Distribution Pattern of Epiphytic Bryophytes of Trees in Shanghai

In Shanghai,the epiphytic bryophytes of trees were investigated in 18 quadrats and found to total 43 species composed of 39 mosses and 4 liverworts.TWINSPAN and DCA were adopted to analyze their distribution pattern on the basis of their degrees of coverage.The results revealed that in Shanghai,the epiphytic bryophytes of trees could be clustered into four quadrat groups.Group Ⅰ contained seven quadrats of which six ones were located in the downtown area and 16 bryophyte species whose coverage degree amounted to 12.43%;Group Ⅱ contained four quadrats which were located in the lately developed suburb area and 11 bryophyte species whose coverage degree was 8.47% ranking the lowest;Group Ⅲ contained six quadrats located in the suburb area and 33 bryophyte species whose coverage degree was (25.82%);Group Ⅳ contained a quadrat located in Sheshan Nature Reserve and 10 bryophyte species whose converge degree was 26.42%.These indicated that the distribution of the epiphytic bryophytes of urban trees related to different habitats,environmental pollution and human disturbances to some extent.