Comparative study of the net exchange of CO2 in 3 types of vegetation ecosystems on the Qinghai-Tibetan Plateau

Abstract： Using the eddy covariance method,from 1 July 2003 to 30 June 2004, we conducted the observation and analysis of ecosystem CO2 flux in 3 types of alpine meadow vegetation (Kobresia humilis, Potentilla fruticosa shrub and Kobresia tibetica swamp meadows) on the Qinghai-Tibetan Plateau. The results show that the Kobresia humilis meadow, the shrub meadow and the swamp meadow's highest CO2 uptake rates are 16.78, 10.42 and 16.57 μmol·m-2·s-1 respectively, while their highest CO2 release rates are 8.22, 7.73 and 18.67 μmol·m-2·s-1 respectively. The Kobresia humilis meadow and shrub meadow's annual atmospheric uptakes are 282 g CO2/m2 and 53 g CO2/m2, respectively, while swamp meadow's annual atmospheric release is 478 g CO2/m2. This proves that the Kobresia humilis meadow and the shrub meadow on the Qinghai-Tibetan Plateau have relatively low potential for CO2 uptake and release compared to C4 grasslands, a number of lowland grasslands, and forests. Moreover, swamp meadow has relatively high release potential. This, in turn, reveals clear differences in carbon source/sink between different types of vegetation in the Qinghai-Tibetan Plateau alpine meadow ecosystem. These differences are mainly brought by differences in the vegetations' photosynthetic capacity and soil respiration. 作 者： ZHAO Liang    LI Yingnian    ZHAO Xinquan    XU Shixiao    TANG Yanhong    YU Guirui    GU Song    DU Mingyuan    WANG Qinxue   作者單位： ZHAO Liang,LI Yingnian,ZHAO Xinquan,XU Shixiao,GU Song(Northwest Plateau Institute of Biology, the Chinese Academy of Sciences, Xining 810001, China)

TANG Yanhong(National Institute for Environmental Studies, Tsukuba, Ibaraki 3050053, Japan)

YU Guirui,WANG Qinxue(Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China)

DU Mingyuan(National Institute for Agro-Environmental Science, Tsukuba, Ibaraki 3058604, Japan) 

期 刊： 科學通報（英文版）  SCI   Journal： CHINESE SCIENCE BULLETIN  年，卷(期)： 2005, 50(16)  分類號： X1  Keywords： Qinghai-Tibetan Plateau    net ecosystem CO2 exchange    eddy covariance method   

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