Studies on Edge Effect of Successional Communities and Restoration of Forest Fragmentation in Low Sub-tropics

27 Mar Studies on Edge Effect of Successional Communities and Restoration of Forest Fragmentation in Low Sub-tropics

View Original

Abstract

通过对鼎湖山两个群落及其边缘群落的长期定位研究 ,探讨南亚热带演替群落的边缘效应与森林片断化恢复。 通 过 16a的定位研究 ,从测度群落的物种结构、多样性、生物量与生产力等指标的比较表明 ,马尾松林群落和混交林群落本 身经过 16a的演变 ,虽然有所发展 ,但变化不大 ,群落性质没有改变 ;边缘群落原非常接近马尾松林群落 ,经过 16a的演 变 ,已经发展成为混交林群落 ,说明边缘效应的作用。 边缘群落总体的边缘效应强度 E值为 1. 669,其与各分量的边缘效 应强度值均大于 1,均为正效应。 揭示了边缘效应在森林片断化的恢复过程的作用。在南亚热带优越的气候条件下 ,由于 边缘效应的作用 ,自然植被的边缘扩张 100m约需要 20 a时间。

English Abstract

The dynamics of the ecotone of Pinus fo rest community and mixed forest community was studied
with 16-year s ‘ permanent quadrat analysis and with comparing it to its adjacent communities. Species richness, diversity , or ganization level, leaf area index , biomass and productivity as well as comparative ordination and cluster techniques were used to analyze edge effect. The results showed that ecotonal community had developed into mixed forest, and it was near pine forest in the characteristics in 16 year s ago. Its adjacent communities, pine fo rest and mixed forest had been their base states with some change in 16 years. The edge had moved over 100 m into pine fo rest. Time of edge affection lasted about 20 years in
this type. The direction of edge effect was same as succession, and it speed up succession in ecotonal community mor e. It ‘s a vary good case that edge effect is usefull for patch elimination after fragmentation