Prédiction du défilement et de la branchaison de l'épinette noire

Authors: Lejeune, Geneviève
Advisor: Ruel, Jean-Claude
Abstract: Stem taper (variation of stem profile) and branchiness (variation of branch basal diameter) equations are useful in evaluating the value of lumber recovery through sawing optimization. In this study, taper and branchiness equations were calibrated for black spruce (Picea mariana (Mill.) BSP) using data derived from past biomass and crown morphology studies. Equation parameters were estimated by a linear mixed effect method employing a first-order continuous autoregressive error process. The resultant stem taper equation captured variation across a wide range of stand and environmental conditions. Similarly, using tree diameter at breast height (Dbh) and crown length as explanatory variables, the resultant branchiness equations enabled the prediction of the (1) largest branch diameter per tree, and (2) mean branch diameter per tree. Tree height measurements are not always available in common forest inventory data, but are essential to taper and branchiness prediction. Consequently, an additional equation to predict tree height was also developed, based on Dbh and site index.
Document Type: Mémoire de maîtrise
Issue Date: 2004
Open Access Date: 11 April 2018
Permalink: http://hdl.handle.net/20.500.11794/17942
Grantor: Université Laval
Collection:Thèses et mémoires

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