School of Geographic and Oceanographic Sciences;
the MOE Key Laboratory of Coast and Island Development;
Nanjing University;
Nanjing 210093;
China;
Institute of Desertification Studies;
Chinese Academy of Forestry;
Beijing 100091;
China;
College of Earth and Environmental Sciences;
Lanzllou University;
Lanzhou 730000;
China;
Lanzhou Institute of Arid Meteorology;
China Meteorological Administration;
Lanzhou 730020;
China;