the root point coordinate and diameter, which can be systematically obtained without digging up the root systems.Root system architecture (RSA) is strongly related to various root functions of the tree. The aim of this study was to develop a three-dimensional (3D) RSA model using systematically obtained information on root locations and root diameters at the locations. We excavated root systems of Cryptomeria japonica and systematically obtained XYZ coordinates and root diameters using a 10-cm grid. We clarified the patterns of the root point connections and developed a reconstructed root system model. We found that the root diameters farther from the stump centre are smaller. Additionally, we found that the root lengths of the segments running between the base and the connected root point were smaller than those of other root segments, and the inner angle between the base and the stump and between the base and the connected root point was narrower than for the other pairs. The new RSA model developed according to these results had average accuracies of 0.64 and 0.80 for estimates of total volume and length, respectively. The developed model can estimate 3D RSA using only root point data, which can be obtained without digging up root systems. This suggests a wide applicability of this model in root function evaluation.

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  29. Response of river water chemistry to changing atmospheric environment and sulfur dynamics in a forested catchment in central Japan Reviewed

    Hiroyuki Sase, M. Takahashi, K. Matsuda, K. Sato, T. Tanikawa, N. Yamashita, T. Ohizumi, T. Ishida, M. Kamisako, R. Kobayashi, S. Uchiyama, T. Saito, M. Morohashi, H. Fukuhara, S. Kaneko, T. Inoue, T. Yamada, C. Takenaka, I. Tayasu, T. Nakano, T. Hakamata, S. Ohta

    Biogeochemistry   Vol. 142 ( 3 ) page: 357 - 374   2019.2

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    DOI: 10.1007/s10533-019-00540-1

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  30. Stability of Pinus thunbergii between two contrasting stands at differing distances from the coastline Reviewed

    Chikage Todo, Chie Tokoro, Keitaro Yamase, Toko Tanikawa, Mizue Ohashi, Hidetoshi Ikeno, Masako Dannoura, Kouhei Miyatani, Ryuusei Doi, Yasuhiro Hirano

    FOREST ECOLOGY AND MANAGEMENT   Vol. 431   page: 44 - 53   2019.1

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    The extent of damage to Pinus thunbergii trees in coastal forests resulting from the tsunami caused by the Great East Japan Earthquake in 2011 differed depending on the local environment. The height (H) of P. thunbergii was generally limited in stands closer to the coastline and these trees could fail due to the force of the tsunami. The resistance forces of coastal forests to tsunamis are expressed as critical turning moments and measured by tree pulling experiments. However, few studies have focused on the differences in the critical turning moment between stands with locally different environmental conditions among P. thunbergii coastal forests. We determined the differences in the critical turning moments of P. thunbergii in two contrasting sites having different distances from the coastline. We also estimated the tolerance of P. thunbergii in the two sites against loading from tsunami. Two experimental plots, sea-side and land-side, in a coastal P. thunbergii forest were established with different depths of the water table belowground and wind forces. In both plots, the aboveground traits, including the diameter at breast height (DBH), and H x DBH2 of P. thunbergii, were positively correlated with the critical turning moments. In particular, when P. thunbergil had the same H x DBH2 between the plots, there were no differences in the critical turning moments. This result suggested that P. thunbergii at the sea-side had acclimated for 50 years to their environment by changing shallow tap roots for shallower belowground water and developing horizontal roots for strong winds. The depth of the center point of rotation was significantly deeper and was positively correlated with moments in the land-side plot, suggesting changes from a tap root system to a plate root system in the sea-side plot with a shallower water table. The estimated loading from the tsunami with a 2 m wave height was over the critical turning moments for both plots. P. thunbergii trees at the sea-side plot could be more susceptible to overturning by lower-height waves than at the land-side plot because of differences in aboveground traits of H x DBH. We propose that the practical management of coastal forests is to create an embankment by raising the ground level to develop tree growth with capable of enhanced resilience to tsunamis.

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  31. Free-living nematodes associated with pine cones of Pinus thunbergii and P. taeda at Japanese coastal and inland forest sites Reviewed

    Yudai Kitagami, Natsumi Kanzaki, Toko Tanikawa, Yosuke Matsuda

    Nematology   Vol. 21 ( 4 ) page: 389 - 400   2019

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    <title>Summary</title>
    We surveyed the distribution of nematodes in 56 cones of <italic>Pinus thunbergii</italic> collected from both live branches and on the forest floor in three coastal and inland habitats and in 11 cones of <italic>P. taeda</italic> collected at different heights. We identified 47 nematodes to family or genera by analysis of an 18S small subunit rRNA gene sequence. The frequencies of occurrence of free-living cone nematodes were 97% in coastal <italic>P. thunbergii</italic>, 92% in inland <italic>P. thunbergii</italic>, and 82% in <italic>P. taeda</italic>. Phylogenetic analysis assigned the nematodes to four clades with high bootstrap values. Nine sequences that were found only in cones on live branches were clustered with <italic>Panagrobelus stammeri</italic> and an unknown <italic>Panagrobelus</italic> sp. Our results imply that nematodes are commonly associated with cones in pine forest ecosystems and that a capacity for anhydrobiosis may be a key to surviving above-ground.

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  32. Ground-penetrating radar estimates of tree root diameter and distribution under field conditions Reviewed

    Keitaro Yamase, Toko Tanikawa, Masako Dannoura, Mizue Ohashi, Chikage Todo, Hidetoshi Ikeno, Kenji Aono, Yasuhiro Hirano

    TREES-STRUCTURE AND FUNCTION   Vol. 32 ( 6 ) page: 1657 - 1668   2018.12

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    Key messageUse of ground-penetrating radar (GPR) can non-destructively estimate diameter and distribution of coarse roots in Cryptomeria japonica in weathered granite soils under field conditions.AbstractGround-penetrating radar (GPR) has been used as an assessment tool for non-destructive detection of tree root biomass, but few studies have estimated root diameter under forest field conditions. The aim of this study was to clarify whether coarse root diameter of C. japonica in weathered granite soils can be estimated using GPR in a forest. Roots of mature C. japonica were scanned using a 900MHz GPR antenna before being excavated. The diameter and distribution of excavated roots were compared with those identified by GPR, and the relationships between the diameter and waveform indices in radar profiles were also examined. The detection frequency of the number of roots larger than 5mm in diameter was 47.7%. Limiting factors affecting root detection using GPR in forest field conditions were small root diameter, increasing root depth, and number of adjacent roots. Only one waveform index, using the sum of time intervals between zero crossings (sigma T, ns) of all reflection waveforms of GPR within the range from the first break time at the root top to the delay point time at the root bottom, had a significant relationship with excavated root diameters. A linear regression model was constructed to estimate root diameter using sigma T, and a significant positive relationship in diameter between GPR-estimated and excavated roots was confirmed. The results in this study indicate that the diameter and distribution of C. japonica coarse roots under forest field conditions could be estimated using GPR and this technique could contribute to future evaluation of slope stability by evaluating tree roots under vulnerable soils, such as weathered granite.

