中国亚热带中部藤本植物区系的基本特点

对中国亚热带中部(湖南、湖北)藤本植物区系特点和与邻近地区的关系进行了统计和分析.结果表明:该区共有土著藤本种子植物60科159属784种,其区系具有种类丰富、分布类型多样、特有成分较多、区系较古老等特点,在科、属水平上与贵州的关系最密切,在种的水平上与华东的关系最密切;与该区的全部种子植物区系相比,藤本植物区系的热带性更强,并与喜马拉雅及我国西南有较强的地理渊源等特点.因此认为,复杂的地形和一定的海拔高度有利于藤本植物多样性的形成;许多热带性的科、属中的藤本植物能分布到其分布区的最北缘位置,代替直立的乔灌木生活型在分布的北缘地带生存.

The Essential Characteristics of Vine Flora in the Subtropical Zone of Central China

The essential characteristics of vine flora in the subtropical zone of Central China(Hunan,Hubei) SZCC(HH)] and the relationships between this zone and those of neighbouring regions were analysed and discussed.Our results show that there were 784 species of seed vine belonging to 159 genera in 60 families and the characteristics of the flora of the seed vines were regarded as having rich species,diverse areal-types,rich endemic and archaic elements in SZCC(HH),that there was a consanguineous relationship between the family and genera in SZCC (HH) and that of Guizhou Province and there was also a consanguineous relationship between the species in SZCC(HH) and that of East China,and that compared with the seed flora in SZCC(HH),the seed vine flora had relatively strong tropical characteristics and shared more geographic resources with the Himalayan region and the south-west of China.We conclude that complex terrain and appropriate altitude are propitious to forming diversity of vines.Instead of arbor and frutex life-form,the vines of many tropical families and genera can be distributed to the northernmost site.