Caracterização da estrutura horizontal da vegetação de floresta de terra firme: estudo da parcela n.03 do módulo PPBIO Tefé, Amazonas.

Abstract

The Amazonian forest is considered the largest natural reservoir of the planet's plant diversity, but increase in knowledge is difficulted by the extension in area and the interactions between the biotic and abiotic environmental factors, making the studies on phytosociology essential for the understanding of the differents plant communities. Thus, the objective of this study was to understand the structural parameters of density and basal area of a permanent plot and to verify if these parameters suggest a homogeneous structure in the natural terra firme vegetation, in the National Forest of Tefé, in the area of the PPBio module. The area is located in the municipality of Alvarães, AM, Brazil. The specimens were sampled at plot n.03, which has an area that varied according to three samples approaches. In the first approach, plants with DBH ≥ 1cm were sampled. In the approach 2, plants with DBH ≥ 10cm were sampled, and in the approach 3, plants with DBH ≥ 20cm were sampled. A total of 649 specimens were obtained. In the approach 1, 2 and 3 were found densities of 4.866, 565 and 185 ind/ha, respectively. Estimates of basal areas at approaches 1, 2 and 3 were 34.73, 22.79 and 18.42 m2/ha, respectively. The results of three approaches showed variations when compared to the other plots of the PPBio Tefé module and the others areas published in the literature, which showed a heterogeneous vegetation structure with a healthy diametric distribution.