Jin Fang1,2 , Lu Shaowei1, Yu Xinxiao1, Rao Liangyi1, Zhang Zhenming1, Mao Fuling3
1.Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education, College of Soil and Water Conservation, Beijing Forestry University, 100083; 2.Department of Science and Technology, State Forestry Brueau, 100714: Beijing; 3.Hebei Provincial Forestry Brueau, 050081, Shijiazhuang: China