Forest Investment Account

Abstract of FIA Project Y051290

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Modelling the impact of stand management activities on the wood characteristics of lodgepole pine

Author(s): Goudie, James W.
Imprint: Victoria, B.C. : BC Ministry of Forests, 2005
Subject: Forest Investment Account (FIA), Pinus Contorta, British Columbia, Wood, Quality
Series: Forest Investment Account (FIA) - Forest Science Program

Abstract

Lodgepole pine (Pinus contorta Doug. ex Loud. Var. latifolia Engelm.) is a valuable commodity in British Columbia. There is concern that post-harvest pine, which is regenerated at much lower densities than fire-origin stands, will have lower wood quality because of excessively deep crowns. We destructively sampled 60 lodgepole pines ranging in age from 20 to 124 years from two sites in southern interior BC and two sites in central BC. Our first objective was to develop a statistical model to predict average inside bark diameter of lodgepole pine branches along the bole. These predictions link with equations predicting lumber distributions previously published by Forintek (Middleton et al. 1995). We also fit an equation to predict maximum knot size used to grade logs for estimate value. Our second objective was to predict the transition point of juvenile to mature wood in relation to crown position. To achieve this, we merged data from the 60 pine collected in the central and southern Interior with lodgepole pine data collected in 1986 and 1994 by Forintek Canada Corp. and BC Ministry of Forests, Research Branch. The number of years of mature wood was expressed as a function of tree age, relative height to crown base, and crown ratio. Our results support the argument that long crowns, associated with wide spacings, will lead to less mature wood than close spacings that encourage crown lift. Our equations predicting average and maximum knot size and juvenile-mature wood transition were incorporated into a system of computer models, SYLVER, that includes a tree model (TASS), log bucking and grading routines (BUCK and GRADE), a sawmill simulator (SAWSIM), and a financial analysis system (FAN$Y). The results of this project immediately assist forest managers to evaluate the economic efficacy of stand- and forest-level decisions.


For further information, please contact J. Goudie, BC Ministry of Forests - Research Branch (jim.goudie@gems.gov.bc.ca)

Updated September 08, 2005 

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