1. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, P. R. China
2. Ningbo Urban Environment Observation and Station, Chinese Academy of Sciences, Ningbo 315800, P. R. China
3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
4. Center for Applied Geosciences (ZAG), Eberhard Karls University Tuebingen, Sigwartstrasse 10, Tuebingen D-72076, Germany
5. Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330012, P. R. China
6. Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China