Abstract
Baiyangdian Lake (BYD), a large shallow lake in North China, has complex water landscape patterns that are underlies spatial variations in water quality. In this study, we collected 61 water samples from three water landscapes (reed littoral zones, fish ponds, and open water) and analyzed them for water quality parameters, such as dissolved organic carbon (DOC), total nitrogen (TN), and total phosphorus (TP). Water landscape distribution (determined using remote sensing imagery) was then used to assess correlations between water quality parameters and water landscape proportion in differently scaled buffer zones. There was substantial variation across all subareas, with TN and TP concentrations ranging from 0.90 to 4.10 mg/L and 0.06 to 0.18 mg/L, respectively, in class IV of water quality as a whole. Spatial variations in water quality were mainly caused by water landscape distribution and external nutrient inputs. There were negative correlations between DOC, TN, and TP concentrations and the area proportion of reed littoral zones in the 300 and 500 m buffers. In contrast, DOC, TN, and TP concentrations were significantly positively correlated with the area proportion of fish ponds in the 100 m buffer. Furthermore, compared with reed littoral zones, a lower ratio of nitrogen to phosphorus and a higher proportion of dissolved organic nitrogen and tyrosine-like proteins were found in fish ponds. These effects were mainly attributed to the development of internal sediment loadings due to nutrient exchange across the sediment–water interface. Therefore, dredging-based sediment removal from fish ponds should be considered to suppress internal phosphorus loading and accelerate recovery of the BYD ecosystem.
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This research was supported by the Major Science and Technology Program for Water Pollution Control and Treatment (2018ZX07110004).
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All authors contributed to the study conception and design. Liqing Li gave the idea of this research work. Material preparation, data collection, and analysis were performed by Liqing Li and Xinghong Chen. The first draft of the manuscript was written by Liqing Li and Xinghong Chen. Meiyi Zhang, Weijun Zhang, Dongsheng Wang, and Hongjie Wang helped the work with his ideas and made a critical editing and reviewing of the whole manuscript. All authors read and approved the final manuscript.
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Li, L., Chen, X., Zhang, M. et al. The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China. Environ Sci Pollut Res 29, 16716–16726 (2022). https://doi.org/10.1007/s11356-021-16938-0
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DOI: https://doi.org/10.1007/s11356-021-16938-0