杭州湾期间带生态学研究──Ⅲ．群落结构

Studies on intertidal zone ecology of Hangzhou Bay ──Ⅲ. community structure

根据盐度、底质、潮流等环境生态因子及群落结构的差异，结合相似性比较及聚类分析，杭州湾潮间带生物群落可划分为三个类型：湾底群落、湾中群落和湾口群落。从湾底向湾口。群落多样性指数Ｈ＇（Ｓ），丰度ｄ值皆呈增大趋势，而优势度Ｄ值逐步减小，表明群落结构从湾底到湾。由简单趋向复杂。焦河篮蛤为杭州湾湾口潮间带底栖生物群落的特征种。

According to salinity, substratum and tide flow etc. environmental factors, to compare the similarity and analyse the gathering variety in a combination way, the biomass of intertidal zone in Hangzhou Bay can be classified into three types: bay-bottom community, bay community and bay-mouth community. From the bottom to the mouth of the bay, the values of diversity index H' (S) and species abundance d of community present an increasing trend, and the values of dominance D decrease gradually, these values indicate that the community structure turns simple towards complicated from bay bottom to bay mouth. Potamocorbula ustulata (Reeve) is a characteristic species of community of soft phase intertidal zone in bay mouth.