Ye Minsheng1, Guan Wenbin1, Bai Zhanxiong1, Ma Keming2, Liu Guohua2, Wang Xilin1
1.College of Soil and Water Conservation, Beijing Forestry University, Key Lab. of Soil and Water Conservation of Ministry of Education, 100083; 2.Key Lab. of Systems Ecology, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, 100085: Beijing, China