珙桐原生林生物多样性变化研究

Research on Biodiversity Change of Primeval Dovetree Forest

以贵州纳雍县国有林场不同年龄光叶珙桐(Davidia involucrate Baill.var.vilmoriniana)原生林替代其演替过程,对其生物多样性变化进行研究。结果表明,乔木层物种多样性指数随林龄的增大呈升高趋势;灌木层物种多样性指数在演替前期逐渐升高,到30年生达到高峰,而后逐渐下降。珙桐林前期演替为落叶阔叶混交林,再演替为常绿与落叶阔叶混交林。原生珙桐林演替进程中物种数量的变化是伴随着阳性先锋树种的衰退和中性顶级植物的发展,在演替前期迅速增加,30年生达到高峰,随后逐步降低。

Abdtract Based on the original forest of dovetree for different ages by the Guizhou Nayong County state-owned Nayong forest farm substitutes and its succession advancement, the biodiversity change tendency of primary dovetree forest were researched .The results finally indicated that, primary dovetree forest succession species in the process of change was accompanied by the decay of positive pioneer species and the development of organic top plants. Species number increased rapidly in the early stage of the succession,and reached peak after 30 years,then gradually reduced. The dovetree forest succession,first of all,for deciduous broad-leaved mixed forest,and succession were evergreen and deciduous broad-leaved mixed forest.The tree layer species diversity index and evenness index rising trend along with the increase of forest age. Shrub layer, species diversity index increased at the early stage of the succession reached peak after 30 years, and then gradually decline.