Key Laboratory of Freshwater Aquaculture and Enhancement of Anhui Province, Fisheries Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, China.
FEMS Microbiol Lett. 2022 Sep 20;369(1). doi: 10.1093/femsle/fnac084.
Caizi Lake is an important lake connected to the Yangtze River in Anhui Province and a crucial connection for the Yangtze-to-Huaihe Water Diversion Project. There were marked differences in trophic status of the six sampling sites based on the physicochemical characterization. The Bacterial Eutrophic Index (BEI), used to quantify water quality, was well related to Carlson's trophic state index (TSI) (Spearman's ρ = 0.829, P < 0.05). Mean TSI and BEI were 54 and 0.58, respectively, indicating that Caizi Lake was slightly eutrophic. Actinobacteriota were the predominant bacterial phylum in the water and Acidobacteriota in sediments. The diversity and composition of the bacterial community was markedly different between sites for water but not sediment samples. Unlike other Yangtze-connected freshwater lakes, the distance-based redundancy analysis revealed that dissolved oxygen affected the composition of the planktonic bacterial community (P < 0.001), while total phosphorus was the major factor in the sediments (P < 0.05). The water quality of Caizi Lake has significantly improved since a few years ago. These results contribute to the long-term monitoring of the ecological quality of the water environment along the Yangtze River to the Huaihe River.
菜子湖是安徽省连通长江的重要湖泊，也是引江济淮工程的关键节点。根据理化特性分析，6 个采样点的营养状态存在明显差异。细菌富营养指数（BEI）用于量化水质，与卡尔森营养状态指数（TSI）密切相关（Spearman ρ=0.829，P<0.05）。平均 TSI 和 BEI 分别为 54 和 0.58，表明菜子湖处于轻度富营养化状态。水体中优势的细菌门为放线菌门，而沉积物中为酸杆菌门。水样本中各采样点的细菌群落多样性和组成存在明显差异，而沉积物样本则无此现象。与其他连通长江的淡水湖泊不同，基于距离的冗余分析表明，溶解氧影响浮游细菌群落的组成（P<0.001），而总磷是沉积物的主要影响因素（P<0.05）。菜子湖的水质自数年前以来已有显著改善。这些结果有助于对长江至淮河沿线水环境生态质量进行长期监测。
