中文摘要：

通过对新疆柳叶藓科（Amblystegiaceae）、青藓科（Brachytheciaceae）和灰藓科（Hypnaceae）植物标本的野外采集和室内鉴定,报道了中国新疆地区柳叶藓科15属33种,青藓科12属51种,灰藓科11属30种,共计38属114种.其中,中国青藓科新记录种2种,新疆新记录4属37种.优势属10个,且以青藓属（Brach ythecium Brush ＆ Schimp.）为代表的北温带成分为主；单种属19个,体现了新疆藓类植物区系的古老性和多样性.新疆3科藓类植物区系成分可划分为9种类型,其中北温带成分居主导地位,占中国新疆3科藓类植物总种数的52.08％,东亚成分次之,占25.01％,热带成分甚微.对中国新疆与中国内蒙古、中国西藏以及俄罗斯、蒙古、哈萨克斯坦、巴基斯坦和印度7个邻近地区的区系比较发现,印度物种丰富度最高,俄罗斯和中国新疆次之；中国新疆与中国内蒙古、俄罗斯在物种组成上相似度最高.地理成分区系谱及聚类分析结果表明,中国新疆与中国内蒙古地区的植物区系关系最为接近,而且与俄罗斯密切相关.

英文摘要：

Based on detailed field investigation, collection of specimens and identification of Amblystegiace- ae,Brachytheciaceae and Hypnaceae in Xinjiang, we reported 114 species belonging to 38 genera. Among them,33 species of 15 genera belong to Amblystegiaceae,51 species 12 genera to Brachytheciaceae and 30 species of 11 genera to Hypnaceae. There are 4 genera and 37 species new to Xinjiang,among which 2 spe- cies reported new to China. The moss flora of Amblystegiaceae,Brachytheciaceae and Hypnaceae of Xin- jiang was divided into 9 areal-types. The total elements were dominated by North Temperate representing 52.08% of the total species,followed by East Asia element,and the tropical element is little. According to comparisons of Xinjiang and 7 neighborhoods（Tibet, Inner Mongolia, Russia, Mongolia, Kazakhstan, Paki- stan and India） ,India has the highest species richness index,followed by Russia and Xinjiang. The values of similarity coefficient of flora between Xinjiang and Inner Mongolia and Russia are higher than that of other regions. Cluster analysis of these 8 regions showed that Xinjiang has the closest relatives of flora with Inner Mongolia,and the moss flora of Xiniiang is closely associated with Russia.