1. a Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan, China
2. b Chongqing Eco-environment Monitoring Station of Soil and Water Conservation, Chongqing 401147, China
3. c University of Chinese Academy of Sciences, Chengdu, Sichuan, China
4. d Present/permanent address: No. 9, 4th Section, South Renmin Road, Wuhou District, Chengdu, Sichuan, China