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  33. Nematode communities in pine forests are shaped by environmental filtering of habitat conditions Reviewed

    Kitagami Yudai, Tanikawa Toko, Mizoguchi Takeo, Matsuda Yosuke

    JOURNAL OF FOREST RESEARCH   Vol. 23 ( 6 ) page: 346 - 353   2018.11

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    Soil nematodes are involved in nutrient cycles through feeding on microorganisms, and the extent of their functioning is affected by subtle environmental changes and by biological interactions. Considering these features, soil nematodes can serve as bio-indicators reflecting environmental changes in a given ecosystem. However, the mechanism of shaping community structures of nematodes is not well understood due to the complex biological interactions in forest ecosystems. The aim of this study was to clarify the nematode communities and their determinant factors in both coastal and inland Pinus thunbergii forests of central Japan under contrasting environmental conditions. For this purpose, nematodes retrieved from soil samples were morphologically identified at generic levels and discriminated into trophic groups. We also determined whether nematode community structures varied with coastal or inland locations based on non-metric multidimensional scaling. Our results showed that generic richness of nematode at inland habitats (16.2 +/- 0.7, mean +/- SE) was significantly greater than that at coastal habitats (12.4 +/- 0.4). Moreover, the non-metric multidimensional scaling scatter-plot showed nematode communities clustered significantly within their respective coastal and inland habitats. These clusterings were further significantly influenced by surrounding environmental factors; soil water content, soil temperature, litter layer thickness, pH, total both N and C concentrations and C:N ratio. For characteristic trophic groups, microbial-feeding nematodes were represented in coastal forests while predaceous ones were dominated in inland forests. Our study provided fundamental knowledge on the formation of nematode community structures that were shaped by environmental filtering.

    DOI: 10.1080/13416979.2018.1516920

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  34. Nematode communities in pine forests are shaped by environmental filtering of habitat conditions. Invited Reviewed

    Kitagami, Y., Tanikawa, T., Mizoguchi, T., Matsuda, Y.

    Journal of Forest Research   Vol. 23   page: 346 - 353   2018.9

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    DOI: https://doi.org/10.1080/13416979.2018.1516920

  35. Correction to: Quantification of the contrasting root systems of Pinus thunbergii in soils with different groundwater levels in a coastal forest in Japan (Plant and Soil, (2018), 426, 1-2, (327-337), 10.1007/s11104-018-3630-9) Reviewed

    Yasuhiro Hirano, Chikage Todo, Keitaro Yamase, Toko Tanikawa, Masako Dannoura, Mizue Ohashi, Ryuusei Doi, Ryusei Wada, Hidetoshi Ikeno

    Plant and Soil   Vol. 427 ( 1-2 ) page: 393 - 394   2018.6

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    © 2018, Springer International Publishing AG, part of Springer Nature. The original version of this article unfortunately contained a mistake. Table 3 was published erroneously. This Table has now been corrected.

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  36. Quantification of the contrasting root systems of Pinus thunbergii in soils with different groundwater levels in a coastal forest in Japan Reviewed

    Yasuhiro Hirano, Chikage Todo, Keitaro Yamase, Toko Tanikawa, Masako Dannoura, Mizue Ohashi, Ryuusei Doi, Ryusei Wada, Hidetoshi Ikeno

    Plant and Soil   Vol. 426 ( 1-2 ) page: 327 - 337   2018.5

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    © 2018, Springer International Publishing AG, part of Springer Nature. Aims: The different root systems of Pinus thunbergii observed after the tsunami in 2011 were possibly influenced by different groundwater levels before the tsunami. The aims of this study were to quantify the tap and horizontal root structure and evaluate their relationship with the above-ground parts under different groundwater levels in a coastal P. thunbergii forest. Methods: Two plots, sea- and land-side, with different groundwater levels, in a P. thunbergii stand, were established, and the entire root-systems of three select trees each were harvested to evaluate the biomass, lengths, and cross-sectional areas of the tap and horizontal roots. Results: In the sea-side plot, which had a shallower groundwater level, plate root systems with thicker and longer horizontal roots, but fewer tap roots were observed, whereas tap root systems were well developed in the land-side plots, where the groundwater level was deeper. The root-to- shoot ratio was significantly higher in the sea-side plot than in the land-side plot. Conclusion: We confirmed that quantitative contrasting root systems of P. thunbergii develop under different groundwater levels and higher biomass allocation to horizontal roots occur under shallower groundwater depths, emphasizing the need for management practices that promote the development of tap root systems to enhance resistance to tsunamis.

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  37. Sulfur accumulation rates in volcanic soils of eastern Japan over the last millennium based on tephrochronology Reviewed

    Tanikawa, T., Hashimoto, Y., Yamaguchi N., Takahashi M., Yoshinaga S.

    Geoderma   Vol. 315   page: 111 - 119   2018.4

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    DOI: https://doi.org/10.1016/j.geoderma.2017.11.023

  38. Sulfur accumulation rates in volcanic soils of eastern Japan over the last millennium based on tephrochronology Reviewed

    Toko Tanikawa, Yohey Hashimoto, Noriko Yamaguchi, Masamichi Takahashi, Shuichiro Yoshinaga

    Geoderma   Vol. 315   page: 111 - 119   2018.4

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    Soils have an important role as a reservoir of essential elements for forest ecosystems. Although previous chronosequence studies have determined accumulation rates of several elements in soils, they have not focused on sulfur (S), a secondary macronutrient. We investigated S accumulation rates in five volcanic soils, dated by the use of tephras from the following volcanoes: Mt. Komagatake (tephra Ko-a, 1929 CE), Mt. Tarumae (tephra Ta-a, 1739 CE), Mt. Fuji (tephra F-Ho, 1707 CE), Towada caldera (tephra To-a, 915 CE), and Mt. Haruna (tephra Hr-FP520, 520 CE). The soils were sampled from A horizons formed above the tephra layer, and total S and pedogenic minerals (Ald, Fed, Alo, and Feo) were analyzed to determine the relationships between their estimated pools and soil age. The fractionation of S by oxidation state was determined by S K-edge XANES analysis in constituents of soils from Mt. Komagatake and Mt. Haruna. Our results showed that the S accumulation rate was almost constant over the last millennium. To extend our analysis to longer soil formation times, we extrapolated the S accumulation–age relationship to 10 cal. ka and compared the resulting values with previously reported S data from horizons that likely developed during that time period in soils from Mt. Nantai dated by tephra Nt-S (14–15 cal. ka). The similarity of the extrapolated values to the Nantai soil values suggests that the S accumulation rate may have been constant since 10 cal. ka. In addition, the growth of the S pool with soil age was linearly proportional to the growth of pedogenic mineral pools. Sulfur isotope composition of soil total S depended not on soil age, but rather on the soil origin as indicated by location. The predominant oxidation state of the S fraction changed from reduced to oxidized with soil age during the Holocene. These results suggest that the constant S accumulation rate may reflect the variable influence of exogenous S sources as well as the association of S compounds with pedogenic minerals. Sulfur compounds may accumulate at a constant rate in Japanese volcanic soils as the result of biological transformation followed by retention of S in association with the pedogenic minerals.

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  39. Relationships between specific root length and respiration rate of fine roots across stands and seasons in Chamaecyparis obtusa Reviewed

    Kouhei Miyatani, Toko Tanikawa, Naoki Makita, Yasuhiro Hirano

    PLANT AND SOIL   Vol. 423 ( 1-2 ) page: 215 - 227   2018.2

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    Fine root respiration (R (r) ) is closely linked with fine root morphology, especially with specific root length (SRL), in short-term measurements in some tree species. However, whether these relationships are also valid across different stands and seasons is not yet known. This study aimed to investigate these relationships in the fine roots of Chamaecyparis obtusa.The R (r) , mean root diameter, and SRL of fine root segments of two C. obtusa stands were determined every three months over two years.We detected significant positive correlations between R (r) and SRL of fine root segments across the stands over two years. The relationship of R (r) with SRL was stronger than that with the mean diameter of fine roots. The slopes and intercepts for the R (r) and SRL relationships did not differ among stands and measurement times. Further, we proposed a simple approach for estimating CO2 flux from fine roots at the stand level based on SRL and confirmed that the ranges of estimated CO2 values were comparable with those of values reported using the conventional approach.The fine root morphology typified by SRL is a key variable in R (r) of fine roots and CO2 flux at the stand level.

