Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 1 2010 10.5194/bg-7-357-2010 http://www.biogeosciences.net/7/357/2010/ http://www.biogeosciences.net/7/357/2010/bg-7-357-2010.html http://www.biogeosciences.net/7/357/2010/bg-7-357-2010.pdf 357 369 2010-01-28 Ecosystem carbon exchanges of a subtropical evergreen coniferous plantation subjected to seasonal drought, 2003–2007 X.-F. Wen H.-M. Wang J.-L. Wang G.-R. Yu X.-M. Sun sunxm@igsnrr.ac.cn Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Qingdao Agricultural University, Qingdao 266109, China The behavior of whole ecosystems in humid climate zone in response to drought is less well documented. Continuous measurements of carbon dioxide and water vapor exchange using the eddy covariance technique during 2003–2007 were made above a subtropical evergreen coniferous plantation in Southeast China. Seasonal distribution of precipitation and temperature was inconsistent during the summer, which resulted in droughts frequently. Gross ecosystem photosynthesis (GEP), ecosystem respiration (RE) and net ecosystem production (NEP) showed clear seasonality, with low rates during droughts and in winter. With statistical significance, the monthly GEP and RE increased exponentially with air temperature, but the monthly NEP was less sensitive and only increased linearly with air temperature. However, the function response of monthly NEP and its components (GEP and RE) disappeared under high temperature and low soil moisture. Monthly and yearly RE showed a statistically linear and positive dependence on the corresponding GEP. Annual NEP varied among years from 306 to 430 g C m^−2 (mean 395, SD 50). 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