Comportamento temporal e espacial da regeneração de diferentes ambientes após o fogo no Domínio Atlântico

Abstract

The most important factor affects the nature systems and acts to maintain diversity is disturbance. Fire account in diversity patterns and functionality of vegetation communities mainly in regeneration phase, the most important life stage of plant, the seedlings. With the intent to analyse the effect of fire over the natural regeneration of differents ecological environments were allocated 66 plots with 2 m x 2 m (4 m²) in seven burned environments (2F, 3F, 4F, 5F, 6F, 7F e 8F) and one unburned (1NF). Were recorded all seedlings and saplings ≤ 15,7cm with CBH (Circumference at Breast Height). The parameters of density, dominance, abundance, richness and diversity were analysed in the sampling carried out in 2012, 2013 and 2014. Parameters of dynamics for individual numbers and basal area were performed during the intervals 2012-2013 and 2013-2014 and the individuals were distributed in height classes. The fire caused different behavior in environments burned with initially greater density, lower diversity, lower abundance and dominance and different values of dynamic and distribution in height classes. Among the burned environments, the 7F obtained the most different behavior and some environments like 4F and 8F was different because of stress in the area hampering the stablishment of saplings and seedlings after fire. Factors like intensity and frequency of disturbance may explain the different behavior in natural regeneration after fire in structural attributes and the species that settled during two years after fire in the different ecological environments.