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首页> 外文期刊>Frontiers of environmental science & eng >Diversity and vertical distributions of sediment bacteria in an urban river contaminated by nutrients and heavy metals
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Diversity and vertical distributions of sediment bacteria in an urban river contaminated by nutrients and heavy metals

机译：营养和重金属污染的城市河流中沉积物细菌的多样性和垂直分布

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摘要

The aim of this study was to investigate the benthic bacterial communities in different depths of an urban river sediment accumulated with high concentrations of nutrients and metals. Vertical distributions of bacterial operational taxonomic units (OTUs) and chemical parameters (nutrients: NH_4~+, NO_3~-, dissolved organic carbon, and acid volatile sulfur; metals: Fe, Zn, and Cu) were characterized in 30 cm sediment cores. The bacterial OTUs were measured using the terminal restriction fragment length polymorphism analysis. Biodiversity indexes and multivariate statistical analyses were used to characterize the spatial distributions of microbial diversity in response to the environmental parameters. Results showed that concentrations of the nutrients and metals in this river sediment were higher than those in similar studies. Furthermore, high microbial richness and diversity appeared in the sediment. The diversity did not vary obviously in the whole sediment profile. The change of the diversity indexes and the affiliations of the OTUs showed that the top layer had different bacterial community structure from deeper layers due to the hydrological disturbance and redox change in the surface sediment. The dominant bacterial OTUs ubiquitously existed in the deeper sediment layers (5-27 cm) corresponding to the distributions of the nutrients and metals. With much higher diversity than the dominant OTUs, the minor bacterial assemblages varied with depths, which might be affected by the sedimentation process and the environmental competition pressure.
机译：这项研究的目的是调查城市河流沉积物中不同深度的底栖细菌群落，这些沉积物中积累了高浓度的养分和金属。在30 cm的沉积岩心中表征了细菌操作分类单位（OTU）和化学参数（营养素：NH_4〜+，NO_3〜-，溶解的有机碳和酸挥发性硫；金属：Fe，Zn和Cu）的垂直分布。使用末端限制性片段长度多态性分析来测量细菌OTU。利用生物多样性指数和多元统计分析来表征响应于环境参数的微生物多样性的空间分布。结果表明，该河流沉积物中的养分和金属的浓度高于类似研究中的浓度。此外，沉积物中还表现出很高的微生物丰富性和多样性。在整个沉积物剖面中，多样性没有明显变化。 OTUs的多样性指数和隶属关系的变化表明，由于表层沉积物的水文扰动和氧化还原变化，顶层与深层细菌群落结构不同。占优势的细菌OTU普遍存在于较深的沉积物层（5-27厘米）中，与营养物和金属的分布相对应。与主要OTU相比，多样性要高得多，次要细菌群落随深度而变化，这可能受沉积过程和环境竞争压力的影响。

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  • 来源
    《Frontiers of environmental science & eng》 |2013年第6期|851-859|共9页
  • 作者

    Xunan YANG; Shan HUANG; Qunhe WU; Renduo ZHANG; Guangli LIU;

  • 作者单位

    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    heavy metals; nutrients; sediment profile; terminal restriction fragment length polymorphism;

    机译：重金属;营养素沉积物剖面末端限制片段长度多态性;

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