FLORÍSTICA E ESTRUTURA DE DUAS COMUNIDADES ARBÓREAS SECUNDÁRIAS COM DIFERENTES GRAUS DE DISTÚRBIO EM PROCESSO DE RECUPERAÇÃO

This work aimed to characterize the floristic composition and structure of the tree community of areas in the process of environmental recovery in the municipality of Bocaiuva do Sul, PR. The production and dissemination of data and information about floristic and phytosociology of forest cover in two areas with distinct environmental conditions and interventions, is a relevant contribution to understanding the dynamics in tree structure in areas of environmental recovery. For this, two areas with different degrees of degradation were selected: Initial Secondary Forest (FSI), area in which there was a clear cut, removal of the superficial layers of the soil and revegetation with Mimosa scabrella. Benth; and Advanced Secondary Forest (FSA), which represents a fragment of Mixed Ombrophilous Forest where there was selective exploitation of species of commercial interest. Vegetation sampling was carried out in 10 plots of 150 m(2) in each area (0.15 ha), where all trees including dead trees with a diameter at breast height (DBH) equal or greater than 15 cm. In the FSI, 40 species belonging to 24 families were sampled, while in the FSA, 57 species belonging to 27 botanical families were sampled. The results showed that the vegetation structure in FSA is different from FSI, with lower tree density, higher basal area and floristic diversity.