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  40. Calcium is cycled tightly in Cryptomeria japonica stands on soils with low acid buffering capacity Reviewed

    Toko Tanikawa, Yoshiaki Ito, Sei Fukushima, Michiru Yamashita, Akifumi Sugiyama, Takeo Mizoguchi, Toru Okamoto, Yasuhiro Hirano

    FOREST ECOLOGY AND MANAGEMENT   Vol. 399   page: 64 - 73   2017.9

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    Calcium (Ca) is a key cation in the soil acidification process and in the fertility of forest soils. We investigated total concentrations of Ca, magnesium (Mg), and potassium (K) in both soil and fresh leaf litter in eight plantation stands of Cryptomeria japonica divided into two groups of highly contrasting soil acid buffering capacity (ABC). In addition to conventional methods, we used a double-crystal high resolution X-ray fluorescence (HRXRF) spectrometer to determine Ca fractions in soils with low and high ABC. Total Ca had accumulated in the 0-10 cm depth horizons of the high-ABC soils, but not in the low-ABC soils. The exchangeable Ca concentration was correlated with total Ca concentration in the 0-10 cm depth of the low-ABC soils. Calcium-K alpha(1,2) emission spectra of the 0-10 cm soils obtained by HRXRF spectrometry separated the total Ca into two fractions, suggesting that the predominant Ca constituents had either passed through biological processes or were derived from weathering hydration in both the high- and low-ABC soils. Calcium concentration in the fresh leaf litter was significantly lower in the stands with low-ABC soil than in those with high-ABC soil and was positively correlated with soil exchangeable Ca concentration in the low-ABC stands; no such correlation was observed in the high-ABC stands. Exchangeable Ca pools in the 0-10 cm depth range were equal to or less than the annual input of Ca via leaf litterfall in the low-ABC stands, but were seven times the annual input in the high-ABC soils. These results suggested that the accumulation of Ca in the upper soil occurs via the process of Ca circulation within C. japonica ecosystems, and that sufficient supply of Ca for tree needs was accompanied by the large accumulation of available Ca by C. japonica in the high-ABC soils. Nevertheless, it is likely that only small amounts of Ca were circulated in the stands on low-ABC soil. The lack of Ca accumulation in the surface soil and the accompanying tight circulation of Ca in the plant-soil system may explain the observed positive feedback in which ABC is gradually reduced in low-ABC soils. (C) 2017 Elsevier B.V. All rights reserved.

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  41. Intraspecific variation in morphological traits of root branch orders in Chamaecyparis obtusa Reviewed

    Ryuusei Doi, Toko Tanikawa, Kouhei Miyatani, Yasuhiro Hirano

    PLANT AND SOIL   Vol. 416 ( 1-2 ) page: 503 - 513   2017.7

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    We aimed to clarify the intraspecific variation in the morphological traits of branch orders under different soil conditions in Chamaecyparis obtusa (Siebold & Zucc.) Endl.
    We investigated the morphological traits of branch orders, based on 16,351 individual roots that were dissected from 12 intact fine root systems, up to a diameter of 2 mm at three C. obtusa stands. We also measured the concentrations of soil carbon, nitrogen, and inorganic nitrogen.
    The intact fine root systems up to the diameter of 2 mm had branched into between five and seven orders. The diameter of first- to fourth-order roots and the lengths of second- and third-order roots were significantly different among the three stands. The morphological traits of lower order (first to third) roots correlated with soil inorganic nitrogen concentrations, but higher order (fourth to sixth) roots correlated with soil carbon concentrations.
    We clarified the possible ranges of intraspecific variation in the morphological traits of root branch orders within C. obtusa. Both the lower and higher orders of the intact fine root systems were tightly related to the surrounding soil conditions.

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  42. Calculation procedures to estimate fine root production rates in forests using two-dimensional fine root data obtained by the net sheet method Reviewed

    Kyotaro Noguchi, Toko Tanikawa, Yoshiyuki Inagaki, Shigehiro Ishizuka

    TREE PHYSIOLOGY   Vol. 37 ( 6 ) page: 697 - 705   2017.6

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    Several recent studies have used the net sheet method to estimate fine root production rates in forest ecosystems, wherein net sheets are inserted into the soil and fine roots growing through them are observed. Although this method has advantages in terms of its easy handling and low cost, there are uncertainties in the estimates per unit soil volume or unit stand area, because the net sheet is a two-dimensional material. Therefore, this study aimed to establish calculation procedures for estimating fine root production rates from two-dimensional fine root data on net sheets. This study was conducted in a hinoki cypress (Chamaecyparis obtusa (Sieb. & Zucc.) Endl.) stand in western Japan. We estimated fine root production rates in length and volume from the number (RN) and cross-sectional area (RCSA) densities, respectively, for fine roots crossing the net sheets, which were then converted to dry mass values. For these calculations, we used empirical regression equations or theoretical equations between the RN or RCSA densities on the vertical walls of soil pits and fine root densities in length or volume, respectively, in the soil, wherein the theoretical equations assumed random orientation of the growing fine roots. The estimates of mean fine root (diameter &lt;1 mm) production rates were similar to 80-100 gm(-2) year(-1) using the empirically obtained regression equations, whereas those from the theoretical equations were similar to 40-50 gm(-2) year(-1). The difference in the estimates was attributed to larger slope values of the empirical regression equations than those of the theoretical equations, suggesting that fine root orientation was not random in our study site. In light of these results, we concluded that fine root production rates were successfully estimated from two-dimensional fine root data on the net sheets using these calculation procedures, with the empirical regression equations reflecting fine root orientation in the study site.

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  43. Biomass and morphology of fine roots in eight Cryptomeria japonica stands in soils with different acid-buffering capacities Reviewed

    Yasuhiro Hirano, Toko Tanikawa, Naoki Makita

    FOREST ECOLOGY AND MANAGEMENT   Vol. 384   page: 122 - 131   2017.1

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    Cryptomeria japonica, which is one of the main silvicultural species in Japan, accumulates calcium (Ca) in soils with high acid buffering capacity (ABC) but has depleted Ca in soils with low-ABC over the past two decades. However, the contribution of fine roots in C japonica to the accumulation or depletion of Ca in soils with different ABCs has not been evaluated. The aim of this study was to clarify the responses of C. japonica fine roots in terms of biomass and morphology in eight plantation stands to soils with two contrasting ABCs, which have different trends of soil acidification. We evaluated the biomass and specific root length (SRL) of fine roots divided into three diameter classes (&lt;0.5, 0.5-1.0, and 1.0-2.0 mm), obtained from the organic layer and two mineral soil layers from 0 to 10 and 10 to 20 cm depths, in soils with high- and low-ABCs. We also investigated root traits of seedlings grown in soil monoliths in-situ in a greenhouse condition to compare the response of mature trees in stands. The biomass of fine roots (&lt;2.0 mm) in mature C japonica was significantly higher and the SRL was significantly lower in low ABC soils than in high-ABC soils. In the organic layer, the biomass of very fine roots (&lt;0.5 mm) at the organic soil layer in low ABC soils was higher than that in high ABC soils. However, the SRL and the dry weight of the seedlings in the greenhouse condition showed no differences between the soils with two contrasting ABCs. We concluded that fine roots of C japonica stands could have changed and contributed differently to soils with contrasting ABCs. The conflicting root responses of mature trees in stand and seedlings under controlled conditions suggest that careful caution should be taken to extrapolate in situ mature trees from the results of seedlings, particularly when evaluating the effects of soil degradation such as soil acidifications on sustainable C. japonica plantation forests. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.foreco.2016.10.043

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  44. Ungulates decelerate litter decomposition by altering litter quality above and below ground. Reviewed

    Kasahara, M., Fujii, S., Tanikawa, T., & Mori, A. S.

