广西海南风吹楠群落区系组成、结构与特征

Floristic composition,structure and phytogeographic characteristics of Horsfieldia hainanensis communityin Guangxi

通过野外样地调查,对广西5个海南风吹楠群落特征进行比较分析,结果表明:在6 100 m2样地中,维管束植物共261种,隶属于94科196属,其中热带分布的科、属均占绝对优势,海南风吹楠群落具有从热带向亚热带过渡的性质。海南风吹楠群落以草本植物种类最多,所占比例为38.3%,草本植物覆盖度和物种丰富度与林分郁闭度和灌木植物覆盖度存在显著负相关性。群落的层间植物种类丰富,占16.7%。乔木层以常绿树种占优势,优势科主要有大戟科、肉豆蔻科、梧桐科、云实科、桑科等典型的热带、亚热带科。

The investigation of the Horsfieldia hainanensis community in Guangxi showed that there were 261 species of vascular plants,belonging to 196 genera and 94 families in 5 plots with an area of 6 100 m2.Families or genera of tropical distribution species were dominant. H. hainanensis community showed the nature of transition from tropical to subtropical zone. The herbs were rich in the community and accounted for 38. 3% of the total species. Herb coverage and species richness were significantly and negatively correlated with canopy density and shrub coverage. Liana species of H. hainanensis community were abundant,accounting for 16. 7% of the total species. Tree layer was dominated by evergreen broadleaved tree species. Euphorbiaceae,Myristicaceae,Sterculiaceae,Caesalpiniaceae,Moraceae and other typical tropical and subtropical families dominated in H. hainanensis community.