1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
2. University of Chinese Academy of Sciences, Beijing, China
3. Key Laboratory of GIS & RS Application Xinjiang Uygur Autonomous Region, Urumqi, China
4. Department of Geology and Geography, West Virginia University, Morgantown, West Virginia, United States of America
5. School of Geography, Nanjing Normal University, Nanjing, China