1. College of Natural Resources and Environment Northwest A&F University Yangling Shaanxi China
2. 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
3. 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 Shaanxi China
4. Department of Hydrology and Water Resources Management, Institute of Natural Resources Conservation Kiel University Kiel Germany