Dynamics and growth of the arboreous stratus in the Atlantic Forest areas, in the Vale do Rio Doce, MG, region / Dinâmica e crescimento do estrato arbóreo em áreas de Mata Atlântica, na região do Vale do Rio Doce, MG

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The objective of the present work was to study the dynamics of the floristic composition and of the horizontal and vertical structures, the basal area and the volumetric growth and the annual periodic increment of three reserve areas of the Atlantic Forest pertaining to the CENIBRA S.A., locatted in the municipalities of Caratinga, Coronel Fabriciano and Guanhães, in the State of Minas Gerais, Brazil. In the Projeto Lagoa do Piau (Lagoa do Piau Project), located in the municipality of Caratinga, two reserve areas of the Atlantic Forest were studied, named Forest 1 and Forest 2. In the first fragment 16 plots were monitored, and in the second one, six plots. In the São José Project, located in Coronel Fabriciano, 12 plots were monitored; and in the Cachoeira das Pombas Project, located in the municipality of Guanhães, 20 plots with equal dimensions (10 x 50 m) were monitored during five years. In all of the areas studied few changes in the floristic composition and in the importance and cover values during the monitoring period were observed. A decrease in the Shannon-Weaver (H) diversity index was observed in the Forest 1 of the Lagoa do Piau Project; in the São José and in the Cachoeira das Pombas Projects, only Forest 2 showed an increase of H, and this difference was only significant in the Cachoeira das Pombas Project, by the t test. The species were classified by ecologic group anf for each one of the areas studied analyses of the following parameters were made: absolute density, absolute dominance, volumetric structure, basal area and volumetric growth and annual periodic increment (IPA), for the two monitoring periods, IFC1-2002 and IFC2-2007, by species and ecologic group. For the parameters of total absolute density, total absolute dominance and total volume, all the areas studied showed a positive change rate, that is, a tendency of populational growth. These parameters were also analysed for species and ecologic group levels. In relation to the basal area and the volume growths, all the areas showed total gross and net growths, including and excluding the positive ingrowth. These parameters were also analysed for species and ecologic group levels. The initial secondary species group was the one presenting the greatest annual periodic increment in three of the four areas studied: Lagoa do Piau Project in Forest 1 and 2, and in the Cachoeira das Pombas Project. In the São José Project, the ecologic group with the greatest IPA was that of the species without classification. Only Forest 1 showed a statistical difference for the volumetric distribution in terms of number of individuals. In the other areas, the diametric distribution did not differ from one another.

ASSUNTO(S)

manejo florestal atlantic forest forestry growth estrutura fitossocilógica mata atlântica forest structure crescimento florestal dynamics

ACESSO AO ARTIGO

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