Key Laboratory of Biogeography and Bio-resources in Arid Land;
Xinjiang Institute of Ecology and Geography;
Chinese Academy of Sciences;
Urumqi 830011;
China;
Graduate University of Chinese Academy of Sciences;
Beijing 100049;
China;
Asia Ecological Consultants Ltd;
Hong Kong;
China;
Sunbird. Bedfordshire. SG 19 1DF. UK;