Risk assessment and spatial-temporal distribution characteristics of nitrogen and phosphorus emissions from agricultural sources in the Yangtze River Economic Belt.

For the lower reaches of the Yangtze River ( i.e., Jiangsu Province, Shanghai, Zhejiang Province, and Anhui Province), the proportion of LPB-derived TN pollution was extremely low and showed a decreasing trend; this pattern is closely associated with the relatively small scale of LPB operations in eastern China.

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However, our study extends the temporal scope to 2005–2020, capturing the significant reduction in 2007 linked to the “Grain-for-Green” policy—an important trend not covered by Zhu & Huang (2022) .

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