研究者詳細 - 谷川　東子

論文 - 谷川　東子

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Contrasting patterns of nitrogen release from fine roots and leaves driven by microbial communities during decomposition. 査読有り国際共著国際誌

Tanikawa T, Maie N, Fujii S, Sun L, Hirano Y, Mizoguchi T, Matsuda Y

The Science of the total environment 頁： 158809 2022年9月

Leachate from fine root litter is more acidic than leaf litter leachate: A 2.5-year laboratory incubation. 査読有り

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

Science of the Total Environment 645 巻頁： 179 - 191 2018年

Acidification processes in soils with different acid buffering capacity in Cryptomeria japonica and Chamaecyparis obtusa forests over two decades. 査読有り

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

Forest Ecology and Management 334 巻頁： 284 - 292 2014年12月

Intraspecific variation in root system structure in a Pinus thunbergii stand grown in a gravelly spit coast. 査読有り

Hirano, Y., Todo, C., Tanikawa, T., Yamase, K., Ohashi, M., Dannoura M., Okamoto, Y., Doi, R., Yoshida, G., Ikeno, H.

Journal of Forest Research 2024年11月

Effects of fungicide treatments on mycorrhizal communities and carbon acquisition in the mixotrophic <i>Pyrola japonica</i> (Ericaceae) 査読有り国際共著国際誌

Sakae, K; Kawai, S; Kitagami, Y; Matsuo, N; Selosse, MA; Tanikawa, T; Matsuda, Y

MYCORRHIZA 2024年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Mycorrhiza

Pyrola japonica, a member of the family Ericaceae, is a mixotroph that grows on forest floors and obtains carbon (C) from both its photosynthesis and its mycorrhizal fungi. Its mycorrhizal community is dominated by Russulaceae. However, the mechanism of its C acquisition and its flexibility are not well understood. Our aim was to assess the impact of disturbance of the mycorrhizal fungal communities on C acquisition by P. japonica. We repeatedly applied a fungicide (Benomyl) to soils around P. japonica plants in a broad-leaved forest of central Japan, in order to disturb fungal associates near roots. After fungicide treatment, P. japonica roots were collected and subjected to barcoding by next-generation sequencing, focusing on the ITS2 region. The rate of mycorrhizal formation and α-diversity did not significantly change upon fungicide treatments. Irrespective of the treatments, Russulaceae represented more than 80% of the taxa. Leaves and seeds of the plants were analysed for 13C stable isotope ratios that reflect fungal C gain. Leaf and seed δ13C values with the fungicide treatment were significantly lower than those with the other treatments. Thus the fungicide did not affect mycorrhizal communities in the roots, but disturbed mycorrhizal fungal pathways via extraradical hyphae, and resulted in a more photosynthetic behaviour of P. japonica for leaves and seeds.

DOI： 10.1007/s00572-024-01157-5

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PubMed

Volcanic ash in soil is a source of strontium in stream water in chert-bedrock forests in Mount Amamaki, Japan. 査読有り

Koshikawa, M.K., Watanabe, M., Sase, H., Morohashi, M., Takahashi, M., Tanikawa, T., Takahashi, M., Takahashi, A., Murata, T., Takamatsu, T., Miura, S., Shin, KC, Nakano, T.

Ecological Research 2024年5月

Effect of sprouting and corresponding root distribution of the shrub species Eurya japonica on slope stability 査読有り国際誌

