1. Academy of Plateau Science and Sustainability, Qinghai Normal University, Xining, China
2. School of Geographical Sciences, Qinghai Normal University, Xining, China
3. School of Agriculture and Forestry Economics and Management, Lanzhou University of Finance and Economics, Lanzhou, China
4. State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing, China
5. School of Management, Guangdong University of Technology, Guangzhou, China