子午岭地区植被恢复演替过程与环境因子的分类与排序

在野外实地调查基础上,采用双向指示种分析法(TWINSPAN)和除趋势对应分析(DCA)对子午岭地区植物群落进行了数量分类和排序。结果显示:(1)TWINSPAN将50个样方划分为14个群系;DCA排序结果与TWINSPAN分类结果相互印证。(2)第一排序轴上显示出植被由草地、灌丛到森林的恢复演替系列,在此演替过程中土壤中的速效磷逐渐减少,全氮和有机质逐渐增加;第二排序轴反映环境因子的梯度不明显,但植被的演替过程会受到海拔、坡度的影响。研究表明,随着植被恢复演替的进展群落结构在变化,乔木层的重要值增加,所在群落中的全氮、速效磷、有机质等亦呈现规律性变化。

The Successional Recovery Process of Plant Communities in Ziwuling Are and Classification and Ordination of Environmental Factors

Based on the survey of community plots,a quantitative analysis of the communities in Ziwuling area is performed with TWINSPAN(Two way indicator species analysis) and DCA(Detrended correspondence analysis) methods.The result showed that(1)50 quadrates surveyed from Ziwuling area were classified into 14 types by TWINSPAN,which was comfirmed with the ordination results of DCA eatch other.(2)The first axes indicated a successional series from grassland,bush to forest.The available phosphate decreased and the total nitrogen and the organic matter increased gradually in this process.The second axes indicated the grads of environmental factors is not significant,but successional process of plant communities can be affected by altitude and tslope.Studies indicated that the community structure changed with vegetation succession and the important value of tree layers increased and local communities are accompanied by the disciplinary changes of total nitrogen,available phosphate,organic matter and so on.