1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco‐Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085 China
2. University of Chinese Academy of Sciences, Beijing, 100049 China
3. Centre for Ecology & Hydrology, Maclean Building, Crowmarsh Gifford Wallingford, Oxon, OX10 8BBUK
4. China National Environmental Monitoring Center, Beijing, 100012 China