Acknowledgments
The authors would like to thank the staff of Nanjing University for the sampling program in Huaihe River Basin and Nanhui Environmental Monitoring Central Station for the sampling program in Dishui Lake. The authors gratefully acknowledge anonymous reviewers. This project was supported by the National Key Special Project of Sci-tech for Water Pollution Control and Management (No.2012ZX07501002-003) and the Education Department of Hainan Province (Hnky2020-60) .