Uso do método BDq em uma área de caatinga submetida ao manejo florestal

Abstract

The BDq method is based on the concepto of balanced forest and its application leads the forest population to a remaining stock. The work aimed to analyze the technical feasibility in the application of three cutting intensities and six scenarios in Caatinga vegetation submitted to sustainable Forest Management. The work was carried out at Fazendas Baixa da Oiticica, Rancho da Velha and Tabuleiro de Dentro, located in the municipality of Upanema-RN. With an area of 343.0472 hectares of management area, 11 sample units of 20 m x 20 m were installed, where a forest inventory was carried out in an area of 4,400 m2. All individuals with CAP ≥ 6 cm were measured. The individuals were identified in loco, using the APG IV classification system to organize the list of scientific names and species families. For the application of the BDq method, three management alternatives have been proposed, with 40% (Scenario 1), 50% (Scenario 2) and 60% (Scenario 3) of reduction of the basal area and real volume. 1,680 individuals were distributed in 10 families, 18 species and 16 genera. In C1, with a 40% reduction in the basal area, there is an estimated harvest of 831 shafts, being more representative in the center of 2.45 cm diameter class. In C2 at 50%, it allowed a permanence of 70.42% of the stems and a harvest estimate of 29.58% of the individuals, and in C3 with a reduction of 60%, it allowed a permanence of 82.68% of the stems and a harvest estimate 17.32%. In C1, with a 40% reduction in the actual volume, there is an estimated harvest of 1,040 stem. In C2 at 50%, it allowed 62.38% of the stems to remain and a harvest estimate of 37.62% of the individuals, and in C3 with a 60% reduction, 76.79% of the stems and a harvest estimate 23.21%. Taking into account dynamics, ecological succession, commercial exploitation and balanced forest, the combination that showed the most effective results was Scenario 3, with a 60% reduction in the basal area and the actual volume, due to the high number of individuals able to activities forestry and guaranteeing the sustainability of natural regeneration.