1. College of Resources and Environment, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau; Northwest A&F University; Yangling P. R. China
2. Institute of Soil and Water Conservation; Chinese Academy of Sciences (CAS) & Ministry of Water Resources (MWR); Yangling P. R. China
3. United States Department of Agriculture-Agriculture Research Service (USDA-ARS); Grazinglands Research Laboratory; El Reno OK USA
4. School of Soil and Water Conservation; Beijing Forestry University; P. R. China