Sediment is the one of most important storage of heavy metal. Microbiotas in sediment can be used as the effective indicators of heavy metals. The goal of this study was to understand the bacterial communities responding to heavy metal enrichment in sediments and prioritize some factors that affected significantly to bacterial community. Sediments were sampled from five river-lake systems in the Poyang Lake in dry season, and the bacterial community was analyzed using Illumina high-throughput sequencing. Relationships between sediment environment and the diversity and structure of bacterial communities were determined by correlation analysis and redundancy analysis (RDA). The result indicated that Cd and Sb were identified as the heavy metals of the great risk in sediments. Sediments from five river-lake systems shared 31.83% core operational taxonomic units (OTUs) of bacterial communities. Proteobacteria (33.54% of total sequences) and Actinobacteria (15.04%) were the dominant phyla across all sites. High enrichment of heavy metals (MRI and mC_d) resulted in low diversity of bacterial communities (Simpson index). The RDA revealed pH, OC, mCd, and Efs of As, Pb, Cd were major factors related to bacterial community structure changes. The dominant phylum Actinobacteria was regarded as tolerant bacteria, while the dominant phylum Proteobacteria was named as resistant bacteria in sediment with high anthropogenic Cd enrichment.

沉积物是重金属最重要的存储之一。沉积物中的微生物群可以用作重金属的有效指示剂。这项研究的目的是了解沉积物中重金属富集的细菌群落，并确定一些对细菌群落有重大影响的因素的优先次序。在干旱季节从from阳湖的五个河湖系统中取样沉积物，并使用Illumina高通量测序对细菌群落进行了分析。通过相关分析和冗余分析（RDA）确定了沉积物环境与细菌群落多样性和结构之间的关系。结果表明，Cd和Sb被确定为沉积物中高风险的重金属。来自五个河湖系统的沉积物共有31个。变形杆菌（占总序列的33.54％）和放线菌（占15.04％）是所有位点的显性门。重金属的富集（MRI和mC _d）导致细菌群落多样性低（辛普森指数）。RDA显示pH，OC，mCd和As，Pb，Cd的Efs是与细菌群落结构变化相关的主要因素。优势门放线菌被认为是耐性细菌，而优势门变形杆菌被称为人为镉富集度较高的沉积物中的抗性细菌。