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Development of lumber volume recovery correction models for stem deformations of natural black spruce trees

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Simulation methods exist to predict lumber volume recovery based on tree size. In most cases, however, they do not account for stem deformations, leading to possible overestimations of product recovery. This study calculated differences in lumber volume recovery between a stud sawing simulator and a real stud sawmill for natural black spruce trees. Virtual stems were reconstructed from diameter at breast height (dbh) and tree height data. They were processed with Optitek simulator and results were used to build equations predicting product recovery based on the tree size. Predictions from these equations as well as direct results from the Optitek were used to develop correction models predicting the difference between simulated values and observed values from the real sawmill. Four methods were developed to correct estimated lumber volume recoveries. The results indicated that the lumber volume correction models for stem deformations could adjust the predictions of lumber volume recovery from the simulation to be more accurate estimates, especially for large dbh trees (20 cm dbh class or above). With the correction models developed, it was evident that the lumber volume recovery in natural black spruce trees could be estimated directly and accurately using easily measured tree dbh and height from the forest resource inventory.

Keywords: Black spruce; correction model; lumber volume recovery; sawing simulation; stem deformations

Document Type: Research Article


Affiliations: 1: Forintek Canada Corporation, Québec, Canada 2: Département des sciences du bois et de la forêt, Centre de recherche sur le bois, Université Laval, Québec, Canada

Publication date: January 1, 2007

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