【摘要】 研究了粤西黑石顶相近年龄的杉木(Cunninghamialanceolata)林与次生性常绿阔叶林的物种多样性及群落结构特征,并与中生性常绿阔叶林进行比较.结果表明,杉木人工林在16龄及24龄时物种多样性水平均较低,而次生性常绿阔叶林在演替过程中物种数目迅速增加并超过中生性常绿阔叶林,物种多样性在16龄及26龄时均达到较高水平.杉木林在16龄至24龄期间群落密度变化不大,始终稍低于中生性常绿阔叶林,群落始终以杉木占据优势,生物量与基面积逐渐积累增加.次生林在演替初期,群落密度远高于中生性常绿阔叶林,但随演替的进程而逐渐下降并趋于稳定,在16龄到26龄的10a间优势种的组成发生很大变化,而生物量与基面积增加很少,群落演替发生迟滞.在生物量分配方面,次生林地下生物量所占比例最高,杉木林最低,中生性常绿阔叶林居于两者之间.更多还原

【Abstract】 The species diversity and structure characters of Cunninghamia lanceolata plantations and secondary evergreen broadleaf forests with similar age are analyzed and compared with that of mesophytic evergreen broadleaf forests. The results show that restoration of biodiversity of the plantation is slower compared with the secondary forest.The species diversity of secondary forest increases quickly during the early stage of its succession,but that of Cunninghamia lanceolata plantation with similar age remains low.The community structures of plantations and secondary forests are different.During the period of age from 16 to 24, the change of density of Cunninghamia lanceolata plantation is not obvious,while basal area and tree biomass have an increase density.In the early succession stage of secondary forest,the density is much higher than that of the mesophytic forests.It decreases gradually and tends towards stability as succession continues.The dominant species of the secondary forest change dramatically,the tree biomass and basal area increase little,and the succession is retarded during the period of age from 16 to 26.As to the allocation of biomass,the percentage of belowground biomass of the secondary forests is the highest,whereas that of plantations is higher than that of mesophytic forests.更多还原