School of Resources and Environmental Engineering, Anhui University, Hefei, Anhui Province, 230601, China; Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China; Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China.
School of Resources and Environmental Engineering, Anhui University, Hefei, Anhui Province, 230601, China; Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China; Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China.
J Environ Manage. 2019 Oct 15;248:109293. doi: 10.1016/j.jenvman.2019.109293. Epub 2019 Aug 3.
Studying the composition and structure of bacterial communities in sediments helps to understand the contribution of bacteria to environmental changes and the role of feedback in response to disturbances. However, seasonal changes in bacterial communities of river sediments with different pollution levels and sources have not been clear yet. In this study, we collected sediment samples during the dry season, wet season and level season from 40 sites with various pollution sources in three inflow rivers (Fengle-Hangbu River, Nanfei River and Zhegao River) of Chaohu Lake. Bacterial community compositions were determined based on high-throughput sequencing. The 'Bioenv' in the R package 'Vegan' and redundancy analysis was used to explore the influence of environmental factors on the bacterial community in the river sediments. Results showed that a significant deviation in bacterial communities was found among seasons and rivers. In addition, seasonal dynamics had a greater impact on shaping bacterial communities than rivers with different pollution sources. A higher diversity was found in the wet season as compared to the other seasons. The bacterial diversity was negatively correlated with nutrients (OM, TN, NH, IP, OP and TP) and metals (Cu and Zn). Bacterial communities were more sensitive to heavy metals pressure than nutrients. We also concluded that heavy metals (Cu and Cd) were the key contributing factors in explaining variations in bacterial communities. This study provided a valuable reference for assessing ecological stress.
研究沉积物中细菌群落的组成和结构有助于了解细菌对环境变化的贡献以及反馈在应对干扰时的作用。然而，不同污染水平和来源的河流沉积物中细菌群落的季节性变化尚不清楚。本研究从巢湖三条入湖河流（丰乐河-杭埠河、南淝河和柘皋河）的 40 个不同污染源地点采集了旱季、雨季和枯水季的沉积物样本。基于高通量测序，确定了细菌群落组成。利用 R 包“Vegan”中的“Bioenv”和冗余分析来探究环境因子对河流沉积物中细菌群落的影响。结果表明，季节和河流之间的细菌群落存在显著差异。此外，季节性动态对塑造细菌群落的影响大于不同污染源的河流。与其他季节相比，雨季的细菌多样性更高。细菌多样性与营养物质（OM、TN、NH、IP、OP 和 TP）和金属（Cu 和 Zn）呈负相关。细菌群落对重金属压力比营养物质更敏感。我们还得出结论，重金属（Cu 和 Cd）是解释细菌群落变化的关键因素。本研究为评估生态胁迫提供了有价值的参考。
