1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2. Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research (CAS), Beijing 100101, China
4. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China