1. Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Yunnan Normal University, Kunming, Yunnan 650500, China
2. Yunnan Provincial Renewable Energy Engineering Key Laboratory, Yunnan Normal University, Kunming, Yunnan 650500, China
3. School of Mathematics and Statistics, Chuxiong Normal University, 546 Lucheng South Rd, Chuxiong 675000, China
4. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
5. School of Ecology and Environmental Sciences, Yunnan University, 2 North Cuihu Rd, Kunming 650091, China