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Forestry Advance Access published online on April 28, 2008
Forestry, doi:10.1093/forestry/cpn015
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© Institute of Chartered Foresters, 2008. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The relationship between standing tree acoustic assessment and timber quality in Scots pine and the practical implications for assessing timber quality from naturally regenerated stands

David Auty1,2 3 and Alexis Achim2,*

1 School of GeoSciences, University of Edinburgh, Crew Building, The King's Buildings, West Mains Road, Edinburgh EH9 3JN, Scotland
2 Forest Research, Northern Research Station, Roslin, Midlothian EH25 9SY, Scotland

* Corresponding author. Faculté de Foresterie et Géomatique, Pavillon Gene-H.-Kruger, local 2505, 2425 rue de la Terrasse, Université Laval, Québec, G1V 0A6, Canada


  Abstract

This paper describes studies that were conducted to test the hypotheses that acoustic tools provide reliable non-destructive predictions of mechanical properties of Scots pine (Pinus sylvestris L.) and that these allow comparisons of the timber quality between stands with different silvicultural histories. Acoustic testing was carried out in two plantations (Mount High and Seafield Estate) and one naturally regenerated stand (Glengarry Forest) in North Scotland. One hundred trees were assessed at Mount High and Seafield Estate and 11 trees were felled for cutting into 40 small clear specimens. These were then subjected to static three-point bending tests. Linear regression analysis demonstrated a good correlation between acoustic velocity and modulus of elasticity (MoE) (R2 = 0.53) and between acoustic velocity and modulus of rupture (MoR) (R2 = 0.59). A non-linear model was applied to take into account the effect of age on MoE (R2 = 0.58) and MoR (R2 = 0.54), and the data from all three sites were compared taking into account the biases that could be attributable to differences in age. The predicted mean MoE and MoR values indicated that the mechanical properties of the clear wood from the naturally regenerated trees are at least comparable with those from the plantation-grown trees.

3 Present address: School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen AB24 3UU, Scotland

Received 23 October 2007.
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