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《Acta Agrestia Sinica》 2003-04
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Soil Water Regulation of the Natural Grassland of Semi-Arid Loess Hilly Region

CHENG Ji-min, WAN Hui-e, WANG Jing, YONG Shao-ping (Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Northwest Science and Technology University of Agriculture and Forestry, Yangling, Shanxi Province, 712100, China)  
A Study of the depletion and restoration of soil water in closed and non-closed natural grassland of the semi-arid loess hilly region shows that with normal rainfall, the yearly fresh yield on the closed grassland amounts to 5860.7 kg/hm~2 while that of the non-closed grassland is only 785.4 kg/hm~2. During the plant growing period,compensatory water for the closed grassland totalled 39.4 mm, and for the non-closed one,29.2 mm.In an abundant precipitation year,the grassland's dry substance yield averaged 2.65 kg/(hm~2·mm); in a mormal precipitation year,1.94 kg/(hm~2·mm), and merely 0.64 kg/(hm~2·mm) in a scanty precipitation year. In the non-closed grassland,construction of water-storing ditches and wells had increased the water conent of soil of 0~500 cm depth 11.5%~13.5% in 13 years (1987~1999), 3%~5.2% higher than the grassland without constructing any water-storing projects, and had increased the fresh yield by 5~8 times. The soil water regulation plans promote the growth of plant and raise the grassland yield.
【Fund】: 资助项目:国家"十五"科技攻关(2001BA508B19)课题;; 国家重点基础研究发展规划"973"项目(G2000018606);; 国家高技术研究发展计划(863计划项目2002AA6Z3301);; 国家自然科学基金重点项目(30230290)资助
【CateGory Index】: S154.3
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