Year-end Sale % OFF 
Abstract
The aim of this study was to develop stem taper equations for trees of Pinus taeda L. inside and outside bark with extensive applicability to several age classes. Data were obtained from 631 trees of P. taeda, ranging from 4 to 31 years of age, in different stands distributed in several counties of the Midwest region of the state of Santa Catarina, Brazil. The taper models of Biging (1984), Schöpfer (1966), and Kozak et al. (1969) were tested. These models were fitted in their simplest formulation as well as by varying their coefficient linear functions of stand age with the procedure PROC NLIN in the software SAS® University Edition. There were no significant differences in accuracy and precision in the estimates between the simplest formulation of the Schöpfer (1966) model and the variation of its coefficient b linear function of age, and thus, the simplest formulation was chosen. Among all taper models tested, the Schöpfer (1966) model presented greater accuracy and precision to estimate diameters inside and outside bark, throughout the stem of Pinus taeda, in the Midwest region of the state of Santa Catarina, Brazil.
Highlights
The volume of timber obtained from a tree depends, on its future application, i.e., when it is intended to produce lumber, the usable volume of timber is different to the volume when it is intended to be used as firewood (BATISTA et al, 2014)
The present study was undertaken in stands of P. taeda belonging to the company Juliana Florestal Ltd., which is associated with FRAME Madeiras Especiais Ltd. and is based in Caçador, state of Santa Catarina, Brazil
The values of Ra2j and syx% for the stem taper equations (Equations 8 and 9) selected in the present study are very similar to those found by Kohler et al (2013) for the Schöpfer (1966) model adjusted for P. taeda that were 10 to 23 years of age from the state of Santa Catarina
Summary
The volume of timber obtained from a tree depends, on its future application, i.e., when it is intended to produce lumber, the usable volume of timber is different to the volume when it is intended to be used as firewood (BATISTA et al, 2014). When timber assortment volumes of a forest stand are available, it is possible to plan the optimized sale of the timber, aiming for a greater valuation in the consumer market, and maximizing profits. Taper models, which can estimate timber volumes for any assortment, enable production planning, transport logistics, and marketing to be undertaken based on the timber assortment, with the number of logs destined to each specific product measured (COSTA et al, 2016), as well as being an important tool in information management for forestry companies (EISFELD et al, 2008). Calculation of the shape is possible by measuring stem diameters at different heights and its expression is given by processes involving form quotients, form factors, and taper functions
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