Efeito de borda na estrutura e na dinâmica espaço-temporal de um fragmento de Mata Atlântica no Nordeste do Brasil

Abstract

The edge effects alter structure and vegetation dynamics in forest fragments, from the hypothesis was quantified the influence of edge in the canopy and understory of a fragment of Atlantic Forest in Igarassu, PE. We used two transects of 10 × 100 m, perpendicular to the edge and a 20 × 50 m within the fragment divided into plots of 10 × 10 m was collected soil samples from 0 to 20 cm depth for chemical and physical analysis. The sample was divided into edge (0-50m), an intermediate (50-100m) and interior (280 m from the tree line), measured and tagged all individuals living with stem diameter at breast height (DBH)> 4 , 77 cm. In one corner of the plots of 10 × 10 m plots were plotted for 5 × 5 m for analysis of understory woody, plants with stem diameter at ground level > 0.96 cm and <4.77 cm. The canopy had a higher number of individuals and greater wealth at the edge, while in the understory woody, number of individuals, basal area and richness were higher in the interior. The more dynamic, both in the canopy and the understory was inside due to the entry of individuals and the further growth of remaining. A canonical correspondence analysis showed that the soil did not affect the distribution of species. The results indicate that the edge of the fragment is sealed, since most of the assumptions raised were confirmed.