State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China;
Ili Station for Watershed Ecosystem Research Chinese Academy of Sciences Xinyuan 835800 China;
Research Center for Ecology and Environment of Central Asia Chinese Academy of Sciences Urumqi 830011 China;
Xinjiang Regional Center of Resources and Environmental Science Instrument Chinese Academy of Sciences Urumqi 830011 China;