海南竹类的地理分布及区系特征

通过对海南岛竹类区系地理成分进行统计、分析和对其分布、与邻近地区竹类区系关系的探讨,其区系特征归纳如下:1.拥有丰富的特有成分。2.区系的热带性质明显。3.分布上差异显著。4.区系原始、古老。5.与毗邻的广东竹类区系联系较多。

THE GEOGRAPHICAL DISTRIBUTION AND FLORISTIC CHARACTERISTICS OF BAMBUSOIDEAE IN HAINAN

Based on the statistical analyses of the geographical elements of genera and species, and studies on distribution and relations between Hainan and its neighbouring regions, this paper concludes the flora features as follows: 1. This flora of Bambusoideae is rich in Hainan species endemic. The amount (percentage) of Hainan species endemic is 27 (71.05%), more than every area on the mainland of China. 2. The geographical elements are obviously characterized by tropical nature. 3. The distributions of species (or species endemic) on different parts of Hainan is clearly different. On the all parts of Hainan, the southern Hainan is richest in species (or species endemic), the species on the northern Hainan is poorest, the amount of species on the eastern Hainan is more than on the western Hainan. 4. The origin of the Bambusoideae flora of Hainan is ancient and the flora is rich in primitive taxa. All the genera are divided into 8 primitive genera (with 8 stamens) and 6 advanced genera (with 6 stamens). 5. There are more relations with neighbouring Guang Dong flora of Bambusoideae than with any other area on the mainland of China.