1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F Univ. Yangling PR China
2. Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), Univ. of Bayreuth Bayreuth Germany
3. Chinese Academy of Sciences and Ministry Water Resources, Inst. of Soil and Water Conservation Yangling PR China