极小种群植物丹霞梧桐群落的地理区系成分分析

Analysis on Geographical Elements of the Community of Plant Species with Extremely Small Populations Firmiana danxiaensis

丹霞梧桐主要分布于广东韶关市仁化县丹霞山国家级自然保护区.在丹霞梧桐群落中设置了11个10m×10m的样方,样方中记录维管植物48种,隶属27科46属.其中,被子植物占绝对优势,蕨类植物仅2种,缺乏裸子植物.从科、属、种三水平进行的地理区系成分分析均显示,该区以热带-亚热带成分为主,亦有一定比例的温带成分.整体来看,本区植物区系具有明显的南亚热带北缘性质.

Firmiana danxiaensis distributes only in Danxiashan National Shaoguan City, Guangdong Province. Eleven plots of 10 m＊10 m were set Nature Reserve, up for the survey Renhua County, of the community characteristics of Firmiana danxiaensis. There were 48 species of vascular plant in 46 genera of 27 families in plots,in which angiosperms was dominant type, pteridophytes only including 2 species, gymnosperms was absent. From the analysis of the floristic geographical elements at three levels （family, genus, and species）, the flora was dominated in tropical-subtropical types, and there were a certain proportion in temperate types. The above information indicated that the flora was a transitional region from the north of south subtropical zone.