Predominance of Precipitation and Temperature Controls on Ecosystem CO2 Exchange in Zoige Alpine Wetlands of Southwest China

文献类型： 外文期刊

第一作者： Hao, Yan Bin

作者： Hao, Yan Bin;Cui, Xiao Yong;Wang, Yan Fen;Kang, Xiao Ming;Mei, Xu Rong;Wu, Ning;Luo, Peng;Zhu, Dan

作者机构：

关键词： Eddy covariance;Gross ecosystem photosynthesis;Net ecosystem exchange;Phenological stage

期刊名称：WETLANDS （ 影响因子：2.204； 五年影响因子：2.653 ）

ISSN： 0277-5212

年卷期： 2011 年 31 卷 2 期

页码：

收录情况： SCI

摘要： Net ecosystem exchange (NEE) of carbon dioxide (CO2) was measured at Zoige wetland using the eddy covariance technique. Analysis of CO2 fluxes in two years showed Zoige wetland was a net CO2 sink of -47.1 and -79.7 g C m(-2) a(-1) in 2008 and 2009, respectively. The peak NEE value was -0.54 mg CO2 m(-2) s(-1) (the negative value signifies net ecosystem carbon gain from air). The maximal daily integrated NEE was -4.1 g C m(-2) d(-1) during the peak growth season (from July to August). Gross ecosystem photosynthesis was likely more variable than ecosystem respiration at both seasonal and interannual timescales in this wetland. Our data strongly suggested that the combination of precipitation and temperature, as well as phenological stage of vegetation, controlled the dynamics of ecosystem carbon gain, even in drought years. Therefore, an accurate representation of these parameters in climate models is critical to the success of forecasting carbon budgets of alpine wetlands.

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