ADJUSTMENT OF TAPER MODELS AND ASSORTMENT OF LOGS OF AFRICAN MAHOGANY IN AGROFORESTRY SYSTEMS IN BELTERRA, PARÁ

Abstract

The use of taper models makes it possible to estimate the number of logs and their respective volumes according to the destination of wood. Therefore, the objective of the present study was to adjust taper models and to estimate the number of African mahogany logs (Khaya ivorensis A. Chev.) Generated in agroforestry systems in Belterra, Pará. Data collection for this study was done in two agroforestry systems in the municipality of Belterra, where 35 trees were covered in each one of the sites. Three models of taper were adjusted for both systems, the best model was chosen through adjustment quality statistics and taken for use in estimating the assortment of the multiproducts of the trees. For the assortment, three classes of log dimensions were established according to the use, being: C1 = Tora for energy with a diameter at the thin point greater than or equal to 15 cm and 2 meters in length; C2 = Tora for sawmill with diameter at the thin point greater or equal to 20 cm and 2 meters in length; C3 = Saw blade with a fine-tip diameter of 25 cm or more and 2 meters in length. The Kozak model was the one that presented the best performance for the estimation of the bole taper, with the square root of the mean error (SRME%) lower at both sites. As for the assortment, the systems studied can generate from 47 to 163 wood logs, according to the scenario and the place, being the use for energy purposes that gives the largest volume actually used.KEYWORDS:  Agroforestry, Forest management, Volumetry.