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《Chinese Journal of Atmospheric Sciences》 2017-01
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A Study of the Impact of Soil Water Conditions on Water and Carbon Dioxide Fluxes over Typical Grasslands in Inner Mongolia of China

WANG Lei;LIU Huizhi;Christian Bernhofer;LAPC,Institute of Atmospheric Physics,Chinese Academy of Science;Institute of Hydrology and Meteorology,Dresden University of Technology;  
Based on turbulence observations during the growing seasons of 2007 and 2008 in the semi-arid grasslands of Inner Mongolia, where Leymus Chinensis and Stipa Grandis are two dominant species, the characteristics of water and CO_2 fluxes under different soil water conditions and the controlling factors of these fluxes are analyzed. Results indicate that:(1) during the peak growing season on a daily time scale, the surface latent heat flux is largely dependent on soil water content under dry conditions, while it is more determined by net surface radiation under wet conditions when soil moisture content is sufficient;(2) compared with the grassland where Stipa Grandis is the dominant species, the grassland with dominant species of Leymus Chinensis has higher leaf area index, larger latent heat flux, higher CO_2 assimilation capacity and larger net CO_2 uptake under conditions with ample water in the soil. In contrast, the stomata of the grass leaf close at the Leymus Chinensis site in response to soil water stress, and the latent heat flux and the CO_2 uptake are larger atthe Stipa Grandis site. This indicates that the Stipa Grandis grassland is more drought-resistant than the Leymus Chinensis grassland;(3) the surface conductance is a key factor that can explain impacts of soil water condition on the water and CO_2 fluxes over Leymus Chinensis and Stipa Grandis grasslands.
【Fund】: 国家自然科学基金41275023、41461144001、41305012;; 德国联邦联合会资助项目“不同放牧强度对内蒙古草原生态系统物质流的影响”(MAGIM)~~
【CateGory Index】: S812
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