Lingxue Yu, Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun, China; University of California, Los Angeles, Geography, Los Angeles, CA, United States, Yongkang Xue, Univ California Los Angeles, Los Angeles, CA, United States, Ye Liu, University of California Los Angeles, Geography, Los Angeles, CA, United States and Ismaila Diallo, University of California Los Angeles, Los Angeles, CA, United States