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《Journal of Plant Ecology》 2008-03
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CO_2 FLUXES OF ARTIFICIAL GRASSLAND IN THE SOURCE REGION OF THE THREE RIVERS ON THE QINGHAI-TIBETAN PLATEAU,CHINA

ZHAO Liang, GU Song, ZHOU Hua-Kun, XU Shi-Xiao, ZHAO Xin-Quan, and LI Ying-Nian1Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810001, China  
Aims It is important to the study of the carbon cycle and ecological issues to understand seasonal variation in CO2 flux and the influence of environmental factors on the artificial grassland in the source region of the three rivers on the Qinghai-Tibetan Plateau. Methods We utilized the eddy covariance method to observe net ecosystem CO2 exchange (NEE) and biological and environmental factors and their variation at the Elymus nutans artificial grassland from September 1, 2005 to August 31, 2006.Important findings The daily maximum uptake of CO2 was 2.38 g C·m-2·d-1 on July 30. The ratio of daily uptake and emission in August were observed, -6.82 and 2.95 μmol CO2·m-2·s-1, respectively. In the growing seasons, daily NEE was dominated by the variation of photosynthetically active radiation (PAR). At the same time, daily NEE combined with leaf area and community diversity to control photosynthetic rate and photosynthetic efficiency. Maximum photosynthetic rate was 2.46-10.39 μmol CO2·m-2·s-1, and the apparent quantum yield (denoting the maximum efficiency of light utilization in photosynthesis) was 0.013-0.070 μmol CO2·μmol-1 PAR. The influence of temperature, Q10 (1.8) in the growing season was less than in the non-growing season. The respiration of the ecosystem was mainly dominated by temperature and leaf area. Carbon absorption was not dominated by the larger temperature difference of the day and night in the growing season. Our study proved that the artificial grassland ecosystem was a carbon sink with a carbon absorption of -49.35 g C·m-2·a-1. Our study also proved that the source and sink function of carbon was influenced by the amount, intensity and seasonal allocation of annual precipitation, as well as by plant community diversity.
【Fund】: 国家自然科学基金(30770419);; 中国科学院“百人计划”项目(0429091211);; 国家重点基础研究发展计划项目(2005CB422005-01);; 国家科技支撑计划项目(2006BAC01A02)
【CateGory Index】: Q948
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