Canadian Forest Service Publications
Quantifying the Effects of Wood Moisture and Temperature Variation on Time-of-Flight Acoustic Velocity Measures. 2018. Newton, P.F. Forests 9:527.
Issued by: Great Lakes Forestry Centre
Catalog ID: 39645
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Plain Language Summary
The relationship between the dynamic modulus of elasticity of xylem tissue and acoustic velocity has been established for a number of commercially-important coniferous species. However, results from previous investigations suggest the relationship may be effected by xylem temperature and moisture variation. Consequently, this study investigated the significance of these effects on acoustic velocity measurements within standing red pine and jack pine trees through (1) temporal and repeated sampling of the same set of red pine and jack pine sample trees throughout spring-to-autumn seasonal period, and (2) given (1), statistical inference of the derived species-specific statistically-validated hierarchical linear mixed-effects regression models. The results indicated that acoustic velocity was influenced by temperature for both species whereas the influence of moisture was only observed for red pine. Resultantly, species-specific correction equations for adjusting observed acoustic velocity measurements to corresponding equivalents referenced to standardized temperature and moisture conditions were developed. Overall, the results of this study has demonstrated the effects of environmental variability on the precision of internal wood attribute forecasts and provided quantitative solutions for accounting for these effects when deploying the acoustic approach in forest operations and silvicultural research. Thus incrementally contributing to the non-destructive methodologies deployed for predicting internal fibre attributes via acoustic velocity measures in additional to provide computational solutions for accounting for environmental variability when acoustic sampling in the Canadian boreal forest.