Xinjiang Key Laboratory of Soil and Plant Ecological Processes,College of Grassland and Environmental Sciences,Xinjiang Agricultural University,Urumqi 830052,China;
State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;
diversity indices; overstory trees; understory herbs; paleoclimate; current climate; elevation;