广西特有植物区系特征研究

Floristic characteristics of endemic plants to Guangxi

关键词:  特有植物  植物区系  岩溶地区  广西

Key words:  endemic plants  flora  karst area  Guangxi

摘要:

分析论述了广西特有植物区系特征。结果表明：(1)广西特有植物共859种,隶属于119科303属,其中蕨类植物15科22属42种,裸子植物3科4属7种,被子植物101科277属810种。这些特有种中,以草本植物种类最多,有440种,灌木、乔木类型次之。(2)地理成分复杂多样,分布交错混杂。种子植物科包含9个分布类型,属包含14个分布类型。种则依据在广西区内地理分布可划分为5个分布亚型,其中以桂西南分布种类最多。(3)科属种的水平上都表现出明显的的热带-亚热带性质。4.区系成份兼具古老性和年青性,并表现出岩溶地区特有化发展的特征。

Abstract:

The floristic characteristic of endemic plants to Guangxi was discussed in this paper. The results showed:(1)There were totally 859 species of endemic plants to Guangxi belonging to 303 genera and 119 families;among them 15 families,22 genera and 42 species were fern;3 families,4 genera and 7 species were gymnosperm;101 families,277 genera and 810 species were angiosperm. Shrub and arbor were less than herb which contained 440 species. (2)Geographical elements were diverse. There were 9 distribution patterns on the level of family and 14 on the level of genus. According to present geographical distribution of species,the endemism were divided into 5 sub types and the south west of Guangxi distribution pattern included the most species. (3)Flora showed an obvious tropical and subtropical character on all levels of family,genus and species. (4)Floristic elements had an ancient origin,but most of them were recently formed neo endemic plants. The specialization of karst area was conspicuous.