Avaliação da regeneração natural de Tetragastris altíssima (Aubl.) swart em clareiras abertas em florestas exploradas seletivamente.

Abstract

This study was conducted in a forest with selectively exploration, in the Experimental Field of EMBRAPA Eastern Amazon, MOJU - PA. The objective was to study the behavior of natural regeneration and transplanted seedlings of Tetragastris altissima (Aubl.) Swart. Nine gaps were selected, which were grouped into classes of size, which were implanted a plot of 2 m x 2 m e another of 5 m x 5 m in the centre and four other parcels for each position: Edge, 20 m to 40 m of clearing within the forest and for each direction: North, South, East and West were implanted three tranches. The seedlings were assessed by survival and growth of T. altissima (Aubl.) Swart, during nine years of observation. To survive in the center of clearings, the plantation showed the best results (33,89%) compared to natural regeneration (11,11%). For the distances and directions, the survival of natural regeneration was better to the south at 40 m away from the center of gaps with 11,11% and the West presented to 20 m 7,41%. For planting the species showed 16,67% of survival in the eastern edge and 40m to the south, the best results for this analysis. The growth of the species in the centre was more significant in the planting (7,3 cm/year) than in natural regeneration (0,28 cm/year). In the distances and directions of growth was higher at 40 East to me in the West edge, 0,28 cm/year in natural regeneration, and the highest for the seedlings were transplanted in the eastern edge, where growth was 3,14 cm/ano. The species was established in better environment disturbed than in natural regeneration; both for survival, and for growth, trending to the first would be a viable silvicultural method for enrichment of forests. It is consistent plant species in the environments of radiation directly because of better results at the centre of gaps for the two analyses. The survival and growth of the species in relation to gradients north-south, east-west, was indifferent to this analysis, both for natural regeneration, as for the planting, demonstrating the character of species with ecological characteristics of the group of tolerant of shade.