1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road 18, Beijing 100085, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
4. Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650091, China