Wang Wenlong1,2,3,Wang Zhaoyin2,Lei Alin4,Tang Keli1,2,Gong Jiaguo3
1.Northwest Sci-Tech University of Agriculture and Forestry,712100,Yangling,Shaanxi;2.Tsinghua University,100084,Beijing;3.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy Sciences,712100,Yangling,Shaanxi;4.Yangtze Valley Water Resources Protection Bureau,MWR and SBEP,430051,Wuhan: China