    European Journal of Forest Research   Vol. 135 ( 5 ) page: 849 - 856   2016.7

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  45. Leaf litter thickness, but not plant species, can affect root detection by ground penetrating radar. Reviewed

    Tanikawa, T., Ikeno, H., Dannoura, M., Yamase, K., Aono, K., & Hirano, Y.

    Plant and Soil   Vol. 408 ( 1-2 ) page: 271 - 283   2016.5

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    DOI: https://doi.org/10.1007/s11104-016-2931-0

  46. Fine root traits in Chamaecyparis obtusa forest soils with different acid buffering capacities. Reviewed

    Miyatani, K., Mizusawa, Y., Okada, K., Tanikawa, T., Makita, N., & Hirano, Y.

    Trees   Vol. 30 ( 2 ) page: 415 - 429   2015.10

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  47. Intraspecific variation in fine root respiration and morphology in response to in situ soil nitrogen fertility in a 100-year-old Chamaecyparis obtusa forest. Reviewed

    Makita, N., Hirano, Y., Sugimoto, T., Tanikawa, T., & Ishii, H.

    Oecologia   Vol. 179 ( 4 ) page: 959 - 967   2015.8

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  48. Calibrating the impact of root orientation on root quantification using ground-penetrating radar. Reviewed International coauthorship

    Guo, L., Wu, Y., Chen, J., Hirano, Y., Tanikawa, T., Li, W., & Cui, X.

    Plant and Soil   Vol. 395 ( 1-2 ) page: 289 - 305   2015.6

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    Language:English   Publishing type:Research paper (scientific journal)  

  49. 同心円状レーダ探索による海岸に生育するクロマツ個体の水平根の広がりの検出 Reviewed

    大橋瑞江, 柿添哲也, 池野英利, 山瀬敬太郎, 谷川東子, 檀浦正子, 青野健治, 藤堂千景, 平野恭弘

    日本緑化工学会誌   Vol. 41   page: 385 - 390   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  50. 間伐がスギの最大引き倒し抵抗モーメントにもたらす影響 Reviewed

    日本緑化工学会誌   Vol. 41   page: 308 - 314   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  51. 異なる土壌環境下における根系構造と引き抜き抵抗力との関係 Reviewed

    山瀬敬太郎, 谷川東子, 池野英利, 藤堂千景, 大橋瑞江, 檀浦正子, 平野恭弘

    日本緑化工学会誌   Vol. 41   page: 301 - 307   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  52. 減災の観点から樹木根系を非破壊的に推定する地中レーダ法の現状と課題 Reviewed

    平野恭弘, 山瀬敬太郎, 谷川東子, 檀浦正子, 大橋瑞江, 藤堂千景, 池野英利

    日本緑化工学会誌   Vol. 41   page: 319 - 325   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  53. Sulfur accumulation in Melanudands during development by upbuilding pedogenesis since 14–15cal. ka. Reviewed

    Tanikawa T, Hashimoto Y, Yamaguchi N, Ito Y, Fukushima S, Kanda K, Uemura M, Hasegawa T, Takahashi M, Yoshinaga S

    Geoderma   Vol. 232   page: 609 - 618   2014.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  54. Sequential transformation rates of soil organic sulfur fractions in two-step mineralization process. Reviewed

    Tanikawa T, Noguchi K, Nakanishi K, Shigenaga H, Nagakura J, Sakai H, Akama A, Takahashi M

    Biology and fertility of soils   Vol. 50 ( 2 ) page: 225 - 237   2014

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  55. Reply to:“Comment on root orientation can affect detection accuracy of ground-penetrating radar” Reviewed

    Tanikawa, T., Dannoura, M., Yamase, K., Ikeno, H., & Hirano, Y.

    Plant and soil   Vol. 380 ( 1-2 ) page: 445 - 450   2014

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  56. Root orientation can affect detection accuracy of ground-penetrating radar. Reviewed

    Tanikawa T., Hirano Y., Dannoura M., Yamase K., Aono K., Ishii M., Igarashi T., Ikeno H., & Kanazawa Y.

    Plant and soil   Vol. 373 ( 1-2 ) page: 317 - 327   2013.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  57. Soil sulfur content and its spatial distribution in a small catchment covered by volcanic soil in the montane zone of central Japan. Reviewed

    Tanikawa T., Yamashita N., Aizawa S., Ohnuki Y., Yoshinaga S., & Takahashi M.

    Geoderma   Vol. 197   page: 1 - 8   2013.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  58. Highly accumulated sulfur constituents and their mineralogical relationships in Andisols from central Japan. Reviewed

    Tanikawa T., Takahashi M., Imaya A., Ishizuka K.

    Geoderma   Vol. 151 ( 1 ) page: 42 - 49   2009.6

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  59. 奥日光の森林衰退地域の樹木生葉と土壌の養分特性-他の亜高山地域との比較から- Reviewed

    谷川東子・高橋正通・野口享太郎・重永英年・長倉淳子・酒井寿夫・石塚和裕・赤間亮夫

    環境科学会誌   Vol. 22   page: 401 - 414   2009

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  60. 森林土壌における硫黄化合物の蓄積実態 Invited Reviewed

    谷川東子・高橋正通・今矢明宏

    環境科学会誌   Vol. 17   page: 211 - 215   2004

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  61. 森林生態系における硫黄の循環と土壌の硫黄集積機構の意義 ―土壌の硫黄蓄積とその理化学性との関係― Invited Reviewed

    谷川東子・高橋正通・今矢明宏

    地球環境   Vol. 9   page: 19 - 28   2004

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    Authorship:Lead author, Corresponding author   Language:Japanese  

  62. アンディソルとインセプティソルにおける硫酸イオンの土壌断面分布と現存量 ―吸着態および溶存態硫酸イオンについて― Reviewed

    谷川東子・高橋正通・今矢明宏・稲垣善之・石塚和裕

    日本土壌肥料学雑誌   Vol. 74   page: 149 - 155   2003

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  63. 落葉広葉樹林におけるN2O生成とその空間的異質性. Reviewed

    石塚成宏・阪田匡司・谷川東子・石塚和裕

    日本林学会誌   Vol. 82   page: 62 - 71   2000

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  64. Extractable sulfate content in Japanese forest soils Reviewed

    Tanikawa, T., Ishizuka, K., & Imaya, A.

