1. Institute of Soil and Water Conservation, Northwest A&F University Yangling PR China
2. Research Center on Soil and Water Conservation, Ministry of Water Resources Yangling PR China
3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources Yangling PR China
4. Department of Geography, Environment and Geomatics University of Guelph Guelph Ontario Canada
5. College of Water Resources and Architectural Engineering, Northwest A&F University Yangling PR China