| 典农河沉积物细菌群落结构特征及其与重金属的关系 |
| 摘要点击 697 全文点击 108 投稿时间：2023-04-17 修订日期：2023-06-30 |
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| 中文关键词 典农河 沉积物 细菌 群落特征 重金属因子 |
| 英文关键词 Diannong River sediment bacteria community characteristics heavy metal factor |
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| 中文摘要 |
| 河流沉积物细菌对有机物和营养盐的转运起着重要作用,其群落结构特征也会受到环境因子的影响.为探究典农河（上游段）沉积物细菌群落结构及其影响因子,于2021年的1、4、7和10月对典农河上游段进行沉积物样品采集调查,测定沉积物中9种重金属（Cu、Zn、Pb、Fe、Mn、As、Cr、Cd和Hg）的含量,基于16S rRNA基因扩增子高通量测序,分析典农河（上游段）不同季节沉积物细菌群落结构特征,通过冗余分析（RDA）识别典农河群落结构变化的驱动因子.结果表明,在空间上,典农河永宁段细菌物种丰度高于典农河银川段细菌物种丰度,在时间上,7月和10月细菌物种丰度高于1月和4月.典农河沉积物细菌最优势菌门为变形菌门（Proteobacteria）,较优势菌门为拟杆菌门（Bacteroidetes）和脱硫菌门（Desulfobacterota）.典农河沉积物细菌优势菌属为Sulfitobacter、Amylibacter、Planktomarina、Sulfurifustis、SUP05_cluster、Arenimonas、Candidatus_Methanoperedens、Thioalkalispira、Methylobacterium、Trichococcus、Ralstonia、MND1和Paraclostridium.采样点位中优势菌门具有显著的时间差异,细菌群落结构组成存在显著变化,但是空间差异不明显,其中,1、4和7月细菌群落结构相似度较高.不同的重金属因子在不同月份对不同的优势菌门产生影响,As和Hg影响更显著.Euyarchaeota、Bacteroidota、unidentified_Bacteria和unidentified_Archaea更易受到影响. |
| 英文摘要 |
| River sediment bacteria play an important role in the transport of organic matter and nutrients, and their community structure characteristics can be influenced by environmental factors. To investigate the sediment bacterial community structure of the Diannong River （upstream section） and its influencing factors, sediment samples were collected and investigated in the upstream section of the Diannong River in January, April, July, and October 2021. The levels of nine heavy metals （Cu, Zn, Pb, Fe, Mn, As, Cr, Cd, and Hg） in the sediments were measured. Based on high-throughput sequencing of 16S rRNA gene amplicons, the structural characteristics of sediment bacterial communities in different seasons of the Diannong River （upstream section） were analyzed. The drivers of community structure changes in the Diannong River were identified using redundancy analysis （RDA）. The results showed that the community structure of the Diannong River （upstream section） was characterized by redundancy analysis （RDA）, and the drivers of community structure changes in the Diannong River were identified. The abundance of bacterial species in the Yongning section of the Diannong River was higher than that in the Yinchuan section of the Diannong River spatially, and the abundance of bacterial species in July and October was higher than that in January and April temporally. The most dominant phylum of sediment bacteria in the Diannong River was Proteobacteria, and the other dominant phyla were Bacteroidetes and Desulfobacterota. The dominant bacterial genera in the sediment of the Diannong River were Sulfitobacter, Amylibacter, Planktomarina, Sulfurifustis, SUP05_cluster, Arenimonas, Candidatus_Methanoperedens, Thioalkalispira, Methylobacterium, Trichococcus, Ralstonia, MND1, and Paraclostridium. There were significant temporal differences in the dominant phylum in the sampled sites and significant changes in the composition of the bacterial community structure in January, April, and July, but spatial differences were not significant. The similarity of bacterial community structure was higher in January, April, and July. Different heavy metal factors affected different dominant phyla in different months, and As and Hg had more significant effects. Euyarchaeota, Bacteroidota, unidentified_Bacteria, and unidentified_Archaea were more susceptible to the effects of different heavy metal factors in different months. |
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