浙江磐安种子植物地理成分及与其他区系相似关系的研究

在野外调查和已有资料整理的基础上，分析了浙江磐安种子植物区系的组成和分布区类型。现知磐安共有野生种子植物144科、627属、1 298种(包括种以下分类单位)；属的地理分布型统计表明，磐安种子植物中温带性质成分和热带性质成分比例相当，区系的温带、亚热带特征显著，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。以包括磐安在内的国内22个种子植物区系谱的成分比率为指标，分别应用聚类分析中的组建均连法和排序分析中的主坐标法，生成了反映22个种子植物区系相似性关系的树系图和二维投影图，对区系间的相似性关系进行了研究，结果显示，两种分析方法相结合能较简明、客观地反映植物区系间的异同，可为多区系的关系比较提供参考。

Geographical Elements of Seed Plant in Pan'an,Zhejiang Province and the Similarity Relationship of Different Flora

Based on investigation and statistical analysis, the geographical elements of seed plant in Pan’an County, Zhejiang Province were studied in the present paper. There are 1 298 species of wild seed plants (including varieties) belonging to 627 genera, 144 families in Pan’an County. There are 14 distribution area types and 15 sub-types at genus level, and the flora is related with every part of the world, especially closely related with North America and Japan. The genera of tropical distribution account for 36.20% of overall genera, the genera of temperate distribution account for 51.20% of overall genera, and endemic to China distribution for 1.91%, showing that the region should belong to the East Asia zone and represent to the feature of transition from warm temperate to subtropics area-type. At last, two-dimensional scatter plot of principal coordinates analysis (PCO) and clustering tree of between-groups linkage on the basis of the floristic spectrum (FS) of Pan’an and other twenty-one seed plant flora are drown. The result shows that the combining analysis of the two methods can objectively reflect the similarities of different flora.