1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, No.189, QunXianNan Street, TianFu New Area, Chengdu 610213, China
2. University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100000, China
3. Department of Global Development, College of Agriculture and Life Sciences, Cornell University, 251A Warren Hall, Ithaca, NY 14850, USA