2010年8月至2011年5月对浙江舟山东极潮间带的大型海藻进行了调查，初步查明该潮间带大型海藻的组成和分布，并利用相似性指数分析了调查海域潮间带大型海藻相似性值．结果表明：采集到的107种海藻隶属3门59属，其中绿藻门7属17种，红藻门40属73种，褐藻门12属17种．红藻门种类在调查海域的出现频率为68．2％．80．4％的调查种类分布在低潮带，其中包括一些中潮带延伸种类，中、低潮带的海藻组成相似性值为0．54．春季优势种为花石莼、孔石莼、浒苔、粗枝软骨藻、珊瑚藻、日本多管藻、萱藻、鼠尾藻、囊藻、铜藻、羊栖菜、裙带菜、网地藻、铁钉菜：夏季优势种为肠浒苔、缘管浒苔、浒苔、花石莼、石莼、孔石莼、刺松藻、珊瑚藻、粗枝软骨藻、石花菜、密毛沙菜、繁枝蜈蚣藻、拟厚膜藻、羊栖菜；秋季优势种为珊瑚藻、粗枝软骨藻、羊栖莱、长石莼、花石莼；冬季优势种为萱藻、坛紫菜、羊栖菜、珊瑚藻．铜藻生物量高达22．97kg·m^-2，鼠尾藻生物量为15．11kg·m^-2，萱藻生物量为8．41kg·m^-2，珊瑚藻优势种为1．74～2．80kg．m^-2．%Based on the survey of macro-algae in the intertidal zone of Island Dongji Zhejiang province from August 2010 to May 2011, the algal species composition and distribution are presented. The algal similarity in the sampled areas is preliminarily analyzed using Similarity indices （Sc）. A total of 107 species sampled in sublittoral area are identified, among which, 17 species of 7 genera belong to Chlorophyta, 73 species of 40 genera belong to Rhodophyta, and 17 species of 12 genera are categorized into Rhodophyta. Rhodophyta are the dominant species, with the occurring frequency being up to 68.2%. In addition, 80.4% of sampled species are collected from low-tide zone, and some are gathered from the extended area, that is, from mid-tide zone to low-tide zone. The composition comparability between mid-tide and low-tide species is found to be 0.54, and the convergence effect in mid-tide and low-tide zone is higher than that in high-tide and mid-tide zone. The sublittoral area of Dongji shows obvious vertical zoning character. The dominant species in spring season are listed in this paper in detail. Based on the experiment carried out in this work, the Biomass ofSargassum horneri is noted as high as 22.97kg·m^-2, the Biomass of Sargassum.thunbergii is 15.11kg·m^-2, the Biomass of Scytosiphon lomentarius is 8.41kg·m^-2, and the Biomass of Corallina officinalis reads 1.76-2.80kg·m^-2.
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