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Prediction of Pinus sylvestris clear-wood properties using NIR spectroscopy and biorthogonal partial least squares regression

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Abstract:

Thirteen wood parameters were predicted using near infrared (NIR) spectra in the range 780–2380nm modelled by biorthogonal partial least squares regression. The analysis of parameters and NIR measurements was done on clear-wood samples from the base and midstem of Scots pine (Pinus sylvestris L.) from trees at two sites. Calibrations based on the measured parameters at seven growth rings (cambial age ranging between 6 and 42years) could be divided into three groups: (i) the best accuracy was found for longitudinal modulus of elasticity (r> 0.9) followed by bending, compression, and cell length (0.8< r < 0.9); (ii) microfibril angle, longitudinal hardness, proportion of latewood, and creep with correlations in the range of 0.7–0.8; and (iii) tangential hardness, cell diameter, and cell wall thickness with 0.4< r < 0.7. It was also shown that juvenile (cambial age≤20years) and mature wood can be classified using NIR techniques.

La régression bi-orthogonale partielle par les moindres carrés a été utilisée pour modéliser 13 paramètres du bois à l’aide de spectres de transmittance dans les longueurs d’onde allant de 780 à 2380 nm dans le proche infrarouge (PIR). L’analyse des paramètres et des mesures de transmittance dans le PIR a été réalisée sur des échantillons de bois sain provenant de la base du tronc et de la portion intermédiaire de la cime de tiges de pin sylvestre (Pinus sylvestris L.) récoltées dans deux stations. Les étalonnages basés sur la mesure des paramètres dans sept cernes annuels (âge cambial variant de 6 à 42 ans) pouvaient être divisés en trois groupes: (i) la plus grande précision a été obtenue pour le module d’élasticité longitudinal (r > 0,9) suivi par la flexion, la compression et la longueur des cellules (0,8 < r < 0,9), (ii) l’angle des microfibrilles, la dureté longitudinale, la proportion de bois final et le fluage de retour avaient un coefficient de corrélation de 0,7–0,8 et (iii) la dureté tangentielle, le diamètre des cellules et l’épaisseur des parois cellulaires avaient un coefficient de corrélation variant entre 0,4 et 0,7. Nous avons aussi montré que l’utilisation de la transmittance dans le PIR permet de distinguer le bois juvénile (âge cambial ≤20 ans) du bois mature.

Document Type: Research Article

Publication date: July 1, 2008

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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