1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau/College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China
2. Qin Ling National Botanical Garden, Xi’An, Shaanxi, China
3. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China
4. Chinese Academy of Sciences and Ministry of Water Resources, Institute of Soil and Water Conservation, Yangling, Shaanxi, China