1. China Western Economic Research Center, Southwestern University of Finance and Economics, Chengdu, People’s Republic of China
2. College of Geography and Resources, Sichuan Normal University, Chengdu, People’s Republic of China
3. Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education, Sichuan Normal University, Chengdu, People’s Republic of China
4. School of Finance, Southwestern University of Finance and Economics, Chengdu, People’s Republic of China