Faculty Profiles - KOTANI, Ayumi

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東シベリア森林地帯における大気陸面研究－タワーフラックス観測を中心に International conference

小谷亜由美・太田岳史

日本気象学会秋季大会

Hydrological studies of a larch forest at northeastern Siberia International conference

Kotani, A.

Russian-Japanese Symposium on Global Climate Change

Forest Evapotranspiration and CO2 Flux over Larch Forests with Different Canopy Structure at Eastern International conference

Kotani, A., Hayashi, M., Ohta, T.,Maximov, T.

11th Asiaflux international workshop

Palmer Drought Severity Indexを指標とした日本における乾燥/湿潤期間の時空間変動

高橋瑠想・小谷亜由美

地球惑星連合大会

東シベリアカラマツ林における二酸化炭素吸収特性

林美晴・小谷亜由美

地球惑星連合大会

Effects of waterlogging stress on photosynthetic rate and leaf element content in Quercus serrata

Ito Tsubasa, Ohta Takeshi, Kotani Ayumi, Tomioka Rie

The Japanese Forest Society Congress

The interannual variation of evapotranspiration and photosynthesis of the larch forest in Spasskaya Pad, Russia

Ohta Takeshi, Kotani Ayumi, Ito Syougo, Hanamura Miho, Iijima Yoshihiro, Maximov Trofim, Kononov Alexander

The Japanese Forest Society Congress

Analysis of characteristics of evapotranspiration in northern Namibia for introducing the mixed cropping of rice and pearl millet

Hanamura Miho, Ohta Takeshi, Kotani Ayumi, Suzuki Tetsuji, Hiyama Tetsuya, Jack Kambatuku, Iijima Morio

Proceeding of Annual Conference

Event date： 2013

Language：Japanese Presentation type：Oral presentation (general)

The northern Namibia is known as a semi-arid region, which involves both the risks of drought and flood. Under such an environment, there is the attempt to introduce the mixed cropping of rice and pearl millet in the seasonal wetland for stable food supply. We installed the Bowen ratio measurement systems in the two model fields on the gentle slope: the upper site (pearl millet, unirrigated) and lower site (rice, deep-water irrigated). Measurements of the environmental variables and ET started since Sep. 2012. In this study, we analyze the evapotranspiration characteristics in the model field comparing ET difference between irrigated lower site and unirrigated upper site before planting the crops, including dry and rainfall periods.

DOI： 10.11520/jshwr.26.0.270.0

Vegetation change of whole ecosystem and understory vegetation in eastern Siberian boreal forest

Saito Atsushi, Kotani Ayumi, Ohta Takeshi, Iijima Yoshihiro, Maximov Trofim, Kononov Alexander

The Japanese Forest Society Congress

Effects of Forest structure on the Evapotranspiration

Miyagi Yu, Matsumoto Kazuho, Ohta Takeshi, Nakai Taro, Daikoku Ken'ichi, Sumida Akihiro, Iida Shin'ichi, Kotani Ayumi, Takashima Atsushi, Trofim C. Maximov, Hara Toshihiko, Taniguchi Shingo

The Japanese Forest Society Congress

Net ecosystem exchange of CO2 and Evapotransipration over Siberian boreal forests

Kotani Ayumi, Hayashi Miharu, Ohta Takeshi, Maximov Trofim

The Japanese Forest Society Congress

東シベリア森林における陸面乾湿変動と大気境界層の応答

小谷亜由美

水文・水資源学会研究発表会 2021.9

東シベリア南部のカラマツ林における群落蒸発散 International conference

小谷亜由美，太田岳史，Ｔマキシモフ

第123回日本森林学会

P1a6 陸域生物圏モデルBEAMSを用いたシベリア地域の水、エネルギー、炭素収支解析(ポスター・セッション)

相庭一輝, 佐々井崇博, 小谷亜由美, 太田岳史

大会講演予講集

Ecohydrological changes in relation to moistened active layer in eastern Siberia

Iijima Yoshihiro, Kotani Ayumi, Ohta Takeshi, Maximov Trofim

Proceedings of the General Meeting of the Association of Japanese Geographers

Event date： 2012

Language：Japanese Presentation type：Oral presentation (general)

Deepening of the active layer due to moisture saturation within the soil has negatively impacted the growth of larch forests near Yakutsk, eastern Siberia. According to sap flow measurements, transpiration from larch trees was reduced at the concave micro-topography with the deepening and moistening of the active layer. Perennial waterlogged conditions led to mortality of mature trees. Several trees with reduced amounts of foliage showed a remarkable reduction in stomatal conductance during the 2009 growing season. These findings indicate that wetting trends in a permafrost region may lead to unexpected ecohydrological responses with respect to permafrost degradation in eastern Siberia.

DOI： 10.14866/ajg.2012s.0_100034

Seasonal variability of scalar turbulent transport above forest canopy

Kotani Ayumi, Hamazaki Shunki, Ohta Takeshi

Proceeding of Annual Conference

Event date： 2012

Language：Japanese Presentation type：Oral presentation (general)

This study investigates seasonal variation in applicability of the turbulent similarity theory, and similarity or dissimilarity in the scalar transfer characteristics observed over forest canopy in the tropical monsoon, temperate, and boreal region. Deviation from the similarity theory and the small transfer efficiency was observed for CO2 variation at the boreal and temperature variation at the cool-temperate forest. Forests including deciduous trees showed clear seasonal variation in not only scalar flux itself but also its transfer characteristics especially in the case of CO2 variation, while the evergreen forest did not present such seasonal variation.

DOI： 10.11520/jshwr.25.0.276.0

Interannual and seasonal change of surface energy balance in temperate mixed forest.:Relationship between energy balance closure and energy fluxes.

Tanaka Takayuki, Kotani Ayumi, Ohta Takeshi

The Japanese Forest Society Congress

Variability of evapotranspiration in an eastern Siberian larch forest over a 12 year period from 1998 to 2011:Effects of high soil water conditions on evapotranspiration

HANAMURA Miho, OHTA Takeshi, KOTANI Ayumi, ITO Shogo, MAXIMOV Trofim C., KONONOV Alexander V., MAXIMOV Ayal P.

The Japanese Forest Society Congress

The variable factor of carbon dioxide flux in an eastern Siberian larch forest.

Ito Shogo, Ohta Takeshi, Kotani Ayumi, Maximov Trofirm, Kononov Alexander

The Japanese Forest Society Congress

Response of surface conductance, aerodynamic conductance and evapotranspiration to ambient conditions in boreal to tropical forests in eastern Asia:Sensitivity analysis of evapotranspiration through surface conductance and aerodynamic conductance

Khatun Rehana, Ohta Takeshi, Kotani Ayumi

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