1. Key Laboratory of Water Sediment Sciences, College of Water Sciences; Beijing Normal University; Beijing China
2. Key Laboratory of Soil and Water Conservation and desertification combating, College of Soil and Water Conservation; Beijing Forestry University; Beijing China
3. Department of Geography; Durham University; Durham UK
4. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau; Institute of Soil and Water Conservation, Chinese Academy of Sciences; Yangling Shaanxi China