    Journal of Forest Research   Vol. 4   page: 191 - 194   1999

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  65. Relating sulfate adsorption to soil properties in Japanese forest soils. Reviewed

    Journal of Forest Research   Vol. 4   page: 217 - 222   1999

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  66. 異なる森林土壌中における硫酸イオンの吸着 ―有機物による吸着阻害― Invited Reviewed

    谷川東子・竹中千里

    日本林学会論文集   Vol. 105   page: 415 - 416   1994

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    Authorship:Lead author, Corresponding author   Language:Japanese  

  67. 土壌中における硫酸イオンの吸着 Reviewed

    谷川東子・竹中千里

    日本林学会中部支部論   Vol. 42   page: 125 - 126   1994

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    Language:Japanese  

▼display all

Books 6

  1. 森の根の生態学

    谷川東子( Role: Contributor ,  樹木根の土壌化)

    共立出版  2020.12  ( ISBN:4320058135

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    Language:Japanese Book type:Scholarly book

  2. 森林のバランス

    谷川東子( Role: Contributor ,  イオウの循環)

    東海大学出版会  2012 

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    Responsible for pages:250-258   Language:Japanese

  3. 森林大百科事典

    谷川東子( Role: Contributor ,  森林土壌と酸性環境負荷)

    朝倉書店  2009 

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    Responsible for pages:79-81   Language:Japanese Book type:Dictionary, encyclopedia

  4. 世界の土壌資源-入門-

    松田東子( Role: Joint translator ,  ルビソル (LUVISOLS))

    古今書院  2002 

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    Language:Japanese Book type:Textbook, survey, introduction

  5. 世界の土壌資源-アトラス-

    松田東子( Role: Joint translator ,  ルビソル (LUVISOLS))

    古今書院  2002 

  6. 森の根の生態学 = Root ecology of forest trees

    平野, 恭弘, 野口, 享太郎, 大橋, 瑞江( Role: Contributor ,  樹木根の土壌化)

    共立出版  2020.12  ( ISBN:9784320058132

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    Total pages:xii, 352p   Language:Japanese

    CiNii Books

▼display all

MISC 1

  1. NaCl処理がクロマツ実生に形成されたCenococcum geophilum菌根の細胞外酵素活性に及ぼす影響

    山口郷彬, 谷川東子, 小長谷啓介, 松田陽介

    中部森林研究   ( 67 ) page: 51‐52   2019.5

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    Language:Japanese  

    J-GLOBAL

Presentations 57

  1. 肥沃でもなく酸性化も進んでいない土壌の20年後の姿

    西村澪・伊藤嘉昭・福島整・山下満・矢崎一史・杉山暁史・平野恭弘

    第426回生存圏シンポジウム  2021.3.2 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

  2. スギ・ヒノキ細根系の次数別形態特性の比較

    土居龍成・谷川東子・和田竜征・平野恭弘

    第136回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  3. SfM を使用した樹木根系構造の三次元再構成と形態計測

    岡本祐樹・大橋瑞江・平野恭弘・谷川東子・山瀬敬太郎・藤堂千景・檀浦正子・池野英利

    第136回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  4. 細根バイオマス傾斜を持つ森林間での土壌の有機金属複合体存在比の比較

    林亮太・和穎朗太・平野恭弘・溝口岳男・谷川東子

    第136回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  5. ヒノキ細根は細根系のどの位置でどれくらい脱落するのか?

    吉田厳・土居龍成・和田竜征・谷川東子・平野恭弘

    第136回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  6. 本州中部のスギ細根から検出したアーキアの群集構造

    峰太一郎・北上雄大・谷川東子・松田陽介

    第135回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  7. 愛知海上の森における地質の違いがヒノキ林の成長と表層土壌に与える影響

    杁山哲矢・谷川東子・土居龍成・西村 澪・吉江凜平・林亮太・千葉尚哉・平野恭弘

    第134回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Poster presentation  

  8. スギ・ヒノキ林における表層土壌酸性化の 30 年間の進行・抑制

    西村澪・谷川東子・土居龍成・吉田 厳・杁山哲矢・岡本透・平野恭弘

    第133回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  9. 二周波地中レーダを用いた高深度解析による海岸林クロマツの根系構造推定

    池野英利・澤志 萌・平野恭弘・藤堂千景・山瀬敬太郎・谷川東子・檀浦正子・大橋瑞江

    第132回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  10. 森林の物質循環における樹木根の役割 Invited

    野口享太郎・牧田直樹・福澤加里部・檀浦正子・谷川東子・藤井佐織

    第132回日本森林学会大会  2021.3 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

  11. 人工林において植物―土壌間相互作用が作り出す土壌生態系 Invited

    谷川東子

    第6回名大・岐大農学シンポジウム  2021.2.1  名古屋大学・岐阜大学

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    Event date: 2021.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  12. Regional-scale analysis of rhizosphere bacterial community in Cryptomeria japonica plantations

    OBASE Keisuke, MINE Taichiro, KITAGAMI Yudai, TANIKAWA Toko, CHEN Chien-Fan, MATSUDA Yosuke

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  13. 細根バイオマス傾斜を持つ森林間での土壌の有機金属複合体存在比の比較

    林亮太, 和穎朗太, 平野恭弘, 溝口岳男, 谷川東子

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  14. 森林の物質循環における樹木根の役割

    野口享太郎, 牧田直樹, 福澤加里部, 檀浦正子, 谷川東子, 藤井佐織

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  15. 本州中部のスギ細根から検出したアーキアの群集構造

    峰太一郎, 北上雄大, 谷川東子, 松田陽介

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  16. 愛知海上の森における地質の違いがヒノキ林の成長と表層土壌に与える影響

    杁山哲矢, 谷川東子, 土居龍成, 西村澪, 吉江凜平, 林亮太, 千葉尚哉, 平野恭弘, 平野恭弘

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  17. 二周波地中レーダを用いた高深度解析による海岸林クロマツの根系構造推定

    池野英利, 澤志萌, 平野恭弘, 藤堂千景, 藤堂千景, 山瀬敬太郎, 谷川東子, 檀浦正子, 大橋瑞江

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  18. ヒノキ細根は細根系のどの位置でどれくらい脱落するのか?

    吉田厳, 土居龍成, 和田竜征, 谷川東子, 平野恭弘

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  19. スギ・ヒノキ細根系の次数別形態特性の比較

    土居龍成, 谷川東子, 和田竜征, 平野恭弘

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  20. スギ・ヒノキ林における表層土壌酸性化の30年間の進行・抑制

    西村澪, 谷川東子, 土居龍成, 吉田厳, 杁山哲矢, 岡本透, 平野恭弘, 平野恭弘

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  21. SfMを使用した樹木根系構造の三次元再構成と形態計測

    岡本祐樹, 大橋瑞江, 平野恭弘, 谷川東子, 山瀬敬太郎, 藤堂千景, 藤堂千景, 檀浦正子, 池野英利

    日本森林学会大会学術講演集  2021 

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    Event date: 2021

  22. 表層土壌におけるヒノキ細根の脱落過程について

    吉田厳・土居龍成・和田竜征・谷川東子・平野恭弘

    第 52 回根研究集会  2020.11 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Poster presentation  

  23. レーダ画像解析による海岸性クロマツの根系構造の推定

    澤志萌・池野英利・平野恭弘・藤堂千景・山瀬敬太郎・谷川東子・檀浦正子・大橋瑞江

    第 52 回根研究集会  2020.11 

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    Event date: 2020.11

  24. 岐阜県大湫町神明神社の大杉倒木の根系状況

    平野恭弘・南光一樹・土居龍成・西村澪・杁山哲矢・谷川東子

    第 52 回根研究集会  2020.11 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Poster presentation  

  25. VisualSfM による根系三次元構造の再構築

    岡本祐樹 ・大橋瑞江・平野恭弘・谷川東子・山瀬敬太郎・藤堂千景・檀浦正子・池野英利

    第 52 回根研究集会  2020.11.21 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

  26. 葉と根の分解により放出される水溶性成分と菌叢遷移とのかかわり

    谷川東子・眞家永光・平野恭弘・溝口岳男・藤井佐織・松田陽介

    日本土壌肥料学会2020年度岡山大会  2020.9 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Poster presentation  

  27. 中部日本の森林集水域における河川化学性と大気由来の硫黄の動態 International conference

    佐瀨裕之,高橋正通,松田和秀,佐藤啓市,谷川東子,山下尚之,大泉毅,石田卓也,上迫正人,小林亮,内山重輝,齋藤辰善,諸橋 将雪,福原晴夫,金子真司,井上隆信,山田俊郎,竹中千里,陀安一郎,中野孝教,袴田 共之,太田誠一

    2020.5 

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    Event date: 2020.5

    Language:Japanese   Presentation type:Oral presentation (general)  

  28. Regional-scale analysis of rhizosphere bacterial community in Cryptomeria japonica plantations International coauthorship

    Keisuke Obase・Taichiro Mine・Yudai Kitagami・ Toko Tanikawa・Chien-Fan Chen・Yosuke Matsuda

    2020.3.19 

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    Event date: 2020.3

    Language:English   Presentation type:Poster presentation  

  29. ヒノキ細根は細根系内のどの位置で脱落するのか?

