Dinâmica da regeneração natural de Couratari guianensis Aubl. (Tauari) em uma floresta tropical explorada seletivamente, em Moju-PA.

Abstract

Even though Natural Regeneration has been scientifically studied, it still needs refining. As it is a vital component of management plan and of forestry treatment, which allows for susteinable exploitation of the natural resources, studies of its composition and dynamic are of Paramount importance. This study aimed to evaluate the population dynamics of Couratari guianensis Aubl from the Lecythidaceae family - Lecythidaceae consists of about 300 species classified into 25 genera, 14 genera in Brazil, with about 100 species - in humid tropical forest upland selectively exploited in Moju-Pa 12 years after its harvest (June 1998-April 2010), which originated gaps with sizes ranging from 231m2 to 748 m2. Of these, 9m were used in this study. Each clearing had been given its center and from the edge of four tracks are of 10m x 50m were marked north, south, east and west ward. For the assessment of natural regeneration were implanted three installments of 2m x 2m in each band, being the edge distances of 20 and 40m. To study the dynamics we used mathematical models called Natural Regeneration rate (TR%), Ticket ( I%) and mortality (M%). The data was analyzed by the Bioestatic 5.0 program through the analysis of variance of three factors (center, direction, class size of the clearing and study period) which revealed no significant difference in the values of TR% in relation to three factors. The same happened with admission and mortality. Generally speaking, Couratari guianensis Aubl behaves as intermediate species in terms of demand for light.