分水江流域秋季浮游动物群落特征分析

Analysis of the characteristics of zooplankton communities in the autumn season in the Fenshui River Basin

为了解分水江流域秋季浮游动物分布特征,于2021年10月在分水江流域设置35个采样点,分别为分水江上游、分水江干流和分水江支流。对分水江流域进行浮游动物群落调查,并利用生物多样性指数对水质进行评价。结果显示:分水江流域共检测出浮游动物4类74种(属),其中原生动物24种;轮虫种类数量为28种,枝角类8种,桡足类14种;分水江流域浮游动物密度变化在3.00~492.50 ind./L,生物量变化范围在0.000 1~40.626 0 mg/L之间;采用浮游动物密度进行聚类分析显示,分水江流域各采样点浮游动物可分为3大类群。采样点位多样性指数(H′)、均匀度指数(J)、丰富度指数(D)平均值分别为1.83、0.93和1.01。根据生物种多样性指数结果对水质状况进行综合评价,结果表明分水江流域水环境质量处于轻-中度污染,分水江水库浮游动物特征差异明显,因此,需要进一步加强监测管理。

In order to understand the distribution characteristics of zooplankton in the Fenshui River Basin during autumn,35 sampling points were set up in the basin in October 2021.These sampling points were located in the upper reaches of the Fenshui River,the main stream of the Fenshui River,and its tributaries.A survey of plankton communities was conducted in the Fenshui River Basin,and water quality was assessed using biodiversity indices.The results showed that a total of 74 species from 4 classes of zooplankton were detected in the Fenshui River Basin,including 24 species of protozoa.The most abundant group was rotifers with 28 species,followed by cladocerans with 8 species and copepods with 14 species.The density of zooplankton in the Fenshui River Basin ranged from 3.00 to 492.50 ind./L,and the biomass ranged from 0.0001 to 40.6260 mg/L.Cluster analysis based on zooplankton density revealed that the sampling points in the Fenshui River Basin could be divided into 3 major groups.Based on the results of biodiversity indices,the water quality in the Fenshui River Basin was evaluated to be lightly to moderately polluted.There were significant differences in zooplankton characteristics in the Fenshui Reservoir,indicating the need for further monitoring and management.