田阳敢壮山种子植物区系科的分析

敢壮山位于广西田阳县境内,面积133.3hm2,有野生种子植物254种,隶属于207属、75科,其中世界分布科16个,占总科数的21.3%,热带分布科50个,占66.7%,温带分布科9个,占12.0%,且区域单种科、单属科丰富。生活型以木本为主。区系优势科为蝶形花科、禾本科、菊科、大戟科、桑科等,而表征科是葡萄科、防己科、漆树科、桑科、荨麻科等,它们大多为热带分布科,表明该区系具有热带性质。该区系起源具有古老性,但区系的特有程度较低。

Flora Analysis of the Seed Plants in Ganzhuang Mountain of Tianyang County

Ganzhuang mountain lies in Tianyang county,Guangxi,with an area of 133.3 hm2.There are 254 species of wild seed plants,which belong to 207 genera and 75 families.Among them,16 families are cosmopolitan(21.3%),50 ones tropical(66.7%),9 ones temperate(12.0%).Furthermore,those of one-species family and one-genera family are abundant.The life forms of the plants are mainly woody.The dominant families are Papilionaceae,Gramineae,Compositae,Euphorbiaceae,Moraceae and so on,and the characteristic families are Vitaceae,Menispermaceae,Anacardiaceae,Moraceae,Vriticaeae.They are mainly tropical distribution,which shows that the flora is tropical in nature.In terms of origin,the flora is of long history,but in uniqueness,it is low in degree.