横县野生种子植物区系及与附近地区的比较研究

Flora Characteristics of Wild Seed Plants in Hengxian County and Its Comparison with Neighboring Areas

摘要:

为了解广西横县野生种子植物区系特征，对横县野生种子植物进行了调查分析。结果表明，广西横县有野生种子植物1 269种，隶属于163科658属，以被子植物占优势，而裸子植物则贫乏。在科属种组成上，以大科、区域单型属和少型属为主；生活型组成反映亚热带常绿阔叶林群落特征，藤本植物种类丰富。种子植物地理成分均以热带成分为主，兼备亚热带和温带成分。与邻近地区相比较，横县种子植物区系与广东紫金县相似性较高，区系成分组成则与广东新会区、紫金县相近。因此，横县地区野生种子植物种类丰富，热带性质明显，呈热带至亚热带过渡性质，起源古老，具有一定特有现象，与广东地区联系密切。

Abstract:

In order to understand the floristic characters of Hengxian County, Guangxi, the wild seed plants were investigated. The results showed that there were 1 269 species of wild seed plants, belonging to 658 genera and 163 families in Hengxian, angiosperms were dominant, while gymnosperms were scarce. This flora was dominated by large families, oligotypic genera, and regional monotypic genera. The life form of wild seed plants reflects the community characteristics of subtropical evergreen broad-leaved forest, and the lianas are abundant. The geographical composition is dominated by tropical elements, with both subtropical and temperate elements. Compared with its neighboring floras, the flora of Hengxian was more similar to that of Zijin in Guangdong, while the composition of flora was similar to that of Xinhui and Zijin in Guangdong. Therefore, the wild seed plants in Hengxian are rich in species and have obvious tropical characteristics, which are transitional from tropical to subtropical, with ancient origins, endemic species, and are closely related to Guangdong region.