抚河干流浮游动物生物多样性调查及水质评价

对2010年12月与2011年7月抚河干流各监测断面中浮游动物类群的结构组成、优势类群进行了调查,并对抚河干流的水质进行了综合评价,旨在为抚河流域水质保护以及今后开展相关监测研究提供理论依据。结果表明,抚河干流浮游动物共检出4类41种,其中轮虫类最多,共计7科15属23种,占总数的56.10%;枝角类5科6属7种,占17.07%;桡足类与原生动物占26.83%。时间分布上,浮游动物丰度表现为丰水期大于枯水期,其中丰水期轮虫、枝角类、桡足类与原生动物密度分别为256、26、66、16ind/L,枯水期分别为131、8、24、10ind/L。空间分布上呈现中间小、两端大的特点,最大值出现在ST1监测站点李渡镇,最小值出现在ST3监测站点高坪。抚河干流浮游动物数量结构主要由轮虫类组成,生物量结构则主要由桡足类组成。抚河干流水质处于中富营养至富营养状况,为轻度至中度污染,污染最重的是ST3监测点高坪,最轻的是ST7监测站点南丰。

Space-time Distribution Characteristics of Zooplankton and Water Quality Assessment in the Fuhe River

To provide a basis for protecting water quality,the population structure of zooplankton was investigated in the Fuhe river in December 2010 and July 2011,and the water quality evaluation was made for the main stream.There were 41 species of zooplankton,in which rotifers were the most.Among the rotifers,a total of 7 families,15 genera and 23 species,accounted for 56.10% of the total;Cladocerans consisted of 5 families,6 genera and 7 species,accounting for 17.07%;Copepods and protozoan accounted for 26.83%.As for temporal distribution,zooplankton abundance in the high water period was greater than in the low water period.The densities of rotifers,cladocerans,copepods and protozoan were 256,26,66 and 16 ind/L respectively,in the high water period,while they were 131,8,24 and 10 ind/L respectively in the low water period.It was found that the density of zooplankton was low at middle section.From the annual average of abundance,rotifers were the highest,and protozoan was the least.From the biomass,copepods were the highest.Biodiversity and water quality assessment showed that the Fuhe river was mildly or moderately polluted.