Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430065, China.
Int J Environ Res Public Health. 2021 Jun 29;18(13):6950. doi: 10.3390/ijerph18136950.
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 () and functional prediction analysis. It was found that had the lowest abundance in summer and the highest abundance in winter. had the lowest abundance in winter, while 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.
城市淡水湖泊在维持城市环境方面发挥着不可或缺的作用，但它们正面临着富营养化的巨大威胁。直到现在，人们对相邻城市淡水湖泊的表层水的季节性细菌群落还知之甚少。本研究报道了三个相邻淡水湖泊（即汤逊湖、野芷湖和南湖）在季节交替过程中的细菌群落。从细菌富营养指数（BEI）、细菌指标（）和功能预测分析来看，南湖的水质最好。结果表明，在夏季， 的丰度最低，而在冬季， 的丰度最高。在冬季， 的丰度最低，而在夏季， 的丰度最高。N/P 比值似乎与富营养化有一定的关系。在水温为 27°C 的夏季，具有较高平均 N/P 比值（如 N/P = 20）的汤逊湖和南湖往往具有较高的 BEI，而具有较低平均 N/P 比值（如 N/P = 14）的野芷湖则往往在水温为 9-20°C 的春季和秋季具有较高的 BEI。BEI 和水温被确定为决定湖水细菌群落的关键参数。磷似乎对细菌群落的影响略大于氮。预计本研究将有助于人们更好地了解城市湖泊富营养化问题。
