Phosphorus (P) is an essential element in the ecosystem and the cause of the eutrophication of rivers and lakes. The river-lake ecotone is the ecological buffer zone between rivers and lakes, which can transfer energy and material between terrestrial and aquatic ecosystems. Vegetation restoration of degraded river-lake ecotone can improve the interception capacity of P pollution. However, the effects of different vegetation restoration types on sediment P cycling and its mechanism remain unclear. Therefore, we seasonally measured the P fractions and physicochemical properties of sediments from different restored vegetation (three native species and one invasive species). The results found that vegetation restoration significantly increased the sediment total P and bioavailable P content, which increased the sediment tolerance to P pollution in river-lake ecotone. In addition, the total P content in sediments was highest in summer and autumn, but lower in spring and winter. The total P and bioavailable P contents in surface sediments were the highest. They decreased with increasing depth, suggesting that sediment P assimilation by vegetation restoration and the resulting litter leads to redistribution of P in different seasons and sediment depths. Microbial biomass-P (MBP), total nitrogen (TN), and sediment organic matter (SOM) are the main factors affecting the change of sediment phosphorus fractions. All four plants’ maximum biomass and P storage appeared in the autumn. Although the biomass and P storage of the invasive species Alternanthera philoxeroides were lower, the higher bioavailable P content and MBP values of the surface sediments indicated the utilization efficiency of sediment resources. These results suggest that vegetation restoration affects the distribution and circulation of P in river and lake ecosystems, which further enhances the ecological function of the river-lake ecotone and prevents the eutrophication and erosion of water and sediment in the river-lake ecotone.

磷（P）是生态系统中必不可少的元素，也是导致河流和湖泊富营养化的原因。河湖交错带是河湖之间的生态缓冲区，可以在陆地和水生生态系统之间传递能量和物质。退化河湖交错带植被恢复可提高对磷污染的截留能力。然而，不同植被恢复类型对沉积物磷循环的影响及其机制尚不清楚。因此，我们季节性地测量了来自不同恢复植被（三种本地物种和一种入侵物种）的沉积物的 P 分数和物理化学性质。结果发现，植被恢复显着增加了沉积物总磷和生物有效磷含量，增加了河湖交错带泥沙对磷污染的耐受性。此外，沉积物中的总磷含量在夏秋季最高，而在春季和冬季较低。表层沉积物中总磷和生物有效磷含量最高。它们随着深度的增加而减少，表明植被恢复和由此产生的凋落物对沉积物磷的同化导致磷在不同季节和沉积物深度的重新分布。微生物生物量-P（MBP）、总氮（TN）和沉积物有机质（SOM）是影响沉积物磷含量变化的主要因素。四种植物的最大生物量和储磷量均出现在秋季。虽然入侵物种的生物量和磷储存 但春季和冬季较低。表层沉积物中总磷和生物有效磷含量最高。它们随着深度的增加而减少，表明植被恢复和由此产生的凋落物对沉积物磷的同化导致磷在不同季节和沉积物深度的重新分布。微生物生物量-P（MBP）、总氮（TN）和沉积物有机质（SOM）是影响沉积物磷含量变化的主要因素。四种植物的最大生物量和储磷量均出现在秋季。虽然入侵物种的生物量和磷储存 但春季和冬季较低。表层沉积物中总磷和生物有效磷含量最高。它们随着深度的增加而减少，表明植被恢复和由此产生的凋落物对沉积物磷的同化导致磷在不同季节和沉积物深度的重新分布。微生物生物量-P（MBP）、总氮（TN）和沉积物有机质（SOM）是影响沉积物磷含量变化的主要因素。四种植物的最大生物量和储磷量均出现在秋季。虽然入侵物种的生物量和磷储存 表明植被恢复对沉积物 P 的同化和由此产生的凋落物导致 P 在不同季节和沉积物深度的重新分布。微生物生物量-P（MBP）、总氮（TN）和沉积物有机质（SOM）是影响沉积物磷含量变化的主要因素。四种植物的最大生物量和储磷量均出现在秋季。虽然入侵物种的生物量和磷储存 表明植被恢复对沉积物 P 的同化和由此产生的凋落物导致 P 在不同季节和沉积物深度的重新分布。微生物生物量-P（MBP）、总氮（TN）和沉积物有机质（SOM）是影响沉积物磷含量变化的主要因素。四种植物的最大生物量和储磷量均出现在秋季。虽然入侵物种的生物量和磷储存空心莲子草含量较低，表层沉积物生物有效磷含量和MBP值较高，表明沉积物资源利用效率较高。这些结果表明，植被恢复影响了P在河湖生态系统中的分布和循环，进一步增强了河湖交错带的生态功能，防止了河湖交错带水沙的富营养化和侵蚀。