Beijing Research & Development Center for Grass and Environment;
Beijing Academy of Agriculture and Forestry Sciences;
Beijing 100097 (China);
State Key Laboratory of Soil Erosion and Dryland Farmning on the Loess Plateau;
Institute of Soil and Water Conservation;
Chinese Academy of Sciences;
Yangling 712100 (China);
Colleqe of Forest;
Guizhou University;
Guiyang 550025 (China);