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https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00021941
2023-01-16T03:54:56Z
643:666:667
Temporal variations in the linkage between the net ecosystem exchange of water vapour and CO2 over boreal forests in eastern Siberia
Kotani, Ayumi
Kononov, Alexander V.
Ohta, Takeshi
Maximov, Trofim C.
open access
This is the peer reviewed version of the following article: [Kotani, A., Kononov, A. V., Ohta, T. and Maximov, T. C. (2014), Temporal variations in the linkage between the net ecosystem exchange of water vapour and CO2 over boreal forests in eastern Siberia. Ecohydrol., 7: 209–225. doi:10.1002/eco.1449], which has been published in final form at [http://doi.org/10.1002/eco.1449]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
boreal forest
Siberia
evapotranspiration
CO2 exchange
water use efficiency
This study investigated evapotranspiration and CO2 exchange, observed by the eddy covariance method, over two larch-dominated forests, in the middle part of the Lena basin, eastern Siberia. Compared with the Spasskaya Pad (SP) forest, the Elgeeii (EG) forest had more plant biomass and a soil texture that allowed for larger water retention. Observations in three growing seasons revealed that the two sites had similar seasonal patterns of meteorological conditions and almost the same total evapotranspiration; however, the net and gross uptakes of CO2 at the EG forest were 1·61 and 1·31 times those at the SP forest, respectively. The difference in aboveground biomass was probably responsible for the higher productivity at EG. Less aboveground biomass would result in less transpiration by trees at SP, which would be compensated for in total evapotranspiration by soil evaporation and transpiration by the forest floor vegetation. It is likely that forest transpiration is commonly optimized to the same level of evapotranspiration under similar meteorological conditions through differences in the contributions of evapotranspiration from the forest floor vegetation and the soil water availability. Water use efficiency (WUE) displayed different patterns, reflecting the seasonal variations in each flux. Seasonal sequences in the WUE at EG indicated a midsummer depletion, which is commonly observed in forest ecosystems under a broad climate. Daily variation corresponding to the vapour pressure deficit and the cloud cover conditions (reduced solar radiation) was also observed. In contrast, WUE was relatively invariable at the seasonal and daily scales at SP. Copyright © 2013 John Wiley & Sons, Ltd.
Wiley
2014-04
eng
journal article
AM
http://hdl.handle.net/2237/24075
https://nagoya.repo.nii.ac.jp/records/21941
https://doi.org/10.1002/eco.1449
1936-0592
Ecohydrology
7
2
209
225
https://nagoya.repo.nii.ac.jp/record/21941/files/10_1002eco_1449.pdf
application/pdf
1.4 MB
2018-02-21