沈阳市地面苔藓植物的分布及对环境因子的响应

Distribution patterns of floor bryophytes in Shenyang and the influence of environmental factors

应用双向指示种分析法（TwINSPAN）和除趋势对应分析法（DCA），对沈阳市57种苔藓植物分布格局进行了分析。结果将20个样点划分为三个组，其中组1样点所含种类不足10种：组2在10-20种之间：而组3多在20种以上。从组1到组3，物种丰富度逐渐增加；分类与排序的结果与样点的实际物种分布特点基本一致。采用典范对应分析（CCA）对其中20个样点的35种主要地面苔藓植物与环境因子间的关系进行了分析。发现土壤含水量、人为干扰度和乔木层郁闭度是影响沈阳市苔藓植物分布的主要因素。同时根据环境因子的影响，将沈阳市主要地面苔藓植物分为两类，其中第一类多为顶蒴藓类；而第二类则主要为侧蒴藓类。

57 bryophytes＇ distribution patterns were analyzed by using TWINSPAN and DCA, based on the extensive field bryophytes ecological survey in Shenyang. The results showed that sites could be divided into three groups. There are less than 10 species in group one; 10-20 species in group two and more than 20 species in group three. The biodiversity of bryophytes got richer one by one from group one to group three. The results of classification and ordination are consistent with the actual situation of bryophytes distribution. CCA was applied to study the relationships between 35 main bryophytes species and their environmental factors in 20 sample sites. It indicates that soil water content, human disturbance, and canopy density have important impact on bryophytes distribution in Shenyang. In addition, according to the influence of environmental factors, the species could be divided into two groups, and one group mainly contains acrocarpous mosses, while the aother chiefly includes pleuroearpous mosses.