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《Chinese Journal of Applied Ecology》 2011-09
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Soil moisture dynamics and water balance of Salix psammophila shrubs in south edge of Mu Us Sandy Land

AN Hui1, AN Yu2 (1Ministry of Education Key Laboratory of Restoration and Reconstruction of Degraded Ecosystem in North-western China/United Center for Ecology Research and Bioresource Exploitation in Western China, Ningxia University, Yinchuan 750021, China; 2Institute of Desertification Control, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China)  
Taking the artificial sand-fixing Salix psammophila shrubs with different plant density (0.2, 0.6, and 0.8 plants·m-2) in Mu Us Sandy Land as test objects, this paper studied the soil moisture dynamics and evapotranspiration during growth season. There existed obvious differences in the soil moisture dynamics and evapotranspiration among the shrubs. The soil moisture content changed in single-hump-shape with the increase of plant density, and in "S" shape during growth season, being closely correlated with precipitation. The evapotranspiration was the highest (114.5 mm) in the shrubs with a density 0.8 plants·m-2, accounting for 90.8% of the total precipitation during growth season, and the lowest (109.7 mm) in the shrubs with a density 0.6 plants·m-2. Based on the soil moisture dynamics and water balance characteristics, the appropriate planting density of S. psammophila shrubs in Mu Us Sandy Land could be 0.6 plants·m-2.
【Fund】: 国家基础研究发展计划重点项目(2009CB426304);; 宁夏回族自治区自然科学基金项目(NZ0910);; 国家自然科学青年基金项目(31000214);; 教育部高等学校博士学科点新教师基金项目(20106401120001)资助
【CateGory Index】: S152.7
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