Phytosociology and diametric distribution in cerrado sensu stricto area, Dueré-TO

Abstract

The aim of this study was to make a phytosociological survey and evaluate the diameter structure of a fragment of cerrado woodland, Dueré-TO. It was allocated systematically 20 permanent plots of 10 x 10 m each, spaced 5m apart, making a total sampling area of 2000 m². In the plots were sampled every shrub and individual trees living and dead standing with the circumference breast height CBH (measured at 1.30 m above the ground) ? 15 cm. The basic data obtained from 20 plots were analyzed for the purpose of obtaining a matrix that lists the number of trees per hectare of the ith species in the j-th diameter class. It was sampled 248 individuals, of whom 230 live and 18 dead standing, distributed in 41 species, represented in 24 families. The average vegetation height was estimated at 5.82 m, since the average diameter was 12,1cm and a basal area of 9.24 m² ha ^-1. The Shannon diversity index (H ') was found to be 3.31 and Pielou evenness (J') 0.86. It was observed the presence of two Diametric distribution patterns present in the cerrado sensu stricto fragment parsed, one in "J" reversed and the other with a Diametric discontinuous distribution. The Diametric distribution of plant community presented J-inverted format. The distribution of heights focused on intermediate classes.