Status da comunidade arbórea remanescente 33 anos após a colheita florestal na Amazônia brasileira.

Abstract

It was evaluated the changes in the remaining tree community (1981 and 2012) from a tropical forest at the experimental site of forest management at km-67 of the Tapajós National Forest -FNT, in the municipality of Belterra, State of Pará. The data were collected in 36 permanent plots of 0.25 hectare. It were observed all trees with a diameter of 1.30 m - DBH, greater than or equal to 5 cm, with the first measurement happening in 1981, one year after the harvestingand the following in 1982, 1983, 1985, 1987, 1992, 1997, 2007 and 2012; however, it were used for this study only the first and last measurements. After 33 years of the harvesting, the forest exploitationdid not show evidence of causing changes in the richness of forest species. The diametric distribution of the forest community presented a diameter distribution pattern of uneven-aged forests (reverse-J), tending to the balancing. The admission rates are higher than mortality, indicating that a densification is taking place in the population sampled. The mortalitypercentages of the individuals monitored in the first measurement were concentrated in the smaller diameterclasses; this mortality in relation to the ecological groups shows us that this occurred mainly in the group of the secondaryinitial ones. The forest biomass of the area was recovered, however it should be noted that among the 10 commercial harvested species, the volume was not recovered, although the recovered volume is accumulated for the species not harvested in the first harvesting.