TAPER AND ASSORTMENT OF WOOD FOR Eucalyptus grandis Hill ex Maiden, IN THE SOUTHEAST REGION OF RIO GRANDE DO SUL

• Autor(a) principal: Müller, Ivanor
• Data de Publicação: 2005
• Outros Autores: Finger, César Augusto Guimarães, Schneider, Paulo Renato
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ciência Florestal (Online)
• Texto Completo: https://periodicos.ufsm.br/cienciaflorestal/article/view/1867
• topic: Stem shape; assortment; volume; Eucalyptus grandis; Forma de tronco; sortimento; volume; Eucalyptus grandis

This  study  had  the  objective of studing the stem shape of  Eucalyptus  grandis Hill  ex  Maiden, based  on  261 trees, with diameters at breast height (DBH) ranging from 8 cm to 74 cm, originated from Aracruz Celulose S. A. forests, located at Depressão Central and Escudo Sul-Riograndense, in Rio Grande do Sul state, to determine the volume and assortment of wood in  two  classes: timber (logs with 25 cm of minimum diameter, with bark, and lengths of 5,6;  4,2 and 2,8 m, prioritizing the higher length assortments formation) and industry (stems or portions of stem with diameters between 8 and 25 cm with bark). The fiftieth degree polynomial, having as dependent  variable the relative diameters (di/d) and independent variable the relative heights (hi/h) was selected to describe the shape, with data stratification in three diameter classes (DBH): diameter until 20 cm; between 20 and 30 cm and larger than 30 cm, with coefficient of determination higher than 0,97 and standard error of the estimation lower than 6,2 %, allowing to estimate the relative and absolute volume of the assortments through integration of form function. The model adjustment for the trees complex covering all the diameters breadth generated a coefficient of determination equal to 0,98 and a standard error of the estimation equal to 6,54%, also allowing to select the model to describe the shape and assortment prediction.