海口羊山湿地野生维管束植物资源的调查

Vascular Plant Flora of Wetland in Yangshan of Haikou City

通过实地调查、标本考证与文献查阅,从植物物种组成和地理成分等方面开展羊山湿地植物区系研究。结果表明:(1)羊山湿地维管束植物119科413属687种,具有较高的物种多样性,其中海南特有种5种,占总种数的0.73%;(2)羊山湿地维管束植物中,主要的科为禾本科(Gramineae)、菊科(Compositae)、大戟科(Euphorbiaceae)、桑科(Moraceae)和茜草科(Rubiaceae)等。主要的属为榕属(Ficus)、莎草属(Cyperus)、蓼属(Polygonum)和蒲桃属(Syzygium)等;(3)羊山湿地野生维管植物区系以热带分布为主,热带成分占科总数(不含世界分布科,下同)的90.12%,占属总数的90.5%。温带成分所占比例较小,分别占科属总数的9.88%和8.97%,反映出羊山地区植物区系的热带边缘性质,且热带性有减弱的趋势。

A floristic study of Yangshan Wetland in Haikou,Hainan Province,China was made from the aspects of plant species composition and geographical composition through field investigation,specimen textual research and literature consulting to have a good picture of the plant resources and floristic characteristics of Yangshan Wetland.The results showed thatYangshan wetland has a high species diversity,including 687 species of vascular plants belonging to 119 families,413 genera and 687 species.Of the species5 are endemic species inHainan,accounting for 0.73%of the total tree species.Gramineae,Compositae,Moraceae and Rubiaceae are the main families of vascular plants in Yangshan Wetland.The main genera are Ficus,Cyperus,Polygonum and Syzygium.The main flora of wild vascular plants in Yangshan Wetland is tropical,and its tropical compositions accounted for 90.12%of the total families(exclusive of families worldwide distributed)and 90.5%of the total genera(exclusive of genera worldwide distributed),respectively.The temperate floristic composition is low,accounting for 9.88%and 8.97%of the total families and genera,respectively,reflecting the tropical marginal nature and a weak tropical trend.