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《Journal of Soil Water Conservation》 2002-01
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Process and Character of Soil Degradation of Rainfed Farmland in Horqin Sandy Land

SU Yong zhong, ZHAO Ha lin, ZHANG Tong hui, LI Yu lin (Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000)  
From the aspects of physics and chemistry, the processes and characteristics of soil degradation of typical rainfed farmland in the Horqin sandy land were discussed. Results showed that in the desertification process of rainfed farmland, a series of physical and chemical properties worsened associated with losses of soil fine particle materials, including bulk density and pH raised, total porosity reduced, aeration and non capillary porosity increased, water holding capacity relented, soil organic matter, total N and P, available N and P contents decreased. One percent of silt and clay contents (0.05mm) were removed, could result in the decreases of 0.259 g/kg soil organic matter and 0.016 4 g/kg total N contents. Disturbances induced by farmers (i.e. cultivation of sandy grassland in the edge of farmland) was the main force of soil wind erosion and degradation. Two models of soil degradation process was put forward, namely, gradual degradation course and leap degradation course.
【Fund】: 国家“973”项目 (G2 0 0 0 0 4870 4)课题“沙漠化的生物过程与植被恢复重建机理”资助
【CateGory Index】: S157.1
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