    吉田厳, 土居龍成, 和田竜征, 谷川東子, 平野恭弘

    日本森林学会大会学術講演集  2020 

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    Event date: 2020

  30. Morphological traits of lower order root at different branch position within fine root system up to 2 mm in diameter

    土居龍成, 谷川東子, 吉田厳, 西村澪, 平野恭弘

    日本生態学会大会講演要旨(Web)  2020 

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    Event date: 2020

  31. 土壌窒素が異なるヒノキ2林分の樹幹からの距離に応じた細根次数形態特性

    土居龍成, 谷川東子, 吉田厳, 西村澪, 平野恭弘

    日本森林学会大会学術講演集  2020 

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    Event date: 2020

  32. 二周波アンテナ同時探査可能な地中レーダを用いた樹木根系検出

    平野恭弘, 谷川東子, 藤堂千景, 藤堂千景, 山瀬敬太郎, 土居龍成, 吉田厳, 西村澪, 澤志萌, 池野英利

    日本森林学会大会学術講演集  2020 

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    Event date: 2020

  33. Effects of different applications on enzymatic activity of ectomycorrhizas of Japanese black pine seedlings planted at a coastal area International conference

    Yamaguchi S, Tanikawa T, Obase K, Matsuda Y

    Asian Mycological Congress 2019 (AMC 2019) 

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    Event date: 2019.10

    Language:English   Presentation type:Poster presentation  

    Venue:Mie   Country:Japan  

  34. Arbuscular mycorrhizal communities at different root orders collected at Japanese cedar forests in the central Japan International conference

    Matsuda Y, Kita K, Kitagami Y, Tanikawa T

    Tenth International Conference on Mycorrhiza (ICOM10) 

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    Event date: 2019.6 - 2019.7

    Language:English   Presentation type:Poster presentation  

    Country:Mexico  

  35. Is depth at the center point of rotation in tree pulling experiments an indicator of the root depth?

    Todo Chikage, Yamase Keitaro, Ohashi Mizue, Ikeno Hidetoshi, Tanikawa Toko, Hirano Yasuhiro

    The Japanese Forest Society Congress  2019  THE JAPANESE FORESTRY SOCIETY

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    Event date: 2019

    Language:Japanese  

    <p>[in Japanese]</p>

  36. Stability and root system structure of <i>Pinus thunbergii </i> in soils with different groundwater levels in a coastal forest

    Hirano Yasuhiro, Todo Chikage, Tanikawa Toko, Dannoura Masako, Ohashi Mizue, Tokoro Chie, Doi Ryuusei, Ikeno Hidetoshi

    The Japanese Forest Society Congress  2019  THE JAPANESE FORESTRY SOCIETY

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    Event date: 2019

    Language:Japanese  

    <p>[in Japanese]</p>

  37. 海岸クロマツ林の根系は石礫層でも成長速度を維持している

    谷川東子, 安江恒, 松田陽介, 池野英利, 藤堂千景, 山瀬敬太郎, 大橋瑞江, 檀浦正子, 平野恭弘

    日本土壌肥料学会2021年度北海道大会  2021.9 

  38. 海岸クロマツ林の根系が硬い土壌層を突き抜けるためにかかる時間の推定

    谷川東子, 安江恒, 池野英利, 藤堂千景, 山瀬敬太郎, 大橋瑞江, 檀浦正子, 松田陽介, 平野恭弘

    第53回根研究集会  2021.6.5 

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    Presentation type:Oral presentation (general)  

  39. Relationship between the shape of woody roots and pulling resistance: model experiment using 3D printer

    Tanigawa Mio, Ikeno Hidetoshi, Hirano Yasuhiro, Todo Chikage, Yamase Keitaro, Tanikawa Toko, Dannoura Masako, Ohashi Mizue

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  40. Relationship between the critical turning moment and root system structure on Sugi, Keyaki and Black pine

    Todo Chikage, Ikeno Hidetoshi, Yamase Keitaro, Tanikawa Toko, Ohashi Mizue, Dannoura Masako, Hirano Yasuhiro

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  41. P1-1-17 葉と細根の分解過程で基質から吸収・放出される窒素成分(ポスター,1-1 物質循環・動態,2018年度神奈川大会)

    谷川 東子, 松田 陽介, 平野 恭弘, 溝口 岳男, 藤井 佐織, 眞家 永光

    日本土壌肥料学会講演要旨集  2018 

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    Language:Japanese  

  42. Seasonal dynamics of fine root morphology by branch order at <i>Cryptomeria japonica</i> stands.

    Wada Ryusei, Tanikawa Toko, Doi Ryuusei, Hirano Yasuhiro

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  43. Reconstruction of tree root system based on horizontal root information from bird's-eye view image

    Egawa Kenta, Tomita Takahiro, Ohashi Mizue, Todo Chikage, Yamase keitaro, Tanikawa Toko, Dannoura Masako, Hirano Yasuhiro, Ikeno Hidetoshi

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  44. Carbon lost in the decomposition process of leaves and roots: ratio of respiration and leaching DOM

    Tanikawa Toko, Miyatani Kouhei, Doi Ryuusei, Maie Nagamitsu, Sun Lijuan, Fujii Saori, Matsuda Yosuke, Mizoguchi Takeo, Hirano Yasuhiro

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  45. Comparison of enzymatic activities of <i>Cenococcum geophilum</i> isolates derived from coastal and inland pine forest.

    Yamaguchi Satoaki, Tanikawa Toko, Obase Keisuke, Matsuda Yosuke

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  46. Effects of fungicide treatments on carbon acquisition of mixotrophic <i>Pyrola japonica</i> living on forest floors

    Kawai Shosei, Tanikawa Toko, Uesugi Takashi, Matsuo Naoko, Selosse Marc-André

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  47. Litter and soil nematode communities shaped by soil conditions in artificial Japanese cedar forests, central Japan

    Kitagami Yudai, Tanikawa Toko, Matsuda Yosuke

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  48. Arbuscular mycorrhizal colonizations of Japanese cedar collected at artificial forests in central Japan

    Kita Kohei, TANIKAWA TOKO, MATUDA YOSUKE

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  49. Variations in diameter and length of distal order roots in seven <i>Chamaecyparis obtusa</i> stands

