Based on an investigation of bryophytes on ten islands and one peninsula of the southeastern sub-region of the Thousand-Island Lake,the composition of bryophytes and the effects of habitat fragmentation on their diversity were studied. The results showed 129 species belonging to 71 genera and 37 families, among which 3 species were new to Zhejiang province. Geophytia, petrophytia and epixylophytia were dominant bryophyte communities. The bryoflora of the Thousand-Island Lake was characterized by East Asia elements represented by 39.45% of the entire species,followed by North Temperate elements and Tropical Asia elements which accounted for 20.18% and 18.35% .respectively. The distribution of 58 bryophyte species was affected by island area, while 29 species was unaffected. The relationship between island size and bryophyte richness showed a positive correlation.%选取浙江千岛湖东南湖区的10个岛屿和1个半岛,详细研究了苔藓植物组成及生境片断化对其多样性的影响.研究结果表明:该区域有苔藓植物37科71属129种,其中浙江新记录3种.群落类型主要包括土生群落、石生群落和树生群落.苔藓植物区系以东亚成分为主,其次为北温带成分和热带亚洲分布,分别占总种数的39.45％、20.18％和18.35％,说明该地区苔藓植物区系具有典型的东亚特征.岛屿面积对苔藓植物分布影响结果显示:不受岛屿面积影响的苔藓植物有29种,受岛屿面积影响的苔藓植物有58种；各岛屿苔藓植物物种数与岛屿累加面积存在明显正相关.
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