2006年3、6、9、12月,对富春江水库大型底栖动物进行了4次采样调查.鉴定结果表明,富春江水库共发现大型底栖动物20种,平均密度为375.10 ind/m2.从群落结构上看,数量上寡毛类占优势,生物量则明显由软体动物占优势.底栖动物群落密度和生物量存在明显的季节变化,冬季及早春高,夏季低.底栖动物空间分布也存在差异,底栖动物密度除了下涯特别高以外,其他采样点差别不明显；从种类看,底栖动物的密度主要由寡毛类和多毛类组成,河流区以寡毛类为主逐渐向湖泊区以多毛类为主过渡；生物量则各区差异明显,湖泊区最大,过渡区其次,河流区最小.此外,富春江水库多毛类的密度与沉积物粒径有明显相关性.%Four times of investigations were conducted on macrobenthos in Fuchunjiang reservoir in March, June,September and December of 2006. The results indicated that there were about 20 kinds of macrobenthos in Fuchunjiang reservoir,the average density was 375. 10 ind/m2. Oligochaete was dominant in the density of the macrobenthos, however, molluscs was superior in biomass. Seasonally, the density and biomass of macrobenthos were higher in winter and early spring than in summer. In the spatial distribution, the highest density appeared in Xiaya site, and other sites were no significant difference. Oligochaete density was dominant in riverine zone but polychaeta density was dominant in lacustrine zone. The biomass of macrobenthos followed the order of lacustrine zone> transitional zone > riverine zone. There was distinct relationship between sediment pellet and density of polychaetes.
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