Faculty Profiles - KOTANI, Ayumi

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Response of larch forest CO2 exchange on wetness variability of permafrost active layer in eastern Siberia International conference

Kotani, A., Ohta, T., Maximov, T.C.

The 2nd Asian Conference on Permafrost

Variation of larch tree transpiration and forest evapotranspiration at eastern Siberia - effect of hydro-thermal condition in active layer of permafrost

Effect of variation of environmental factors on forest evapotranspiration : Comparison in eastern Siberian larch forests

The Japanese Forest Society Congress

Turbulence in and above larch forest canopies in eastern Siberia

kamikura yoshito, Kotani Ayumi, Ohta Takeshi

The Japanese Forest Society Congress

Effects of vegetational change on root water uptake of larch forests in Eastern Siberia

Yamada Takuya, Ohta Takeshi, Kotani Ayumi

The Japanese Forest Society Congress

Interannual variability of surface heat balance and atmospheric boundary layer in Siberian and Mongolian boreal forest

Galtbayar Saruul, Kotani Ayumi, Ohta Takeshi

The Japanese Forest Society Congress

Evapotranspiration and carbon dioxide fluxes over larch forests with different soil water condition at eastern Siberia International conference

4th International Symposium on Arctic Research (ISAR-4)

常緑落葉混交林におけるCO2吸収期間の年変動

小谷亜由美

日本農業気象学会研究発表会

Evapotranspiration at Larch forest in Eastern Asia : a wavelet analysis across multiple time scales

nakatsubo Minoru, Kotani Ayumi, Ohta Takeshi

Proceeding of Annual Conference

Event date： 2015

Language：Japanese Presentation type：Oral presentation (general)

We analyzed the relationships between evapotranspiration and environmental factors using dataset of east Eurasian larch forest of eastern Siberia, northern Mongolia and Japan for the purpose of understanding the relationships between the forests and environmental changes.  We used the wavelet analysis across multiple timescales. We selected environmental factors, including soil water content, short-wave radiation, air temperature and water vapor deficit to analyze co-variability with the evapotranspiration. There was difference in the timescale in which co-variability is stronger than the other site. Siberian and Mongolian forest have stronger co-variability in the seasonal variation, while Japanese forest has stronger one in relatively short timescale. And the factors that have a great site-to-site difference in co-variability were soil water content and water vapor deficit. Both of them express the water condition at the forest. Therefore, the main reason of difference in site-to-site is water condition in the forest both of above and belowground.

DOI： 10.11520/jshwr.28.0_100075

Effects of interception loss on changing PAI and rainfall intensity by using artificial rainfall system

Yamada Atsushi, Ohta Takeshi, Kotani Ayumi

The Japanese Forest Society Congress

Evapotranspiration at Larch forests in Eastern Asia: a wavelet analysis across multiple time scales

Nakatsubo Minoru, Ohta Takeshi, Kotani Ayumi

The Japanese Forest Society Congress

Role of soil texture and canopy composition on evapotranspiration and CO2 exchange over larch forest International conference

小谷亜由美・太田岳史・AV Kononov・TC Maximov

8th annual international symposium on "C/H2O/energy balance and climate over boreal and arctic regions with special emphasis on eastern Siberia"

常緑落葉混交林における二酸化炭素交換量と吸収期間の年変動

小谷亜由美・太田岳史

日本気象学会秋季大会

東シベリアのカラマツ林でみられる凍土・森林・大気のかかわり

小谷亜由美

日本雪氷学会雪氷研究大会/気象水文・凍土合同分科会

D351 常緑落葉混交林における二酸化炭素交換量と吸収期間の年変動(大気-陸面間の水・エネルギー・炭素フラックスに関する最新研究2014,スペシャル・セッション)

小谷亜由美, 太田岳史

大会講演予講集

Primary factors in interannual variation of latent heat fluxes from overstory and understory in Siberian larch forest

Saito Atsushi, Kotani Ayumi, Ohta Takeshi, Iijima Yoshihiro

The Japanese Forest Society Congress

Characteristics of long term evapotransration and responses in a evergreenand deciduous forest

innnami kento, Ohta Takeshi, Kotani Ayumi, Nakai Taro

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, Hiyama Tetsuya, Jack Kambatuku, Iijima Morio

Proceeding of Annual Conference

Event date： 2014

Language：Japanese Presentation type：Oral presentation (general)

In order to introduce mixed cropping of rice and pearl millet, the effect of mixed cropping on evapotranspiration in a small seasonal wetland (<i>ondombe</i>) of northern Namibia was investigated. An experimental sloped-field was established to irrigate spatially different in water levels. Meteorological observation including Bowen-ratio technique was conducted at two sites of different surface conditions in the field. Net radiation and latent heat flux at the lower site was larger than the upper site without water surface, while sensible heat flux is smaller at the lower site than at the upper site. The responses of the surface conductance to the environmental variables were investigated by means of Jarvis-type conductance model. It has been shown that soil water content was an important factor for evapotranspiration at both of sites. Continuous observation is required to clarify the effect of mixed cropping system on evapotranspiration characteristics in this region.

DOI： 10.11520/jshwr.27.0_100105

Flux-based water use efficiency over two larch forests with different soil and canopy structure at eastern Siberia International conference

Kotani A, Ohta T, Maximov T

American Geophysical Union fall meeting

Net ecosystem water use efficiency over two larch forests at eastern Siberia International conference

Kotani A, Ohta T, Kononov A, Maximov T

2nd International Conference on "Global Warming and the Human-Nature Dimension in Siberia

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