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

CATENA 238 巻 2024年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Catena

After disturbance sprouts emerge from the ground, generating multi-stemmed plants as they grow, which represents a means of rapidly recovering above ground biomass. We hypothesised that the above- and below ground characteristics would differ depending on the number of stems in individual shrubs, which is likely to compensate for the slope stability of soil reinforcement by plant roots in forests. We focused on the dominant shrub species of abandoned secondary forests, Eurya japonica, and conducted an excavation of the entire root system. The aims of this study were to (i) determine the root system architecture of single- and multi-stemmed E. japonica, (ii) determine whether there were differences in the slope stability by soil reinforcement of roots between the single- and the multi-stemmed plants, and (iii) provide recommendations based on the study finding on how single- and multi-stemmed plants generated during the disturbance should be managed to improve the slope stability. Our results showed that an increase in the total basal stem area at 0.1 m above ground level (BA0.1) increased the above- (MA) and the below ground biomass (MB) with high fitting linear regression, regardless of whether the plants were single- or multi-stemmed. In contrast, the spread of roots, as indicated by the maximum lateral root spread (Rdis) and maximum rooting depth (Rdep), was related to the maximum stem diameter at 0.1 m above ground level (D0.1) with high fitting linear regression among the shoots in the plant. If the above ground shoots and below ground roots are considered as a continuous pipe and the multi-stemmed plants as an assemblage of single-stemmed plants, we can effectively explain the relationship between the total basal stem area or maximum diameter of each stem, and the below ground biomass, or the spread of the roots. There is less space available below ground than above ground for multi-stemmed trees. This is especially the case around the root stump, where the roots of each stem compete and inhibit growth. This can result in significant lower root–shoot ratios of 0.23 ± 0.04 for multi-stemmed plants compared to 0.33 ± 0.01 for single-stemmed plants. This imbalance suggests that multi-stemmed plants growing on forest slopes are more unstable and are more likely to fall. Soil reinforcement by roots did not significantly differ between single- and multi-stemmed plants. However, the displacement at the maximum soil reinforcement by roots was significantly greater in 83.3 ± 21.7 cm for the multi-stemmed plants than in 40.0 ± 18.2 cm for single-stemmed plants because multi-stemmed plants with competing roots resulted in fewer roots of less than 15 mm in diameter. This allowed the formation of a slip surface on the forest slopes because of the substantial displacement (bundle elongation) of roots during the pullout. Therefore, the resistance of multi-stemmed plants to shallow landslides on forest slopes was lower than that of single-stemmed plants. Traditional forest management, that is, reducing the number of stems of multi-stemmed plants, is effective in increasing sprouting growth and biomass production. It may also be effective in increasing forest slope stability at landscape levels over longer timescales.

DOI： 10.1016/j.catena.2024.107869

Scopus

Fungi and bacteria in the rhizosphere of Cryptomeria japonica exhibited different community assembly patterns at regional scales in East Asia 査読有り

Obase, K; Kitagami, Y; Tanikawa, T; Chen, CF; Matsuda, Y

RHIZOSPHERE 28 巻頁： 100807 - 100807 2023年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Rhizosphere

Rhizosphere microbes are key components of soil biodiversity involved in forest ecosystem functions. However, the patterns of community structure and community assembly for different domains of microbes (i.e., fungi and bacteria) remains poorly understood at broad spatial scales. We examined community structure of rhizosphere fungi and bacteria in eight Cryptomeria japonica plantations distributed from cool temperate to subtropical zones in Japan and Taiwan. Beta diversity of fungal and bacterial communities significantly related to environmental (soil pH, C/N ratio or electrical conductivity) and spatial factors, but the fungal and bacterial communities were assembled by different ecological processes. Null model analysis showed that drift (34.4%) and dispersal limitation (48.9%) were the dominant drivers shaping fungal communities, and homogeneous selection (72.1%) were dominant in bacterial communities, indicating that stochasticity and determinism dominate community assembly of fungi and bacteria, respectively. Co-occurrence network analyses targeting frequently detected microbial taxa indicated that significant relationships were detected mostly between bacterial taxa (381/438) followed by between fungal and bacterial taxa (55/438). Putative biological interactions (40.2% and 75.0% between bacterial taxa and between fungal and bacterial taxa, respectively) and environmental filtering (33.6%–57.6%, 16.7%–20.9%) contributed highly to the co-present relationships of taxon pairs, and environmental filtering (55.3%–86.2%, 35.5%–71.0%) contributed highly to the mutually exclusive relationships of taxon pairs, indicating that not only environmental factors but also biotic interaction are important processes in aggregation among fungal and bacterial taxa. It was suggested that fungi are more influenced by stochastic processes than biotic and abiotic environmental filtering, whereas bacteria are more influenced by biotic interactions and abiotic factors such as soil properties and climate than stochastic processes at the regional scale. The results of this study provide a comprehensive view of microbial dynamics surrounding woody fine roots that can be useful for predicting the response of forest ecosystems to local and global environmental changes in East Asian cedar plantations.

