贵阳喀斯特地区蕨类植物区系初探

摘要

The geographical components of pteridophyte florae in Guiyang Karst region were classified rnbased on field survey and data analysis to know the characters of pteridophyte florae in Guiyang Karst rnregion. The results showed that there were 301 pteridophyte species belonging to 90 genera and 39 families rnin Guiyang Karst region,the dominant families are Dryopteridaceae, Polypodiaceae, Athyriaceae,rnThelypteridaceae and Aspleniaceae, and the dominant genera are Asplenium, Polystichum, Dryopteris rnand Selaginella. The pantropical type with tropical properties was the dominant in the areal types of rnfamilies and genera. While the temperate type was the dominant in the areal types of species. The results rnshowed that floristic geographical composition of the pteridophyte in the Karst region of Guiyang was rnmainly temperate elements and was a part of East Asia flora. They were closely related to Chongqing and rnrelated to Xishan Mountain and the Hongshuihe river to a certain extent.%为了解贵阳地区蕨类植物区系特点,在野外调查和整理资料的基础上,对贵阳喀斯特地区蕨类植物区系的地理成分进行了划分.结果表明:贵阳喀斯特地区共有蕨类植物39科90属301种,优势科为鳞毛蕨科、水龙骨科、蹄盖蕨科、金星蕨科、铁角蕨科,优势属为铁角蕨属、耳蕨属、鳞毛蕨属、卷柏属.在科、属的水平上,具热带性质,以泛热带分布为主,而种的地理分布则以温带分布的类型占优势,表明贵阳喀斯特地区蕨类植物具有温带性质,属东亚区系.贵阳地区蕨类植物与重庆的关系密切,而与昆明西山、贵州红水河的有一定联系.