1. State Key Laboratory of Efficient Utilization of Arid and Semiarid Arable Land in Northern China, the Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing China
2. Yunnan Key Laboratory of Plateau Geographical Processes & Environmental Changes, Faculty of Geography Yunnan Normal University Kunming China
3. Chinese Research Academy of Environmental Sciences Beijing China
4. College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing China