【摘要】 为了更有效地治理闽江流域的非点源磷污染，文章运用土壤水分评估工具(SWAT)对闽江流域的总磷(TP)负荷进行了模拟，分析了2019-2022年的闽江流域TP污染的时空分布特征，识别出TP负荷的关键源区，评估了不同最佳管理措施方案对流域TP输出的控制效果。结果表明：（1）2019-2022年间流域TP负荷平均为3 531.6 t，年内TP负荷主要集中在丰水期(5-7月)，占全年负荷的63%，空间上呈现上游高、中下游低的特征。（2）关键源区主要集中在上游的南浦溪、崇阳溪、松溪和富屯溪等小流域，关键源区面积仅占流域总面积的17.8%，但TP负荷量却占流域总量的36.7%。（3）10 m植被缓冲带是效果最佳的单一措施，年均削减率达到36.28%，且综合措施取得的效果要优于单一措施。更多还原

【Abstract】 To better manage non-point source phosphorus pollution in Minjiang River Basin, this study employs the SWAT model to simulate the total phosphorus(TP) load. It analyzes the spatial-temporal distribution of TP pollution from 2019to 2022, key source areas of TP load, and evaluates the impacts of different best management practices on TP output. The findings indicate that the average TP load from 2019-2022 was 3 531.6 tons, mainly concentrated in the wet season(May-July), making up 63% of the annual total, with a high-load in the upper reaches and low-load in the middle and lower reaches. The key source areas are mainly concentrated in the small basins of Nanpuxi, Chongyang, Songxi and Futunxi in the upper reaches, The key source area is 17.8% of the basin area, but its TP load is 36.7% of the total. 10m vegetation buffer zone is the top-performing single measure, with a 36.28% annual reduction rate, and comprehensive measures are more effective.更多还原