We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Net photosynthesis and its affecting factors in a tropical seasonal rainforest ecosystem in Southwest China.
- Authors
Song Qing-hai; Zhang Yi-ping; Tan Zheng-hong; Zhang Lei-ming; Yang Zhen; Zhao Shuang-ju; Sun Xiao-min
- Abstract
By using eddy covariance technique, this paper quantitatively analyzed the photosynthetic characteristics of tropical seasonal rainforest ecosystem and related environmental controlling factors in Xishuangbanna in 2003-2006. In the study period, less interannual difference was observed in the net photosynthesis of the ecosystem, with the maximum photosynthesis rate (Peco,opt), respiration at daytime (Reco,d), and apparent quantum yield (α) averaged by 0.813 mg·m-2 ·s-1, 0.238 mg·m-2·s-1, and 0.0023 mg·μmol-1, respectively. As affected by the interaction of air temperature (Ta) and vapor pressure deficit (VPD), the photosynthetic characteristics had some seasonal differences. In rainy season, the ecosystem had the strongest photosynthetic capacity because of the higher precipitation and warmer air temperature; in foggy and cool season, fog drip played an important role in the water relations of plants, and thereby, the ecosystem photosynthetic capacity was still higher; in dry and hot season, due to the limited precipitation and high temperature, the Ta and VPD increased, inducing a decrease of ecosystem α and Peco,opt. The net CO2 exchange of the ecosystem strongly depended on the Ta above 20 °C and the VPD above 1 kPa.
- Subjects
XISHUANGBANNA Daizu Zizhizhou (China); SOUTHWEST China; PHOTOSYNTHESIS -- Environmental aspects; RAIN forest ecology; VAPOR pressure; UPPER air temperature; PRECIPITATION variability; ANALYSIS of covariance
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2010, Vol 21, Issue 12, p3007
- ISSN
1001-9332
- Publication type
Article