DOI： 10.1016/j.rhisph.2023.100807

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Soil acidity accelerates soil organic matter decomposition in Cryptomeria japonica stands and Chamaecyparis obtusa stands 査読有り国際誌

Hayashi, R; Maie, N; Wagai, R; Hirano, Y; Matsuda, Y; Okamoto, T; Wada, R; Tanikawa, T

PLANT AND SOIL 2023年10月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Plant and Soil

Background and aims: Research has focused on behavior of particulate organic matter (POM) and mineral-associated organic matter (MAOM) in acidic soils, but little attention has been given to the effects of tree species and vertical distribution of these components. With the ultimate aim of preserving soil organic matter, this study clarifies POM and MAOM status throughout the soil profiles of Cryptomeria japonica stands and Chamaecyparis obtusa stands. Methods: In 11 C. japonica stands and 7 C. obtusa stands with contrasting soil acidities (i.e., acid buffering capacities, ABC), we collected soil samples from three depths (0–10, 10–20, 20–40 cm) that were then density-fractionated into a light fraction (LF) mainly with POM, middle fraction (MF) mainly with MAOM, and heavy fraction with scarce MAOM. Alkali-extractable compounds within LF and MF were investigated by using fluorescence excitation emission matrices-parallel factor analysis. Results: Although POM content was similar between the ABCs for both tree species, MAOM content in the low-ABC soils was higher (C. japonica) or lower (C. obtusa) than in the high-ABC soils. Principal component analysis discriminated fluorescence components in terms of their origin, oxidative degradation, and decomposed structure. Based on these characteristics, POM in the low-ABC soils was more oxidatively degraded than that in the high-ABC soils, whereas MAOM in the low-ABC soils was more plant-derived/highly-decomposed (C. japonica) and more microbially metabolized (C. obtusa) throughout the profiles. Conclusion: Our findings revealed that POM and MAOM were more decomposed due to the soil acidity in C. japonica stands and C. obtusa stands, respectively.

DOI： 10.1007/s11104-023-06308-9

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その他リンク： https://link.springer.com/article/10.1007/s11104-023-06308-9/fulltext.html

里山林伐採後の樹木根による土壌補強強度の変化招待有り

山瀬敬太郎・藤堂千景・鳥居宣之・谷川東子・山本智究・池野英利・大橋瑞江・檀浦正子・平野恭弘

水利科学 387 巻頁： 1 - 17 2022年10月

Fine root litter traits of Chamaecyparis obtusa 査読有り国際誌

Yoshida G., Doi R., Wada R., Tanikawa T., Hirano Y.

Ecological Indicators 142 巻 2022年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Ecological Indicators

The purpose of this study was to clarify the process of Chamaecyparis obtusa (Sieb. & Zucc.) Endl. fine root shedding and the morphological traits of the resulting root litter. We developed a method for direct monthly sampling of root litter from the fine root system in the field. We proposed a field incubation method using centrifuge tubes with glass beads as the medium and throughfall as the nutrient solution, in which an undamaged sample of the fine root system still connected to the tree is inserted. Using this method, we collected root litter from C. obtusa for 12 months after the installation. The monthly amounts of the root litter of from the incubated fine root systems differed significantly among the sampling months. On the other hand, the morphological traits such as the root litter length and diameter of each branch order did not differ significantly among months. The first-order root litter was shorter than the incubated living first-order roots. The first-order roots were shed both at the branching positions and in the middle of first-order roots. We concluded that fine root litter with similar morphology is shed every month. Assessment of the fine root litter traits by using the new direct sampling method and the new soil ecological indicator “initial tissue C inputs” from fine roots into forest soil will improve our understanding of forest belowground carbon cycling and its indexation.

DOI： 10.1016/j.ecolind.2022.109276

Scopus

An increase of fine-root biomass in nutrient-poor soils increases soil organic matter but not soil cation exchange capacity 査読有り国際誌

Hayashi R., Maie N., Wagai R., Hirano Y., Matsuda Y., Makita N., Mizoguchi T., Wada R., Tanikawa T.

Plant and Soil 2022年9月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Plant and Soil

Purpose: Fine roots are an important source of soil organic matter (SOM); however, it is unclear whether the cation exchange capacity (CEC) of leaf-derived and root-derived organic matter is comparable. We previously found that in surface soils of Cryptomeria japonica stands with low acid buffering capacity (ABC), fine-root biomass and total carbon (TC) content were higher than in high-ABC soils, but the CEC of the two soil types was almost the same. This result was unexpected, because TC is generally related to CEC. This study aimed to clarify why CEC was not enhanced in the low-ABC soils. Methods: Surface soils at eleven C. japonica stands with contrasting ABCs were separated into different density fractions: light (LF, containing unstabilized SOM), middle (MF, containing stabilized SOM), and heavy (HF, mainly minerals). The C composition of LF, MF, and tree organs was investigated by solid-state 13C NMR analysis. Results: The carboxyl C content of MF, which had a significant positive correlation with CEC, did not differ significantly between the low- and high-ABC soils, even though the alkyl/O-alkyl ratio suggested more SOM decomposition in the low-ABC soils. This ratio had a significant negative correlation with soil pH (H2O) in both LF and MF and a positive correlation with fine-root biomass in MF. Furthermore, aromatic C was preferentially decomposed in the low-ABC soils. Conclusion: In the low-ABC soils, the increase of root litter input did not increase the carboxyl group content in MF, and thus did not increase its CEC, owing to increased SOM degradation.

