浙江磐安蕨类植物地理成分及区系相似性分析方法的研究

Pteridophyta Geographic Elements in Pan′an, Zhejiang Province and the Pteridoflora Similarity Relationships in Different Floras

分析了浙江磐安蕨类植物区系的组成和分布区类型,现知磐安共有蕨类植物34科、60属、112种(包括各种变种和变型)。磐安蕨类植物以东亚分布类型为主,特别是中国-日本分布类型最多,亚热带、暖温带特征显著,该区应置于中国-日本森林植物亚区从暖温带向亚热带过渡的范围内。最后,文章生成了反映22个蕨类植物区系相似性关系的二维投影图和最小生成树图,对区系间的相似性关系进行了研究。结果显示,两种方法相结合能较客观地反映蕨类植物区系间的异同,可为多区系比较提供参考。

Based on investigation and statistical analyses, the pteridophyta geographical elements of Pan′an, Zhejiang Province was studied in the present paper. There are 112 species (include varieties) of pteridophytes belonging to 60 genera, 35 families in Pan′an. At species levels, the East Asia and endemic Chinese element takes the largest proportion (accounting for 83.3%), showing that the region is one part of the center of East-Asian elements(especially China-Japan elements). So the region should belong to the East Asia zone and represents to the feathure of subtropics transition to warm temperated zone. At last, two-dimensional scatter plot of principal coordinates analysis (PCO) and the minimal spanning tree (MST) on the basis of the floristic spectrum (FS) of Pan′an and other twenty-one pteridophytic floras are drawn. The result shows that the methods can objectively reflect the similarities of different floras.