1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. State Key Laboratory of Grassland Agro-Ecosystems, College of Ecology, Lanzhou University, No. 222, South Tianshui Road, Lanzhou 730000, China
4. Changwang School of Honour, Nanjing University of Science and Technology, Nanjing 210044, China