中文摘要：

为了探讨潮间带密秋茄树生境（树冠覆盖率高于90％）、疏秋茄树生境（树冠覆盖率低于50％）和互花米草生境之间大型底栖动物群落的差异性，2015年11月在浙江西门岛潮间带的秋茄树和互花米草生境进行了大型底栖动物定量取样．结果表明：密秋茄树和疏秋茄树生境大型底栖动物群落的物种数、生物量、多样性指数（H’）、均匀度指数（J）、丰度指数（d）和多变量海洋底栖生物指数（M-AMBI）高于互花米草生境，而秋茄树生境的大型底栖动物群落的栖息密度和海洋底栖生物指数（AMBI）低于互花米草生境．单变量单因素方差分析表明：3种生境之间大型底栖动物生物量差异有统计学意义，这与黑口滨螺（Littoraria melanostoma）的生物量有关．在密秋茄树生境未采集到黑口滨螺，在疏秋茄树生境黑口滨螺生物量低，而在互花米草生境有较高的生物量．此外，密秋茄树和疏秋茄树生境的可口革囊星虫（Phascolosoma arcuatum）、短拟沼螺（Assiminea brevicula）和光滑河蓝蛤（Potamocorbula laevis）的平均栖息密度和生物量均高于互花米草生境的，但密秋茄树和疏秋茄树生境的日本稚齿虫（Prionospio japonica）、沙蚕（Nereis sp．）和黑口滨螺的平均栖息密度和生物量则低于互花米草的．疏秋茄树生境的珠带拟蟹守螺（Cerithidea cingulata）栖息密度和生物量高于密秋茄树和互花米草生境的．上述结果证实潮间带存在大型底栖动物群落的多样性．

英文摘要：

The quantitative investigation was conducted on November 2015 in Zhejiang Ximen Island in- tertidal zone to compare benthic macrofaunal communities among the dense Kandelia obovata forest （the canopy coverage is more than 90%）,the sparse Kandelia obovata forest （the canopy coverage is less than 50% ） and the Spartina alterniflora marsh. The results showed that the species number, bio- mass,diversity index （H＇ ）, evenness index （J）, abundance index （d） and multivariate marine biotic index （M-AMBI） of benthic maerofauna communities both in the dense and sparse Kandelia obovata forests were all higher than those in the Spartina alterniflora marsh, while the density and marine bi- otic index （AMBI） of benthic macrofauna communities were lower than those in the Spartina alterni- flora marsh. One-way ANOVA showed that there were significantly differences of benthic macrofauna biomass among three habitats,which was related to the biomass of Littoraria melanostoma.Littoraria melanostoma was not found in the dense Kandelia obovata forest and the biomass of Littoraria mela- nostoma was low in the sparse Kandelia obovata forest and high in the Spartina alterniflora marsh. Moreover,the average density and biomass of Phascolosoma esculenta ,Assiminea brevicula and Pota- mocorbula laevis both in the dense and sparse Kandelia obovata forest were higher than those in the Spartina alterniflora marsh.The average densities and biomass of Prionospio japonica ,Nereis sp. and Littoraria melanostoma in the dense and sparse Kandelia obovata forest were lower than those in the Spartina alterniflora marsh.It is obvious that there are significantly differences of benthic macrofaunal communities among three habitats.Cerithidea cingulata and Assiminea brevicula are not in favor of the dense Kandelia obovata and the Spartina alterniflora habitats.