1. College of Management, Sichuan Agricultural University, Chengdu 611130, China
2. National Key Laboratory of Food Security and Tianfu Granary, Sichuan Agricultural University, Chengdu 611130, China
3. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
4. Sichuan Center for Rural Development Research, College of Management, Sichuan Agricultural University, Chengdu 611130, China