Han Xiaozhuo1, Li Zizhen1,4 , Zhang Kebin2, Li Runjie3, Hui Cang1, Gao Meng4
1.Key Laboratory of Arid Agro-ecology, Ministry of Education, Lanzhou University, 730000, Lanzhou; 2.College of Soil and Water Conservation,
Beijing Forestry University, 100083, Beijing; 3.Institute of Hydrology and Electric Power of Qinghai Province, 810001, Xining; 4.Department of Mathematics & Statistics, Lanzhou University, 730000, Lanzhou: China