1. College of Resource Environment and Tourism; Capital Normal University; Beijing China
2. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam; Potsdam Germany
3. Institute of Earth and Environment Science; University of Potsdam; Potsdam Germany
4. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research; Bremerhaven Germany
5. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography; Chinese Academy of Sciences; Urumqi China
6. College of Resources and Environmental Sciences; Xinjiang University; Urumqi China
7. University of Chinese Academy of Sciences; Beijing China