1. College of Water Resources and Civil Engineering; China Agricultural University; Beijing P. R. China
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources; Yangling Shanxi Province P. R. China
3. China Institute of Water Resources and Hydropower Research; Beijing P. R. China
4. College of Resource and Environment; Xizang Agriculture and Animal Husbandry College; Linzhi Tibet Autonomous Region P. R. China