Abstract
A better understanding of the relationships between non-point source (NPS) pollution–related processes and their drivers will help to develop scientific watershed management measures. Although various studies have explored the drivers’ impact on NPS pollution–related processes, quantitative knowledge of the properties within these relationships is still needed. This study uses the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model to produce three related processes of NPS pollution, quick flow (QF), nitrogen export (NE), and sediment export (SE), in the upstream watershed of Chaohu Lake, China. The spatial distributions of QF, NE, and SE and their responses to multiple natural-socioeconomic drivers at nine spatial scales (1 km2, 10 km2, 20 km2, 30 km2, 50 km2, 75 km2, 100 km2, 200 km2, and town) were compared. The results showed that the spatial scale has little impact on the spatial distributions of NPS pollution–related processes. Across the nine scales, the socioeconomic drivers related to agricultural activities, area proportions of cultivated land (cultivated) and paddy field (paddy), have dominant impacts on NE, while the topographical drivers, the connectivity index (IC) and slope, have dominant impacts on both SE and QF. The magnitudes of single and paired natural-socioeconomic drivers’ impacts on NPS pollution–related processes increase logarithmically or linearly with increasing spatial scale, but they tend to reach a stable threshold at a certain coarse scale. Our results emphasized the necessity and importance of embracing spatial scale effects in watershed water environmental management.
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Yingxia Li: term, conceptualization, writing—original draft, writing—review & editing, supervision. Tingting Duan: term, conceptualization, methodology, software, validation, formal analysis, investigation, data curation, writing—original draft, writing—review & editing, visualization.
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Duan, T., Li, Y. A multiscale analysis of the spatially heterogeneous relationships between non-point source pollution–related processes and their main drivers in Chaohu Lake watershed, China. Environ Sci Pollut Res 30, 86940–86956 (2023). https://doi.org/10.1007/s11356-023-28233-1
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DOI: https://doi.org/10.1007/s11356-023-28233-1