海南滨海砂地种子植物区系的初步研究

海南滨海砂地植物区系共有野生状态的种子植物714种(含变种、亚种)、383属、103科。该区系热带性质明显,热带分布属占总属数(除去世界属和外来属)的93.04%,热带分布种超过总种数(除去广布种和外来种)的80%。热带分布属中又以泛热带分布、古热带分布、热带亚洲至热带大洋洲分布为主体,分别占总属数的46.52%,16.46%和12.03%;热带分布种中则以热带亚洲分布、热带亚洲至热带大洋洲分布、泛热带分布为主体,分别占总种数的35.52%,15.88%和13.42%。该区系特有成分极贫乏,只有32个海南特有种,仅占总种数的5.24%。文章还探讨了该区系与周边地区、各大洲热带地区植物区系的联系。

Study on the Spermatophyte Flora of the Coastal Sandy Region of Hainan Island

The spermatophyte flora consists of 714 species in 383 genera and 103 families in coastal sandy region of Hainan Island.The sandy coastal flora is explicitly of tropics in nature and as a part of tropical Asian flora,the flora also shows conspicuous characters of marginal tropics.The statistics of distributional patterns of taxa shows that genera and species of tropical distribution take up 93.04% and more than 80% of the sum total of the flora respectively.Further,the genera of pantropics,old world tropics,tropical Asia to tropical Australasia take up 46.52%,16.46% and 12.03% of total genera respectively.The species of tropical Asia distribution account for 35.52%,the ones of tropical Asia to tropical Australasia 15.88%,the ones of pantropics 13.42% etc.The species endemic to Hainan in the sandy coastal region are very poor,accout for 5.24% of the total species in the area.The relationships between the sandy coastal flora with ones of vicinity are analysed.