Relations between carbon dioxide fluxes and environmental factors of Kobresia humilis meadows and Potentilla fruticosa meadows |
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Authors: | Liang Zhao Shixiao Xu Yingnian Li Yanhong Tang Xinquan Zhao Song Gu Mingyuan Du Guirui Yu |
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Institution: | 1. Northwest Plateau Institute of Biology, Chinese Academy of Science, Xining, 810001, China 5. Key Laboratory of Adaption and Evolution of Peatean Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xin’ging, 810001, China 2. National Institute for Environmental Studies, Tsukuba, Ibaraki, 3050053, Japan 3. National Institute for Agro-Environmental Science, Tsukuba, Ibaraki, 3058604, Japan 4. Institute of Geographic Sciences and Natural Resources Research, Beijing, 100101, China
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Abstract: | Carbon dioxide fluxes of Kobresia humilis and Potentillafruticosa shrub meadows,two typical ecosystems in the Qinghai-Tibet Plateau,were measured by eddy covariance technology and the data collected in August 2003 were employed to analyze the relations between carbon dioxide fluxes and environmental factors of the ecosystems.August is the time when the two ecosystems reach their peak leaf area indexes and stay stable,and also the period when the net carbon absorptions of Kobresia humilis and Potentilla photo flux densities (PPFD),the carbon dioxide-uptake rate of the Kobresia humilis meadow is higher than that of the Potentilla fruticosa shrub meadow;where the PPFD are rates of the two ecosystems declined as air temperature increased,but the carbon dioxide uptake rate of the Kobresia humilis meadow decreased more quickly (-0.086) than that of the Potentilla fruticosa shrub meadow (-0.016).Soil moistures exert influence on the soil respirations and this varies with the vegetation type.The daily carbon dioxide absorptions of the ecosystems increase with increased diurnal temperature differences and higher diurnal temperature differences result in higher carbon dioxide exchanges.There exists a negative correlation between the vegetation albedos and the carbon dioxide fluxes. |
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Keywords: | alpine meadow vegetation type net carbon dioxide exchange eddy covariance technology |
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