南宫林区马尾树的群落学特征

The phytocoenological features of the Rhoiptelea chiliantha community in Nangong, Taijiang County, Guizhou Province

马尾树(RhoipteleachilianthaDielsetHand. Mazz.)是20世纪30年代在贵州发现的第三纪古老单型科植物,在贵州台江县南宫林区局部形成以马尾树为次优种的群落。在600m2样方中有41科53属69种维管束植物,其中单种的属占75.4%。植物区系以热带分布区的类型为主,占总属数的62.9%,温带分布占13.7%。按Raunkiaer生活型分类系统,高位芽植物占94.2%,地面芽植物占5.8%。群落可分为乔木层、灌木层和草本层和层间植物层;在乔木层中,可分出一个亚层。在群落中大果蜡瓣花(CorylopsismuilifloraHance)的重要值最大,为51.83%,其次为马尾树34.61%。保护马尾树这一物种在该地区具有重要的价值。

Rhoiptelea chiliantha Dieis et Hand.-Mazz. is an ancient tertiary plant be longing to the monotype family Rhoipteleaceae, discovered in years of 1930′ in Guizhou Province, where there are some communities, in which R. chiliantha i s a subdominant species. According to the investigations in 6 plots of total 600 m \+\{2\} in the woody area of Nangong, Taijiang County, Guizhou, the communities consist of 69 species, 53 genera, 41 families of vascular plant. Of the 53 gener a, 75.4% are monotype. Analysis of floristic geographical elements showed that t he percentage of tropical elements is high, making up 62.7% of the total numbers of genera, temperate elements 13.7%. According to Raunkiaer′s classification s ystem of life form the spectrum of life form in the community shows that phanero p hytes make up 94.2% of total species, hemicryptophytes 5.8%. The community can b e structurally divided into arborous layer, shrub layer and herbaceous layer, th e arborous layer can be subdivided up 1 sublayer too. In the community the impor tance value of Corylopsis multiflora Hance with 51.83% is the biggest and R . chiliantha with 34.61% in the second one. Therefore protecting R. chiliant ha in the region is of import ant significance.