1. School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
2. College of Eco-Environment, Hebei University, Baoding 071000, China
3. Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071000, China
4. College of Resources and Environment, Shanxi University of Finance and Economics, Taiyuan 030006, China
5. Chinese Research Academy of Environmental Sciences, Beijing 100012, China