Análise dos parâmetros fitossociológicos em fragmento de floresta estacional subtropical

Abstract

Characterization of vegetation in forest fragments subsidizes information for regional development, as well as the understanding of ecosystem structure and dynamics. Thus, the aim was to characterize the floristic structure and evaluate the dynamics of a fragment of Subtropical Seasonal Forest for the regional fauna. Parallel strips were used within which temporary plots of 10 m x 10 m were distributed, equidistant 20 m, and all individuals with PAC (circumference measured at 1,30 m from the soil surface) ≥ 15 cm were inventoried. 29 species belonging to 16 families were observed in the middle layer, the lower layer 11 species in 8 families and the upper layer 15 species of 11 families. The fragment showed more than 70% fruit dispersion per zoocoria, indicating its importance for the conservation of regional fauna. Ocotea puberula, Lithraea molleoides, Casearia sylvestris, Allophylus edulis, Cupania vernalis, Luehea divaricata, Actinostemon concolor, Piper aduncun and Aiouea saligna were the most important species, showing high values of importance. Form of dispersion of fruits and seeds of each species is fundamental for the maintenance of biodiversity and natural regeneration, directly influencing the colonization of species and the mode of distribution. The most representative species presented a grouped pattern of spatial distribution, possibly due to their preference for specific environmental conditions. Study made it possible to highlight the ecological importance of the species in different sinusias and the dispersion of the fruits by the fauna, contributing to the natural regeneration and conservation of biodiversity in fragments of Subtropical Seasonal Forest.