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《Journal of Natural Resources》 2005-02
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Research on Soil Quality Change after Returning Farmland to Forest on the Loess Sloping Croplands

PENG Wen-ying1,3, ZHANG Ke-li2, CHEN Yao2, YANG Qin-ke3(1.Capital University of Economics and Business, Beijing 100070, China; 2. School of Geography, Beijing Normal University, Beijing 100875, China; 3. Institute of Soil and Water Conservation, CAS, Yangling 712100, China)  
Soil and water loss is very serious in the Loess Plateau.Converting farmland to forest or grassland is key to control soil erosion.The samples were collected at the Ansai county of Shaanxi province in China,and according to survey of the abandoned land for restoring different plant species with different restoration time,soil samples from depth intervals of 0~20cm were collected for laboratory assessment to analyzing their soil physiochemical properties.The effects of farmland conversion to forest or grassland on soil quality in the loess hilly field were studied.The results showed that soil quality significantly improved after conversion of farmland to forest or grassland.When compared to sloping farmland,vegetation restoration has resulted in significant reduction in soil bulk density and pH,and increases in soil porosity,optimum soil moisture,soil organic matter,soil carbon,nitrogen,and available soil nutrients to differing degrees.Robinia pseudoacacia has contributed most to soil quality restoration,caragana korshinskii kom comes the second,and wasteland the least.In the same time,with the increase of abandoned time,soil texture was increasingly improved,and soil organic matter, carbon,nitrogen,and available soil nutrients occurred an increasing trend.Meanwhile,the available soil nutrients increased much more than the soil elements.Thus,returning farmland to forest or grassland can not only effectively control soil erosion,but also significantly restore soil quality.
【Fund】: 中国科学院知识创新重要项目(KZCX3-SW-421);; 国家自然科学基金项目(40271072)
【CateGory Index】: S714
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