上海市树附生苔藓植物分布格局研究

Distribution Pattern of Epiphytic Bryophytes of Trees in Shanghai

在对上海市18个样点的树附生苔藓植物种类与盖度样方调查基础上,报道了43种树附生苔藓植物,其中藓类39种,苔类4种.根据盖度值应用双向指示种分析法(TW IN SPAN)和除趋势对应分析(DCA)对其分布格局进行了分析.结果表明,上海市树附生苔藓植物可聚类为4个样点组:样点组Ⅰ为7个样点,6个位于市中心,共有树附生苔藓16种,总盖度为12.43%;样点组Ⅱ为市郊样地年龄较年轻的4个样点,共有树附生苔藓11种,总盖度最小为8.47%;样点组Ⅲ为市郊6个样点,共有树附生苔藓33种,总盖度为25.82%;样点组Ⅳ为佘山自然保护区一处,共有树附生苔藓10种,总盖度为26.42%.结果反映了城市树附生苔藓植物分布与不同生境、环境污染及人为干扰有一定的相关性.

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.