1. Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450003, China
2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
4. Board of Investment, Colombo P.O. Box 1768, Sri Lanka
5. School of Resources and Environment, Nanchang University, Nanchang 330031, China