Determinación de una función de ahusamiento para cálculo de volumen en plantaciones de Gmelina arborea, de la empresa ARBORIENTE S.A. cantón Loreto, provincia de Orellana.

Abstract

This research aimed to determine a taper function for the calculation of volume in Gmelina arborea plantations, belonging to the company ARBORIENTE S.A., in Loreto town, Orellana province. Various variables were used to estimate the diameter at different heights of the stem, the commercial and total volume. 36 trees were cut and measured. The method of overlapping logs was used to obtain total and partial volumes more accurately for the cubing. The databases created in Excel were used to fit 3 compatible models of taper and volume with and without cortex, respectively. Rstudio and JMP programs were used to determine which of these would be optimal for adjusting the taper functions. For the adjustment of the functions, 1935 pairs of data of diameter with and without bark, section length, total height were used. The functions were fitted by means of simultaneous estimation from the complete information of ordinary least squares (OLS), in linear and non-linear regression. The goodness-of-fit tests consisted of comparing the statistics were Root Mean Squared Error (RMSE), Coefficient of Determination (R squared), Bias Mean Error (E), Akaike Information Criterion (AIC). The results obtained from the regression were analyzed. Rstudio was determined to evaluate the behavior of each taper function developed to predict stem diameters, commercial and total volume. The results showed that the models that best predict the diameter profile and volume were the Cielito 1 and Cielito 2 models with and without bark, respectively, with an R-squared value of 0.99999. It was recommended to carry out this study in different areas of Ecuador and carry out complementary studies with the use of the data obtained.