中文摘要：

树附生苔藓植物对环境变化极为敏感,是环境污染、气候变化及森林完整性等研究的良好生物指示物之一,研究其多样性及附生专一性具有重要意义。本文通过野外调查杭州市区内21个样点213棵胸径大于15 cm的37个树种,发现树附生苔藓植物21科38属48种。其中香樟（Cinnamomum camphora）、枫杨（Pterocarya stenoptera）、枫香（Liquidambar formosana）为最常见的附生树种。DCA排序结果发现：树附生苔藓植物种类与附生树种的相关性不明显,不同附生树种其附生苔藓植物多样性差异显著;仅发现橙色锦藓（Sematophyllum phoeniceum）与香樟联系紧密;此外,华东附干藓（Schwetschkea courtoisii）与枫杨和柱蒴绢藓（Entodon challengeri）与柿树（Diospyros kaki）表现出一定的相关性,其他树附生苔藓植物与附生树种呈散点状分布,专一倾向性极低。

英文摘要：

Epiphytic bryophytes,sensitive to the environment change,are a good biological indicator of environmental pollution,climate change and forest health. Studying the diversity and host specificity of epiphytic bryophyte has fundamental significance. Field investigations were carried out on 213 individual trees belonging to 37 species from 21 sites in Hangzhou. There were 48 species of epiphytic bryophytes,and Cinnamomum camphora,Pterocarya stenoptera,and Liquidambar formosana were the most common host trees. DCA ordination showed that the correlation between epiphytic bryophytes and tree species was not significant,and the diversity of epiphytic bryophytes affiliated with each tree was significantly different. Only one moss,Sematophyllum phoeniceum showed significant association with the host,C. camphora. There were certain correlations between Schwetschkea courtoisii and P. stenoptera,and between Entodon challengeri and Diospyros kaki. Other epiphytic bryophytes and tree species are randomly distributed,showing low host specificity.