Dinâmica da regeneração natural de três espécies transplantadas e in situ no entorno de clareiras de exploração seletiva, Moju-PA

Abstract

The behavior dynamic of natural regeneration of forest species is still less knew, being fundamental to better forest environment understanding, assisting on the forest management techniques. Thus, this research had as objectives the evaluation on natural regeneration behavior and from transplanted individuals to clearings surrounding clearing areas, addressing the species: Vouacapoua americana Aubl, Tabebuia serratifolia (D.Don) Nichols and Newtonia suaveolens (Miq) after forest selected exploration. The experiment locates on the experimental Field of Embrapa Amazônia Oriental, on the municipality of Moju-Pa. In this area, one forest selected exploration happened, where 9 clearings were chosen with size between 231 m² and 748 m². In each clearing 04 tracks were installed measuring 10m to 50m, starting on the clearing edge to inside the forest using cardinal directions. Each track was divided in squared plots with 10 m in one side, that were numbered from 1 to 5, from the clearing to the forest. On the 1,3 and 5 plots, and on the center of the clearing, sub-samplers with 2 x 2 m and 5 x 5 m were installed. On the 2 x 2 plots, the natural regenerated individuals were measured founding height 10 cm and DAP < 5 cm, however, on the 5 x 5m plots, the height and base diameter of all transplanted individuals were analyzed. To natural regeneration, the annual average add on height, mortality and admission rates. The variable to the transplanted individuals were the annual average add on base diameter and height, besides the mortality rates. Data were evaluated on the Bioestat 5.0 program, using variable analyzes. It can be stated that natural regeneration species and the transplanted ones were not benefited by the canopy openness. The medium and large clearings, after 9 years, still permit sufficient light energy to the survival of natural regenerated and transplanted individuals.