江苏蕨类植物区系

对江苏蕨类植物区系组成和地理成分进行了分析,并与相邻地区的浙江、安徽和山东等地进行了比较。江苏共有蕨类植物35科67属140种(含变种和亚种);世界分布类型有18科、19属、5种;热带分布类型有16科、34属、16种;温带分布类型有1科、14属、102种;中国特有分布17种。江苏蕨类植物区系组成比较简单,本区不是近代种系分化中心;地理成分具有明显的从热带向温带的过渡性。通过与邻接地区的比较发现,江苏蕨类植物区系与安徽有较大的亲缘关系,它南承浙江,北接山东,同样具有明显的过渡性,在中国蕨类植物分区中,华东-华中地区含江苏、安徽、浙江,而不含山东的分区方案较合理;水热条件是决定一个地区蕨类植物区系种类丰富程度的重要因素,复杂的地形变化是引起一个地区种系分化的原因之一。

Study on the Pteridoflora of Jiangsu Province, East China

The floristic composition and element of pteridoflora of Jiangsu Province in China were analyzed,and the affinities with its neighbor regions,such as Zhejiang Province,Anhui Province and Shandong Province,were discussed as well.The pteridoflora of Jiangsu consists of 35 families,67 genera and 140 species (including varieties and subspecies).It contains 18 families,19 genera and 5 species belonging to the cosmopolitan areal type;16 families,34 genera and 16 species belonging to the tropical areal types;1 family,14 genera and 102 species belonging to the temperate areal types;and 17 species endemic to China.The floristic composition of pteridoflora of Jiangsu is relatively poor,and this area may not be a differentiation center in modern times.The characteristics of the floristic elements indicate that this is a transitional pteridoflora from the tropics to the temperates.A comparison with its neighbor regions reveals that the pteridoflora of Jiangsu is close to that of Anhui and is a link with its southern neighbor,Zhejiang and its northern neighbor,Shandong,so that the system of regionalization of Chinese pteridoflora which includes Zhejiang,Anhui and Jiangsu in the central and east China region,but not Shandong seems reasonable.It also reveals that climatic conditions play an important role for distribution and flourishing of pteridophyte population and complex land topography gives rise to differentiation of pteridophytes.