【摘要】 为了分析水体中浮游生物群落的时空变化特征，对2018年11月—2019年12月南水北调天津干线箱涵输水的浮游生物群落进行调查。在天津干线沿线设置了5个监测点，共鉴定到浮游植物4门38属。其中绿藻17属，占总属类数的44.7%，而硅藻对浮游植物密度的贡献最大。曲壳藻（Achnanthes）与桥弯藻（Cymbella）为全年出现次数最多的浮游植物优势属；浮游动物中桡足类1属1种、枝角类5属7种、轮虫11属13种，优势种为汤匙华哲水蚤（Sinocalanus dorrii）。另外，基于浮游生物群落结构、丰度、多样性综合指数等对天津干线总体水质进行了评价，判断出其总体营养状态处于贫-中营养型，污染程度属于寡污-中污型。同时分析了水体中浮游生物群落的时空变化特征，并对造成变化的原因进行了讨论。更多还原

【Abstract】 This paper set up five monitoring points along the Tianjin trunk line to investigate the plankton communities in the box culvert of South-to-North Water Diversion Project from November 2018to December 2019, so as to analyze the temporal and spatial variation of plankton community in the water body. A total of 4 phyla and 38 genera of phytoplankton were identified. Among them, 17 genera of Chlorophyta accounted for 44.7% of the total genera, and Bacillariophyta contributed the most to phytoplankton density. Achnanthes and Cymbella were the dominant genera of phytoplankton with the highest annual occurrence. Among the zooplankton, there were 1 genus and 1 species of Copepoda, 5genera and 7 species of Cladocera, and 11 genera and 13 species of rotifers. The dominant species was Sinocalanus dorrii. In addition, the overall water quality of Tianjin trunk line was evaluated based on the phytoplankton community, abundance and diversity index. The overall nutritional status of Tianjin trunk line was poor to medium trophic type, and the degree of pollution belonged to the type of oligopollutionmoderate pollution. The spatial and temporal variation characteristics of the plankton community in the water body were analyzed, and the causes of the variation were discussed.更多还原