1. College of Geography Science, Qinghai Normal University, Xining 810008, China
2. Qinghai Provincial Key Laboratory of Physical Geography and Environmental Processes, Qinghai Normal University, Xining 810008, China
3. MOE Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation, Qinghai Normal University, Xining 810008, China
4. School of Cyber Security, Gansu University of Political Science and Law, Lanzhou 730070, China