DOI： 10.1007/s11104-022-05675-z

Scopus

Maximum Rooting Depth of Pinus thunbergii Parl. Estimated with Depth at the Center Point of Rotation in a Tree-Pulling Experiment in a Coastal Forest in Japan 査読有り

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

FORESTS 13 巻 ( 9 ) 2022年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Forests

Tree resistance to uprooting can be estimated as the critical turning moment in tree-pulling experiments. The depth at the center point of rotation (Dcp) in tree-pulling experiments is measured as an indicator of below-ground traits and is related to this critical turning moment. However, few researchers have investigated the relationship between the Dcp and maximum root depth. Our objective in this study was to clarify whether the Dcp in tree-pulling experiments can be estimated as the maximum root depth of Pinus thunbergii Parl. in sandy soils. We also estimated which position of displacement of the center of rotation (Cp) can be applied as the Dcp. We conducted tree-pulling experiments, and compared the Dcp obtained from images with the measured maximum root depth. We found significant positive correlations between the Dcp and maximum root depth. The Cp displacement concentrated immediately below the stem when the maximum critical turning moment was reached. This position should be measured as the Dcp, which is related to the maximum root depth. We found that the Dcp can serve as a parameter, preventing the need for uprooting, when tree-pulling experiments are performed to obtain an important below-ground trait for understanding the critical turning moment.

DOI： 10.3390/f13091506

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Archaeal community structures associated with fine root systems of Cryptomeria japonica (Cupressaceae) in central Japan 査読有り国際誌

Mine Taichiro, Kitagami Yudai, Tanikawa Toko, Matsuda Yosuke

JOURNAL OF FOREST RESEARCH 2022年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Forest Research

Archaea live in extreme environments and have been found in non-extreme environments in recent years. Although most studies have focused on the nitrification function of archaea in forest soils, few studies have focused on how archaea in rhizospheres are involved in nutrient absorption. To elucidate the archaeal community pattern inhabiting the fine roots of trees, we examined the taxonomic identity and community structure of archaea in Japanese cedars (Cryptomeria japonica). Root samples were collected from six C. japonica plantations in central Japan. DNA was separately extracted from the first- and third-order roots, and archaeal taxa were determined by the cloning method focusing on 16S rDNA. As a result, 90% of the sequences were classified as in the phylum Thaumarchaeota, with 1.1b and 1.1c groups in the phylum accounting for 65% and 25%, respectively. Archaeal community structures were significantly correlated with soil pH, but neither the root orders nor the plantation sites showed significant clustering. These results suggest that Thaumarchaeota is the dominant archaeal group in the fine roots of C. japonica, and community structures are affected by a proximate chemical factor of soil acidity.

DOI： 10.1080/13416979.2022.2108657

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シンポジウム「震災から10年：津波にねばり強い海岸林（もり）づくりの「これまで」と「これから」」の開催報告招待有り

小野賢二, 野口宏典, 吉田俊通, 藤田早紀, 渡辺名月, 新田響平, 大谷達也, 太田敬之, 谷川東子, 平野恭弘, 渡邉仁志, 山下尚之

森林立地 64 巻 ( 1 ) 頁： 39 - 44 2022年6月

3D reconstruction using Structure-from-Motion: a new technique for morphological measurement of tree root systems

