西天目山自然保护区森林垂直带的定量分析

Quantitative Analysis of Vertical Forest Zones in The Nature Reserve of Mount West Tianmu

通过对西天日山自然保护区森林植被的调查,取得样地资料50份,抽样面积达10hm^2,抽样成数为1/60。根据各样地乔木层常绿阔叶树种或落叶阔叶树种的比例与所在海拔高度的相关关系,统计分析了西天目山森林植被垂直带的分布界限。常绿阔叶林带现状森林植被的分布上限为660m,演替顶极植被为796m;落叶阔叶林带的分布下限分别为1133m和1176m;其间为常绿-落叶阔叶林带的分布地段。另外,还研究了组成西天目山森林植被的建群种。主要有青冈、甜槠、紫楠,浙江樟,小叶青冈、雷公鹅耳枥、茅栗、小叶白辛树,四照花,川榛,柳杉和黄山松等。绝大多数乔木树种作为伴生树种散生在西天目山各森林群落之中。

On the basis of 50 samples from an area of 10 hectares of the forest vegetation in the Nature Reserve of Mount West Tianmu, this paper analyses the vertical boundaries of the forest distribution according to the relations between the rate of evergreen and deciduous broad-leaved dominant tree species in those samples and the altitude above sea level at which they located. The upper distributive limits of the present and the successive climax vegetations of the evergreen broad-leaved forests are 660 and 796 meters above sea leavel respectively; and the lower limits of the deciduous broad-leaved forests are 1133 and 1176 meters above sea leavel respectively; and the sections between them are evergreen and deciduous broad-leaved mixed forests. The edificators of forest vegetation in this region are Cyclobalanopsis glauca, Cyclobalanopsis gracilis, Castanopsis eyrei, Phoebe skeareri, Cinnamomum chekeangense, Carpinus viminea, Castanea seg-uinii, Pterostyrax corymbosa, Cornus kusa ssp. chinensis, Corylys kweichowensis, Cryptomeria jortunei and Pinus taiwanensis etc. Most of the species scatteringly grow as subordinate species in all kind of forest communities in this region.