    Doi Ryuusei, Tanikawa Toko, Wada Ryusei, Hirano Yasuhiro

    The Japanese Forest Society Congress  2018 

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    Language:Japanese  

    <p>[in Japanese]</p>

  50. スギ・ヒノキの葉と細根の分解過程で溶出する溶存有機物:蛍光成分組成に着目して

    谷川東子, 藤井佐織, 孫麗娟, 平野恭弘, 宮谷紘平, 土居龍成, 松田陽介, 溝口岳男, 眞家永光

    日本土壌肥料学会講演要旨集  2017.9.5 

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    Language:Japanese  

  51. スギ4林分における細根次数形態と表層土壌化学特性

    和田竜征, 谷川東子, 土居龍成, 平野恭弘, 平野恭弘

    日本森林学会大会学術講演集  2017.3.26 

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    Language:Japanese  

    <p>[in Japanese]</p>

  52. 地中レーダ法を用いたクロマツ根系の検出と再構築

    大橋瑞江, 鬮橋心, 池野英利, 藤堂千景, 山瀬敬太郎, 谷川東子, 檀浦正子, 富田隆弘, 平野恭弘

    日本森林学会大会学術講演集  2017.3.26 

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    Language:Japanese  

    <p>[in Japanese]</p>

  53. 葉と根の分解過程で溶脱するもの―スギヒノキの場合―

    谷川東子, 真家永光, 平野恭弘, 宮谷紘平, 土居龍成, 孫麗娟, 溝口岳男, 藤井佐織

    日本森林学会大会学術講演集  2017.3.26 

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    Language:Japanese  

    <p>[in Japanese]</p>

  54. 異なる土壌環境におけるヒノキ末端次数根形態の変動―東海地方7林分において―

    土居龍成, 谷川東子, 和田竜征, 平野恭弘, 平野恭弘

    日本森林学会大会学術講演集  2017.3.26 

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    Language:Japanese  

    <p>[in Japanese]</p>

  55. 樹木の根鉢と根系構造の関係

    藤堂千景, 山瀬敬太郎, 谷川東子, 大橋瑞江, 池野英利, 檀浦正子, 平野恭弘

    日本森林学会大会学術講演集  2017.3.26 

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    Language:Japanese  

    <p>[in Japanese]</p>

  56. P1-1-8 スギ・ヒノキの葉と細根の分解過程で溶出する溶存有機物:蛍光成分組成に着目して(ポスター,1-1 物質循環・動態,2017年度仙台大会)

    谷川 東子, 藤井 佐織, 孫 麗娟, 平野 恭弘, 宮谷 紘平, 土居 龍成, 松田 陽介, 溝口 岳男, 眞家 永光

    日本土壌肥料学会講演要旨集  2017 

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    Language:Japanese  

  57. スギ・ヒノキを用いた葉と根の分解過程の比較―溶脱炭素量に着目して―

    谷川東子, 平野恭弘, 宮谷紘平, 土居龍成, そんれい娟, 溝口岳男, 藤井佐織

    日本生態学会大会講演要旨(Web)  2017 

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    Language:Japanese  

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Research Project for Joint Research, Competitive Funding, etc. 1

  1. Changes of fertility or acidity during two decades in soils that had neither exchangeable aluminum nor exchangeable base cations.

    2020 - 2020.3

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\210000 ( Direct Cost: \210000 )

KAKENHI (Grants-in-Aid for Scientific Research) 12

  1. 土壌動物の腸内微生物叢から森林の物質循環を読み解く

    Grant number:21K19142  2021.7 - 2024.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    谷川 東子

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    Authorship:Principal investigator 

    Grant amount:\6370000 ( Direct Cost: \4900000 、 Indirect Cost:\1470000 )

  2. 根系構造と根返り耐性特性に基づく海岸林の防災効果向上のための管理手法の提案

    Grant number:21H01600  2021.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    野口 宏典, 小野 賢二, 平野 恭弘, 谷川 東子, 新田 響平

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    Authorship:Coinvestigator(s) 

    東日本大震災からの海岸林の再生では防災効果の向上を念頭に、根を深く発達させるため、盛土を伴う生育基盤が整備された。しかし、従来の土壌とは異なる特性を持つ盛土での植栽木の根系の発達に関する知見は、未だ不十分である。
    本研究では、海岸林のクロマツ及び広葉樹の、成長段階及び異なる生育基盤に応じた根系構造と根返り耐性を解明、さらに、防災効果向上に資する海岸林の管理計画の提案を目的とする。このため、海岸林再生が進む仙台平野の幼齢林、先駆的に広葉樹が導入された秋田県海岸の若齢林と壮齢林で、根系構造と根返り耐性に関する調査を実施し、それらを活用した津波氾濫流の数値実験により、海岸林の管理計画を提案する。

  3. Elucidation of rhizospheric consortium responses to two gradients of climate and soil acidity

    Grant number:21H02232  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s) 

  4. Analyzing and modeling for dynamic mechanism of tree failure caused by strong wind and rain

    Grant number:20H03024  2020.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\1560000 ( Direct Cost: \1200000 、 Indirect Cost:\360000 )

  5. 地上部植生と地中レーダを用いて広葉樹林における根の崩壊防止力を知る

    Grant number:20H03040  2020.4 - 2024.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    山瀬 敬太郎, 谷川 東子, 大橋 瑞江, 堀田 紀文

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\2925000 ( Direct Cost: \2250000 、 Indirect Cost:\675000 )

    森林斜面のうち下流へ雪だるま式に災害を与えかねない、人工密集地に隣接する森林の尾根付近の崩壊発生源に着目し、“地中レーダ+Root Bundleモデル(RBモデル、斜面崩壊防止モデルの一種)”の組み合わせを用いて「根系による崩壊防止力」が脆弱な地域を抽出する。本研究では、単一樹種が対象であったRBモデルを改良し、複数樹種を対象とするVegetationRBモデルの構築を行う。

  6. 海岸クロマツ林の根系が硬い土壌層を 突き抜けるためにかかる時間の推定

    2019.9 - 2021.9

    公益財団法人豊秋奨学会 

    谷川東子 平野恭弘 安江恒

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    Authorship:Principal investigator 

  7. Does increase production of fine root inspired by soil environment impair nutrient retention ability of soil ?

    Grant number:19H03011  2019.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\17420000 ( Direct Cost: \13400000 、 Indirect Cost:\4020000 )

  8. Microbial communities around roots of cypress trees grown under various ranges of acidic soils

    Grant number:18H02237  2018.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\1950000 ( Direct Cost: \1500000 、 Indirect Cost:\450000 )

  9. Understanding of the mechanism of soil acidification driven by fine root dynamics inspired by the soil environment

    Grant number:15H04519  2015.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Tanikawa Toko, Maie Nagamitsu

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    Authorship:Principal investigator 

    Grant amount:\15990000 ( Direct Cost: \12300000 、 Indirect Cost:\3690000 )

    Soils with high acid buffering capacity (ABC) circulated sufficient amounts of calcium (Ca), whereas Ca circulation was tightly regulated in soils with low ABC in C. japonica forest stands. The lack of Ca accumulation in the surface soil might cause further reduction of ABC in the low-ABC soils. Moreover, the biomass of fine roots was significantly higher in low-ABC soils than in high-ABC soils at C. japonica stands. Morphology of fine roots varied among the stands in response to soil environments. Fine root respiration of C. obtusa might be caused by the morphology. An incubation experiment indicated that fine root litter released a greater amount of acidic materials than leaf litter during their decomposition processes. These results suggest that fine root behaviors in response to the soil environment shift soil chemistry.

  10. Understanding plant-soil linkages following large-scale wildfires

    Grant number:15H05250  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Takeda Hiroshi

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    Authorship:Coinvestigator(s) 

    Ongoing climatic warming has triggered large-scale wildfires in many regions, which have a large potential to modify carbon dynamics in terrestrial ecosystems. Vegetation recovery following crown fires is one of the most dominant factor that determine carbon cycling. However, post-fire soil properties have been less focused in terms of their contributions to support plant growth and thus vegetation development. Here, based on intensive field works, , this study aimed to quantify biotic and abiotic properties of soil, including belowground plant materials left after fires, and how they are involved in recovery of post-fire ecosystems.