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

PLANT AND SOIL 2022年5月

記述言語：日本語出版者・発行元：Plant and Soil

Purpose: Clarification of root architecture is important for understanding tree root functions. 3D laser scanning reconstructs the 3D structure of root system with high accuracy, but the devices are large and expensive. The Structure-from-Motion with multi-view stereo-photogrammetry (SfM-MVS) method reconstructs the 3D structure of an object from multiple images. This method is suitable for field research because it acquires the 3D data with a commercially available digital camera. Our aim in this study was to test the applicability of the SfM-MVS method for morphological measurement of tree root systems. Methods: The 3D root system model was created using a dummy and three black pine (Pinus thunbergii) root systems. Image data were collected from the root systems using a camera and reconstructed using the free software, VisualSfM and MeshLab. We evaluated the accuracy of morphological data estimated from the 3D models by comparing them with real data obtained from manual measurements of the root systems. Results: The 3D reconstructions of the dummy and black pine root systems were successful. The root mean squared error values for the morphological features in the pine root systems ranged from 4 to 24%, which was sufficiently accurate for a successful 3D model. However, the RMSE values were larger than that of dummy root, ranging from 2 to 9%. Conclusion: The SfM-MVS method is a new tool, based on non-specialised equipment and free software, to obtain the 3D structure of tree root systems. The morphological features of it can be successfully measured from the reconstructed models.

DOI： 10.1007/s11104-022-05448-8

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Sulfur accumulation in soil in a forested watershed historically exposed to air pollution in central Japan 査読有り

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

GEODERMA 407 巻頁： 115544 - 115544 2022年2月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Geoderma

Forest soils that have accumulated anthropogenic sulfur (S) as a result of historical air pollution may gradually or suddenly release inorganic sulfate either by desorption of inorganic sulfate or by mineralization of organic S, even after mitigation of previous air pollution. The release of inorganic sulfate from soil to surface water leads directly to watershed acidification. Thus, whether the organic S compounds that have accumulated in soils are resistant to microbial activity, due to formation of organo-mineral complexes, is essential information for management of forest soil ecosystem services. A nationwide air pollution monitoring survey by the Japanese Ministry of the Environment identified acidification of both surface water and soil in the Lake Ijira watershed of central Japan, presumably sourced from the Chukyo Industrial Area which lies upwind of the watershed. We compared the amount of S accumulated in the Ijira soils (Dystrudepts) with that in comparable soils in other watersheds in central Japan that were less affected by industrial air pollution. To determine how much mineral-associated organic S had accumulated in the Ijira soils, we measured pyrophosphate- extractable S. We used high-resolution x-ray fluorescence (HRXRF) spectroscopy with a double-crystal type high energy resolution spectrometer to estimate the oxidation states of both mineral-associated and free organic S. We also measured S isotope compositions to explore S dynamics in the soils. We found that more S had accumulated in the Ijira soils than in the comparable soils from other watersheds in central Japan. Concentrations of total S in the Ijira soils varied among soil horizons, reaching more than 1000 mg S kg−1 in some horizons. Mineral-associated organic S accounted for more than half of the total accumulated S. High-resolution x-ray fluorescence spectrum analyses showed that mineral-associated organic S was retained at both high and low oxidation states. The δ34S values of total S in the deeper horizons tended to be higher than those of the uppermost horizons of the Ijira soils and correlated positively with concentrations of extractable Al and Fe oxides (which characterize pedogenic minerals). Our results suggest that about half of total accumulated S in Ijira soils is stabilized in pedogenic minerals and the remainder comprises free organic S and adsorbed inorganic sulfates. There might have been repetitive mobilization and immobilization of S and the degraded organic S might have greater affinity with pedogenic minerals. Further, the ratio of total C to mineral-associated organic S correlated negatively with concentrations of extractable Al and Fe oxides, suggesting that organic S is more resistant to mineralization than organic C because S is preferentially associated with the pedogenic minerals. Monitoring of the chemical states of S compounds in soils historically exposed to air pollution is recommended to assist in prediction of the fate of the S compounds that have accumulated in them.

DOI： 10.1016/j.geoderma.2021.115544

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スギ根系が抱きかかえている土壌の量はどれくらい？－台風21号が地上に残した根鉢の解体－

谷川東子, 池野英利, 藤堂千景, 山瀬敬太郎, 大橋瑞江, 岡本透, 溝口岳男, 中尾勝洋, 金子真司, 鳥居厚志, 稲垣善之, 中西麻美, 平野恭弘

水利科学 383 巻頁： 1 - 35 2022年2月

Can ground-penetrating radar detect adjacent roots and rock fragments in forest soil? 査読有り

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

PLANT AND SOIL 468 巻 ( 1-2 ) 頁： 239 - 257 2021年11月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Plant and Soil

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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Colonization status and community structure of arbuscular mycorrhizal fungi in the coniferous tree, Cryptomeria japonica, with special reference to root orders 査読有り

Matsuda Yosuke, Kita Kohei, Kitagami Yudai, Tanikawa Toko

PLANT AND SOIL 468 巻 ( 1-2 ) 頁： 423 - 438 2021年11月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Plant and Soil

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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