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JIA Yanhong1; ZHAO Jun2;NAN Zhongren1;ZHAO Chuanyan3;WANG Shengli1
1Institute of Resource and Environment, Lanzhou University, Lanzhou 730000, China; 2College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China;3Cold and Arid Regions Environment and Engineering Research Institute, China Academy of Sciences, Lanzhou 730000, China