Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 2 2010 10.5194/bg-7-711-2010 http://www.biogeosciences.net/7/711/2010/ http://www.biogeosciences.net/7/711/2010/bg-7-711-2010.html http://www.biogeosciences.net/7/711/2010/bg-7-711-2010.pdf 711 722 2010-02-23 Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China M. Zhang G.-R. Yu yugr@igsnrr.ac.cn L.-M. Zhang X.-M. Sun X.-F. Wen S.-J. Han J.-H. Yan Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China Graduate University of the Chinese Academy of Sciences, Beijing, 100039, China Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China Clouds can significantly affect carbon exchange process between forest ecosystems and the atmosphere by influencing the quantity and quality of solar radiation received by ecosystem's surface and other environmental factors. In this study, we analyzed the effects of cloudiness on net ecosystem exchange of carbon dioxide (NEE) in a temperate broad-leaved Korean pine mixed forest at Changbaishan (CBS) and a subtropical evergreen broad-leaved forest at Dinghushan (DHS), based on the flux data obtained during June–August from 2003 to 2006. The results showed that the response of NEE of forest ecosystems to photosynthetically active radiation (PAR) differed under clear skies and cloudy skies. Compared with clear skies, the light-saturated maximum photosynthetic rate (Pec,max) at CBS under cloudy skies during mid-growing season (from June to August) increased by 34%, 25%, 4% and 11% in 2003, 2004, 2005 and 2006, respectively. In contrast, Pec,max of the forest ecosystem at DHS was higher under clear skies than under cloudy skies from 2004 to 2006. When the clearness index (kt) ranged between 0.4 and 0.6, the NEE reached its maximum at both CBS and DHS. However, the NEE decreased more dramatically at CBS than at DHS when kt exceeded 0.6. The results indicate that cloudy sky conditions are beneficial to net carbon uptake in the temperate forest ecosystem and the subtropical forest ecosystem. Under clear skies, vapor pressure deficit (VPD) and air temperature increased due to strong light. 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