海南岛尖峰岭地区种子植物区系组成及地理成分研究

尖峰岭地区位于海南岛西南部 ,面积约 470 km2 ,有种子植物 1 83科、90 6属、2 0 87种及变种。区系组成及地理成分分析结果表明 ,本区种子植物区系有如下特征 :(1 )科属种的组成较为丰富 ,但属内种系较贫乏、分化程度弱 ;(2 )地理成分复杂 ,以热带成分、热带亚洲成分占优势 ,特有成分也相对较丰富 ,是海南岛整体区系的重要组成部分 ;(3)区系有一定邃古性 ,本质上是华夏植物区系不可分割的一部分。

Composition and geographical elements of the spermatophytic flora from Jianfengling area of Hainan Island

WT5”BZ] Jianfengling area is located in the southwestern part of Hainan Island, China (18°23′～18°50′ N, 108°36′～109°05′ E; alt. 20～1 412 m) with a total land area of 470 km 2. Its spermatophytic flora consists of 2 087 species of 906 genera in 183 families, accounting for 54 30%, 28 31% and 7 65%～7 94% of the total numbers of families, genera and species of the spermatophytic flora all over the country. Analysis of the floristic composition and the geographical elements shows that the flora has the following characteristics: (1) The flora is rich in angiosperm and poor in gymnosperm. The former has 181 families, 893 genera and 2 074 species, while the later only 2 families, 8 genera and 13 species. (2) 66 4% of species belongs to the monotypic and oligotypic (2～5 species) genera with a ratio of species/genera of 2 30. (3) The flora has a complex composition dominated by tropical elements, especially the Asian tropical ones, and has a wide connection with the world spermatophytic flora, taking into account its more inter continentally distributed elements and more endemic elements, which indicates that Jianfengling's flora is also one of the most important parts of Hainan Island's flora. (4) Many of the Cathaysian floristic elements can be found in the flora, which approves that this flora is undoubtedly a indiscerptible part of the Cathaysian flora in nature.