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Impact of Cloud on Net Ecosystem CO2 Exchange of Alpine Meadow in Tibetan Plateau

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Meteorological elements and CO2 fluxes over alpine meadow ecosystem were observed continuously from 2004 to 2005in Damxung Alpine Meadow Flux Station,China Flux Network.Based on the eddy covariance CO2 fluxes and meteorological data obtained,the relationships among the CO2 fluxes,the cloud amount,and the meteorological factors in alpine meadow ecosystem were explored and analyzed.Some conclusions can be drawn from the discussion with previous researches as following:(1)the cloud amount can affect the net ecosystem CO2 exchange(NEE)of alpine meadow on Tibetan Plateau;(2)the soil temperature sensitive to the cloud amount,is a major environmental controlling factor for NEE,and closely relates to the maximum of NEE.In the morning period with large cloud amount,the NEE reaches its maximum when the clearness index ranges from 0.5 to 0.7; yet in the afternoon it comes to the maximum with the index from 0.2 to 0.35.The span of soil temperature covers from 12 to 15℃ as the NEE at its highest;(3)the scatterplots between NEE and photosynthetic available radiation(PAR)was a significant inverse triangle in the clear day,two different kinds of concave curves in the cloudy day,and strongly convergent rectangular hyperbola in the overcast day.These differences were controlled by the changes of light radiation and soil temperature.

net ecosystem CO2 exchangecloud amountclearness indexalpine meadow ecosystemTibetan Plateau

Fan Yuzhi、Zhang Xianzhou、Shi Peili、Wu Jianshuang

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Institute of Geographic Sciences and Resources Research,Chinese Academy of Sciences,Beijing 100101,China

Graduate University of Chinese Academy of Sciences,Beijing 100049,China

Under the auspices of the Major Basic Research Development Program of ChinaKnowledge Innovation Program of Chinese Academy of Sciences

2005CB422005KSCXZ-YW-N-44

2010

中国人口·资源与环境(英文版)
中国可持续发展研究会等

中国人口·资源与环境(英文版)

影响因子：0.117
ISSN：1004-2857
年,卷(期)：2010.8(4)
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