To reveal the seasonal variations of zooplankton community and their drivers in reservoirs of the Chaobai River basin, 12 reservoir monitoring stations were deployed in September (autumn) and December (winter) of 2020, and March (spring) and June (summer) of 2021, respectively. Totally 90 zooplankton species belonging to 67 genera were identified in the four seasons, with the highest richness in summer and the lowest in spring. The mean abundance (231.5 ind./L) and biomass (0.199 mg/L) of zooplankton peaked in summer, while they were merely 60.8 ind./L and 0.075 mg/L in spring, respectively. Significant seasonal differences were observed in the structure of zooplankton community. Rotifers contributed the largest proportion of richness and abundance in autumn and summer, but the zooplankton in winter and spring were mainly dominated by protozoa. Strobilidium sp. was the most abundant species occurred in the four seasons of the reservoirs. Correlation analysis showed that the Shannon-Wiener diversity index of zooplankton was positively related with nitrite nitrogen and total organic carbon, while the richness was strongly associated with nitrate nitrogen, total nitrogen and total phosphorus. Canonical correspondence analysis exhibited that dissolved oxygen, water temperature, nitrite nitrogen, total organic carbon and conductivity were crucial in driving the seasonal distribution of zooplankton community. This study further provided supplementary data for the assessment of ecosystem health in reservoirs of the Chaobai River basin. 

为了解不同季节潮白河流域水库中浮游动物群落的结构特征及其影响因素, 分别于2020年9月(秋)和12月(冬), 2021年3月(春)和6月(夏)对12个水库监测断面的浮游动物群落开展调研。4个季度共采集并鉴定浮游动物67属90种, 其中夏季种类最丰富, 春季最少。水库浮游动物密度和生物量在夏季达到峰值, 均值分别为231.5 ind./L和0.199 mg/L; 春季浮游动物的平均密度(60.8 ind./L)和生物量(0.075 mg/L)均最低。不同季节浮游动物群落组成存在显著差异。夏秋两季浮游动物种类组成与密度组成均以轮虫为主, 冬春两季则以原生动物为主。侠盗虫在水库四季均为优势类群。相关性分析结果表明, 浮游动物Shannon-Wiener多样性指数与亚硝酸盐氮和总有机碳均显著正相关, 浮游动物丰富度则与硝酸盐氮、总氮和总磷显著正相关。典范对应分析结果表明, 溶解氧、水温、亚硝酸盐氮、总有机碳和电导率是影响浮游动物群落季节分布的主要环境因子。研究结果较全面地揭示了不同季节潮白河流域水库的浮游动物群落变化规律, 可为流域内水生态健康评估提供基础资料。