1. Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental SciencesLanzhou University Lanzhou 730000 China
2. Agronomy DepartmentPurdue University, and USDA‐ARS National Soil Erosion Research Lab. 275 South Russell Street West Lafayette Indiana 47907‐2077 USA
3. College of Science, Northwest Agriculture & Forester University Yangling 712100 China
4. Economics and Business AdministrationChongqing University Chongqing 400030 China
5. Cryosphere Research Station on the Qinghai‐Tibet Plateau, State Key Laboratory of Cryosphere SciencesNorthwest Institute of Eco‐Environment and Resources, Chinese Academy of Sciences Lanzhou 730000 China