1. College of Tourism and Urban Planning, Chengdu University of Technology, Chengdu, Sichuan, China
2. National Park Research Center, Key Research Base of Social Sciences of Sichuan Province, Chengdu, Sichuan, China
3. State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, Chengdu University of Technology, Chengdu, Sichuan, China