Abstract
Water quality deterioration is a prominent issue threatening water security worldwide. As the largest river in China, the Yangtze River Basin is facing severe water pollution due to intense human activities. Analyzing water quality trends and identifying the corresponding driver factors are important components of sustainable water quality management. Thus, spatiotemporal characteristics of the water quality from 2008 to 2020 were analyzed by using a Mann–Kendall test and rescaled range analysis (R/S). In addition, multi-statistical analyses were used to determine the main driving factors of variation in the permanganate index (CODMn), ammonia nitrogen (NH3–N) concentration, and total phosphorus (TP) concentration. The results showed that the mean concentrations of NH3–N and TP decreased from 0.31 to 0.16 mg/L and 0.16 to 0.07 mg/L, respectively, from 2008 to 2020, indicating that the water quality improved during this period. However, the concentration of CODMn did not reduce remarkably. Based on R/S analysis, the NH3–N concentration was predicted to continue to decrease from 2020 to 2033, whereas the CODMn concentration was forecast to increase, highlighting an issue of great concern. In terms of spatial distribution, water quality in the upstream was better than that of the mid-downstream. Multi-statistical analyses revealed that the temporal variation in water quality was predominantly influenced by tertiary industry (TI), the nitrogen fertilizer application rate (N-FAR), the phosphate fertilizer application rate (P-FAR), and the irrigation area of arable land (IAAL), with contribution rates of 15.92%, 14.65%, 3.46%, and 2.84%, respectively. The spatial distribution of CODMn was mainly influenced by TI, whereas that of TP was primarily determined by anthropogenic activity factors (e.g., N-FAR, P-FAR). This study provides deep insight into water quality evolution in the Yangtze River Basin that can guide water quality management in this region.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (nos. 41807372 and 41630645), Fundamental Research Funds for the Central Universities (FRF-TP-20-059A1) and the Open Foundation of State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences (no. SKLECRA2021OFP02).
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Conceptualization, methodology, and writing–review and editing were conducted by Shasha Liu. Software, formal analysis, and writing–original draft preparation were performed by Rui Fu. The investigation was conducted by Yun Liu. Visualization was performed by Chengyu Suo. All authors read and approved the final manuscript.
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Liu, S., Fu, R., Liu, Y. et al. Spatiotemporal variations of water quality and their driving forces in the Yangtze River Basin, China, from 2008 to 2020 based on multi-statistical analyses. Environ Sci Pollut Res 29, 69388–69401 (2022). https://doi.org/10.1007/s11356-022-20667-3
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DOI: https://doi.org/10.1007/s11356-022-20667-3