Urban freshwater lakes play an indispensable role in maintaining the urban environment and are suffering great threats of eutrophication. Until now, little has been known about the seasonal bacterial communities of the surface water of adjacent freshwater urban lakes. This study reported the bacterial communities of three adjacent freshwater lakes (i.e., Tangxun Lake, Yezhi Lake and Nan Lake) during the alternation of seasons. Nan Lake had the best water quality among the three lakes as reflected by the bacterial eutrophic index (BEI), bacterial indicator (Luteolibacter) and functional prediction analysis. It was found that Alphaproteobacteria had the lowest abundance in summer and the highest abundance in winter. Bacteroidetes had the lowest abundance in winter, while Planctomycetes had the highest abundance in summer. N/P ratio appeared to have some relationships with eutrophication. Tangxun Lake and Nan Lake with higher average N/P ratios (e.g., N/P = 20) tended to have a higher BEI in summer at a water temperature of 27 °C, while Yezhi Lake with a relatively lower average N/P ratio (e.g., N/P = 14) tended to have a higher BEI in spring and autumn at a water temperature of 9–20 °C. BEI and water temperature were identified as the key parameters in determining the bacterial communities of lake water. Phosphorus seemed to have slightly more impact on the bacterial communities than nitrogen. It is expected that this study will help to gain more knowledge on urban lake eutrophication.
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机译：城市淡水湖泊在维护城市环境中发挥不可或缺的作用，遭受富营养化的巨大威胁。到目前为止，对邻近淡水城市湖泊的地表水的季节性细菌群落毫无疑问。本研究报告了在季节交替期间的三个相邻的淡水湖（即唐勋湖，叶芝湖和南湖）的细菌群落。由细菌富营养指数（BEI），细菌指示剂（叶氏曲杆菌）和功能预测分析反映的三湖中，南湖具有最好的水质。发现alphaprooteobacteria在夏季的丰富最低，冬季最高的丰富。冬季，Bacterodetes的丰富率最低，而Prousctomycetes在夏天的丰富度最高。 N / P比似乎与富营养化有一些关系。唐龙湖和南湖平均水平较高（例如，N / P = 20）往往在夏季在27°C的水温下具有更高的北极，而叶芝湖平均下行率相对较低（例如，n / p = 14）倾向于在9-20℃的水温下在春季和秋季具有更高的贝。北极和水温被鉴定为确定湖水细菌群落的关键参数。磷似乎对细菌群体的影响略微比氮对细菌群体更多。预计这项研究将有助于获得更多关于城市湖富营养化的知识。
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