1. College of Environment and Resources, Shanxi University, Taiyuan 030006, China
2. Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, CAS, Shijiazhuang 050021, China
3. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
4. School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China