Avaliação da densidade e orientação de manejo de povoamentos de Pinus elliottii var. elliottii Engelm. no município de Mariópolis - PR

Abstract

In the development of a forest plantation, trees are influenced by their genetic characteristics and the conditions imposed by the environment, developing until reaching a limit in the relation between the number of trees and their size. Therefore, knowing the maximum number of individuals that a stand supports is essential to achieve maximum productive use, as well as supporting silvicultural interventions aimed at reducing competition and avoiding self-thinning. This work had as main objective to evaluate the density and to guide the management of stands of Pinus elliottii Engelm. In the Southwest of Paraná. In order to collect the data, preference was given to points where there were occurrences of dead individuals. Using the sampling method proposed by Bitterlich, where data were collected from 10 sample points of four stands, with 15, 18, 20 and 25 years old, located in a property in the municipality of Mariópolis - PR. From the individuals included in the sample unit were measured the height, CBH, and the distance from the central tree to the competitors. Subsequently, the punctual density was evaluated by the method proposed by Spurr, using a BAF of 2.3. The roughing weights were defined based on the relative spacing index. Stands with 20 and 25 years of age demonstrated to be in high competition, requiring immediate silvicultural intervention. This does not apply at this time to stands of 15 and 18 years of age, which still have potential to increase until density control is necessary. The level of thinnings for stands of 20 and 25 years were 38.5% and 41% of the number of trees, respectively.