桂林喀斯特石山苔藓植物生态分布的初探

通过以桂林喀斯特石山地区苔藓植物为研究对象进行取样调查,选择植被比较完整的样地进行典型样点取样,共选取样地15处,样点34个,采集鉴定苔藓植物40种,分属19科32属,其中苔类8科8属8种,藓类11科24属32种。以山顶、山腰、山脚和土生、石生、树生以及干湿状态环境因子组合共划分出18种不同的样点环境类型,应用数学生态学等级分划分类方法的组分析技术,以苔藓植物种在某一样点环境中存在与否的二元数据进行样点类型分划和确定临界种; 并通过样点共有种或相异种的分析,探讨不同环境条件下苔藓植物生态分布特点。研究结果表明: ( 1)运用等级分划分类法组分析技术进行桂林喀斯特石山地区苔藓植物生态分布的研究是可行且有效的; ( 2)桂林喀斯特石山地区的苔藓植物分布与湿度状态关系最为密切; ( 3)桂林喀斯特石山地区苔藓植物与环境最佳适应可依次以小凤尾藓( Fissidens bryoides [ L. ] Hedw . )、尖叶提灯藓( Mnium cuspidatumHedw . )和灰羽藓( Thuidium glaucinum Mit t )作为分划特征种。 

A PRELIMINARY STUDY ON THE ECOLOGICAL DISTRIBUTION OF BRYOFLORA KARST STONE HILL IN GUILIN

Taking the bryophyte at karst area in Guilin as the object of studying, 15 patches are selected as the sampling sites where there are needed typical and completed sampling contents, and specimens are sampled in 34 spots in the sampling sites. According to living conditions at mountaintops, mountainside, the foot of the hill and in autochthonal, stone, tree and the climate, these samples can be classified into 18 types. By collecting and appraising, the bryoflora consists of 40 species (including subspecies and varieties), which belongs to 32 genera and 19 families. By applying group analysis of mathematical ecological hierarchical in divisive classification to study the ecological distribution of bryophyte, we can find the most important species that can distinguish those types. At the same time, according to the analysis of communal or different bryophytes in those types, we can understand the ecological distribution of bryophyte. The result of research shows: (1) The methods of group analysis of mathematical ecological hierarchical in divisive classification being applied to study the ecological distribution of bryophyte is feasible and effective. (2) The distribution of bryophyte has close relationship with the humidity in karst area in Guilin. (3) The most adoptive bryophyte to karst area in Guilin is Fissidens bryoides, Mnium cuspidatum and Thuidium glaucinum successively. The research can provide important base to study the ecological distributive law of bryophyte in karst area in Guilin further.