Ajuste e validação de equaçoes de perfil de tronco para especies pinus elliottii var. elliottii na Floresta de Inhamacari

Abstract

This present study was carried out with the objective of determining the best equation of profile of non-segmented trunk for tapering estimates of Pinus elliottii var. elliottii, from the forest of Inhamacari, Manica District, Manica Province. The data for the present work were measured in stands of Pinus elliottii var. elliottii, with sampled trees that grew in stands managed for the production of sawn wood. The cubing of the 45 trees was made by the Hohenald's relative method, taking the relative measures of the diameters 0%, 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95% and 100% of the total height of the shaft, not considering the height of the stump. To define the total height of each shaft, it was considering the minimum diameter of the top of 10 cm. With these data, different trunk profile equations, the best ones having been selected using the value of F, Adjusted Coefficient of Determination (R 2%), Standard deviation of the residuals (S yx%), Index of Furnival (IF%), Graphical Analysis of Residues, Medium Residues and Graphical Analysis of Profiles medium. In the validation process, the Chi-square test (X 2) and graphic analysis were used. THE the equation selected as the best fit, was the Shoepfer equation (1969), with the highest value of the coefficient of determination (R 2% = 84,865), lower standard deviation of residues (S xy% = 11.89845), F value (F = 605.46), and average residual value (RM = 4.0628E-15), but with the t calculated, less than the critical t. (TRADUÇÃO NOSSA)