  11. Non-destructive estimation of tree root system to mitigate natural disaster

    Grant number:25252027  2013.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    HIRANO Yasuhiro

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    Authorship:Coinvestigator(s) 

    Evaluation of development and resistance of tree root system is needed to enhance the effect of mitigation disaster in forest ecosystems. This study aimed to estimate development of root system using ground penetrating radar (GPR) and further to propose the method for estimating root system resistance nondestructively.
    Thickness of leaf litter and angle between root growth and radar scanning are limiting factors for tree root detection using GPR. Development of horizontal root systems in coastal Pinus thunbergii could be estimated using GPR. Plate root systems were found in soils with shallower water table. Critical turning moments were significantly correlated with the depth of root-soil plate. The results in this study can propose a nondestructive method to estimate of root system resistance using estimated root diameter by GPR.

  12. Forest ecosystem functioning of common mycorrhizal network in east Asia

    Grant number:25304026  2013.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Matsuda Yosuke

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    The purpose of this project was to clarify the survival strategy of plants living on the dark forest floor at various forest ecosystems in terms of the underground view of mycorrhizal associations. For this aim, I focused on Pyrola japonica (Ericaceae) that distributes ubiquitously in east Asia. I collected the plants from Japan, Korea and Taiwan, and genetic analysis of the root system was carried out. In the rootsystem, members of Russulaceae that are known to be ectomycorrhizal fungi associating with woody plants taxa. These results suggest that the plants growing on the forest floor retain similar mycorrhizal fungal taxa that are in common with the trees.

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Teaching Experience (On-campus) 7

  1. 生物環境科学科実験実習

    2020

  2. 生命農学序説

    2020

  3. 森林環境学特論

    2020

  4. 情報リテラシー

    2020

  5. 環境問題と人間

    2020

  6. 情報リテラシー

    2019

  7. 生物環境科学科実験実習

    2019

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Social Contribution 13

  1. 地中レーダを使って土の中の根の張りをみる

    Role(s):Lecturer

    令和3年度樹木医実践技術講座  2021.10

  2. ⾥⼭林伐採後の防災機能の低下を定量化 〜コナラ根系の⼟壌斜⾯を⽀える⼒は伐採で弱まる〜

    Role(s):Informant

    日本の研究.com  プレスリリース  2021.3

  3. ⾥⼭林伐採後の防災機能の低下を定量化 〜コナラ根系の⼟壌斜⾯を⽀える⼒は伐採で弱まる〜

    Role(s):Media coverage, Informant

    名古屋大学  プレスリリース  2021.3

  4. ⾥⼭林伐採後の防災機能の低下を定量化 〜コナラ根系の⼟壌斜⾯を⽀える⼒は伐採で弱まる〜

    Role(s):Informant

    日本の研究.com  プレスリリース  2021.3

  5. 三重県環境影響評価委員

    Role(s):Advisor

    三重県地球温暖化対策課  2020.4

  6. 三重県環境影響評価委員

    Role(s):Commentator

    三重県地球温暖化対策課  2020.4

  7. 科研費公開講演会「樹木の根を掘らずに視る‐地中レーダ探査の減災への応用」

    Role(s):Lecturer

    神戸芸術センター  2016.12

  8. スギ林、ヒノキ林の土壌は20年でどう変わる?

    Role(s):Lecturer

    森林総合研究所関西支所  平成28年度関西支所公開講演会  2016.10

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    Audience: College students, Graduate students, Teachers, Researchesrs, General, Scientific, Civic organization, Governmental agency, Media

  9. 葉っぱはどのようにして出来ているの?実際にガイコツにして調べてみよう!

    Role(s):Advisor

    森林総合研究所関西支所  親子森林教室  2012.8

  10. 木は種類によって重さがちがう

    Role(s):Advisor

    森林総合研究所関西支所  親子森林教室  2011.3

  11. 森林の炭素量推定~樹木地上部から根の量を推定する~

    Role(s):Advisor

    森林総合研究所  サイエンスキャンプ  2009.8

  12. 土の中を動くモノ、留まるモノ

    Role(s):Lecturer

    森林総合研究所関西支所  平成20年度公開講演会  2008.10

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    Audience: College students, Graduate students, Teachers, Researchesrs, General, Scientific, Civic organization, Governmental agency

  13. 大地の呼吸を測る

    Role(s):Advisor

    森林総合研究所  サイエンスキャンプ  2002.8

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Media Coverage 22

  1. 倒れた岐阜の大杉を3次元データ化 保存、原因究明へ名古屋大など Internet

    朝日新聞デジタル  2021.10

  2. 豪雨で倒れた「ご神木」、樹齢1300年ではなく670年だった…根の中心部は腐朽進む Newspaper, magazine

    読売新聞  2021.10

  3. 大杉倒木「根の発達遅れ」 昨年7月豪雨 瑞浪 Internet

    読売新聞  2021.10

  4. 【瑞浪】大湫大杉倒木原因 オンライン記者発表(大湫町/神明神社) TV or radio program

    おりべネットワーク  ケーブルテレビ  2021.9

  5. 豪雨で倒れた瑞浪市の大杉 調査で「根元部分が小さい」

    メーテレ  メーテレニュース  2021.9

  6. 豪雨で倒れた岐阜のご神木、倒壊の原因解明 名古屋大のグループ

    毎日新聞  2021.9

  7. 神木倒れた原因は小さい根 雨の重み支えきれず Newspaper, magazine

    産経新聞  2021.9

  8. 瑞浪市の神社で倒れたご神木の調査結果まとまる TV or radio program

    NHK岐阜  NewsWeb岐阜  2021.9

  9. 瑞浪の大杉が倒れた原因はバランス 名大など発表 Newspaper, magazine

    中日新聞  2021.9

  10. 瑞浪「大杉」倒木小さな根が原因 Newspaper, magazine

    岐阜新聞  2021.9

  11. 大湫神明神社の大杉の倒木原因は【減災には根系の評価も】 Internet

    東濃ニュース  2021.9

  12. 倒れた大杉 根が小さかった 3次元デジタル化でくっきり 岐阜・瑞浪の神社 名大などスキャナー計測 Newspaper, magazine

    朝日新聞  2021.9

  13. ⼤杉倒⽊の原因、レーザー解析 Internet

    中⽇新聞web  2020.9

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    Author:Other 

  14. 瑞浪大湫の大杉 倒れた原因などを探る Newspaper, magazine

    東濃新聞  2020.9

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    Author:Other 

  15. ⼤杉の倒⽊原因レーザー解析 Newspaper, magazine

    中日新聞  2020.9

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    Author:Other 

  16. 3Dで倒れた大杉の復元を【大湫町で研究チームが計測】 Internet

    東濃ニュース 土岐市・瑞浪市版  2020.9

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    Author:Other 

  17. 樹齢1300年、倒れた大杉に研究者が熱視線 Internet

    朝日新聞デジタル  2020.9

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    Author:Other 

  18. ⼤杉倒⽊の原因、レーザー解析 Internet

    中⽇新聞web  2020.9

  19. 3Dで倒れた大杉の復元を【大湫町で研究チームが計測】 Internet

    東濃ニュース  東濃ニュース 土岐市・瑞浪市版  2020.9

  20. 樹齢1300年、倒れた大杉に研究者が熱視線 Newspaper, magazine

    朝日新聞デジタル  朝日新聞  2020.9

  21. 大杉倒木の原因、レーザー解析 名大准教授ら、瑞浪・大湫神明神社で調査 Newspaper, magazine

    中日新聞  2020.9

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    Author:Other 

  22. 倒れた原因など探る 瑞浪大湫の大杉 レーザー機器で調査 Newspaper, magazine

    東農新聞  2020.9

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Academic Activities 2

  1. 客員研究員

    Role(s):Planning/Implementing academic research

    森林総合研究所  2019.7 - 2021.3

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    Type:Academic research 

  2. 中部森林学会主事

    Role(s):Planning, management, etc.

    中部森林学会  2019