Avaliação dos parâmetros dendrométricos para o marmeleiro (Croton sp.).

Abstract

The present work aimed to select the best model to estimate the volume and mass of quince (Croton sp.), as well as to determine its shape factor, stacking factor and basic density. 40 trees were cubed using the Smalian method, at the Experimental Farm Lameirão, located in the municipality of Santa Terezinha - PB, owned by the Federal University of Paraíba. Trees were grouped into four diameter classes of 2-4, 4-6, 6-8, and 11 cm onwards, with a distribution of 10 trees per class. To determine the density, wood discs were removed along the trunk, obeying the following positions: at the base and at 25, 50, 75 and 100% of the trunk height. The choice of the best model to estimate the volume and mass of the quince tree was carried out based on the coefficient of determination, the residual standard error and the graphic analysis of the residues. After adjusting the equations, it was found that the model VolR = 0.001718+4.5455 G130, and the model Weight = 0.526349+3727.6 G1, 30; presented satisfactory statistical results with a uniform residual distribution to a greater practicality in the application of the equation. The form factor and the stacking factor found for the quince tree were 0.66 and 2.54 respectively. The basic density with a moisture content, the wet basis, of 24%.