Chao Zhang1, Guobin Liu1, Sha Xue1, Guoliang Wang1, Jie Wang1, Zilin Song2
1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, PR China
2College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, PR China