【摘要】 以三峡库区支流香溪河为研究对象，在香溪河库湾布设5个样点，采集不同时期香溪河沉积物样品，分析沉积物中磷形态，并结合沉积物理化因子和微生物群落结构，探究沉积物微生物群落结构的变化与磷赋存形态的关系。结果表明：香溪河沉积物总磷含量为324.21～1385.05 mg/kg,平均值为869.56 mg/kg,其中HCI-P是沉积物中主要磷形态；沉积物中主要优势菌群为Proteobacteria、Cyanobacteria和Bacteroidota; Proteobacteria相对丰度与OP和HCI-P呈显著负相关，Proteobacteria中优势解磷菌属可促进HCI-P和OP的溶解释放；Cyanobacteria相对丰度与OP和NaOH-P呈显著负相关，Cyanobacteria通过正反馈作用促进沉积物中OP以及NaOH-P的释放；Desulfobacterota相对丰度与NaOH-P呈显著负相关，Desulfobacterota中的Geothermobacter可通过Fe还原促使NaOH-P的释放。更多还原

【Abstract】 The forms of phosphorus in sediments are influenced by various physical, chemical, and biological factors, with microorganisms playing a key role in driving the migration and transformation of phosphorus in sediments. However, studies on the impact of microorganisms on phosphorus forms in sediments remain insufficient. This study focused on the Xiangxi River, a tributary of the Three Gorges Reservoir, by establishing five sampling sites in the river’s bay. Sediment samples were collected during different periods to analyze phosphorus forms and to explore the relationship between changes in sediment microbial community structure and phosphorus storage forms in conjunction with physicochemical factors of the sediments. The results indicated that the total phosphorus content in the sediments of the Xiangxi River ranged from 324.21 mg/kg to 1385.05 mg/kg, with an average content of 869.56 mg/kg, where HCl-P was the dominant phosphorus form. The main dominant microbial communities in the sediments were Proteobacteria, Cyanobacteria, and Bacteroidota. Proteobacteria’s relative abundance showed a significant negative correlation with OP and HCl-P, and the dominant phosphorus-reducing genera within Proteobacteria can enhance the dissolution and release of HCl-P and OP. Cyanobacteria’s relative abundance exhibited a significant negative correlation with OP and NaOH-P, promoting the release of OP and NaOH-P through positive feedback mechanisms. Desulfobacterota’s relative abundance showed a significant negative correlation with NaOH-P, with Geothermobacter in Desulfobacterota facilitating the release of NaOH-P through iron reduction.更多还原