三峡水库香溪河沉积物微生物群落结构对磷赋存形态的影响  

Impact of microbial community structures in sediments of Xiangxi River,Three Gorges Reservoir on phosphorus speciation

作　　者：唐朝晖 宋林旭[1,2] 罗丽娜 刘淑涵 鲍城成 朱鑫鑫 TANG Zhaohui;SONG Linxu;LUO Lina;LIU Shuhan;BAO Chengcheng;ZHU Xinxin(College of Hydraulic and Environment Engineering,China Three Gorges University,Yichang 443002,China;Hubei Field Observation and Scientific Research Station for Water Ecosystem in Three Gorges Reservoir,Yichang 443002,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]三峡水库生态系统湖北省野外科学观测研究站,湖北宜昌443002

出　　处：《环境工程》2025年第2期138-147,共10页Environmental Engineering

基　　金：国家自然科学基金青年项目“分层异重流背景下三峡水库典型支流沉积物磷迁移转化机理研究”(51909135)。

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。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.

关 键 词：三峡水库 香溪河 沉积物 微生物群落 磷形态 

分 类 号：X524[环境科学与工程—环境工程]