1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation Northwest A & F University Yangling Shaanxi China
2. Yellow River Institute of Hydraulic Research Zhengzhou Henan China
3. Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resource Yangling Shaanxi China
4. College of Urban and Environmental Sciences Northwest University Xi'an Shaanxi China