1. State Key Laboratory of Desert
and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049,
China
3. College of Geography
and Environmental
Science, Northwest Normal University, Lanzhou
730070, China
4. College of Resources and Environmental
Sciences, China Agricultural University, Beijing 100193, China
5. Agri-Environment
Branch, Agri-Food and Biosciences Institute, Belfast BT9 5PX,
U.K.