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Estimation of Eucalyptus delegatensis wood properties by near infrared spectroscopy

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Abstract:

The use of calibrated near infrared (NIR) spectroscopy for the prediction of a range solid wood properties is described. The methods developed are applicable to large-scale nondestructive forest resource assessment and to tree breeding and silvicultural programs. A series of Eucalyptus delegatensis R.T. Baker (alpine ash) samples were characterized in terms of density, longitudinal modulus of elasticity (EL), microfibril angle (MFA), and modulus of rupture (MOR). NIR spectra were obtained from the radial–longitudinal face of each sample and used to generate calibrations for the measured physical properties. The relationships were good in all cases, with coefficients of determination ranging from 0.77 for MOR through 0.90 for EL to 0.93 for stick density. In view of the rapidly expanding range of applications for this technique, it is concluded that appropriately calibrated NIR spectroscopy could form the basis of a "universal" testing instrument capable of predicting a wide range of product properties from a single type of spectrum obtained from the product or from the raw material.

L'utilisation de la spectroscopie infrarouge proche (IRP) calibrée pour la prédiction d'une gamme de propriétés du bois massif est décrite. Les méthodes développées sont applicables à l'évaluation non destructive des ressources forestières à grande échelle, des programmes d'amélioration génétique des arbres et des programmes sylvicoles. Une série d'échantillons d'Eucalyptus delegatensis R.T. Baker (Eucalyptus des montagnes) ont été caractérisés en termes de densité, de module d'élasticité longitudinal (EL), d'angle des microfibrilles (AMF) et de module de rupture (MOR). Les spectres IRP ont été obtenus de la face longitudinale–radiale de chaque échantillon et utilisés pour générer les calibrations pour la mesure des propriétés physiques. Les relations étaient bonnes dans tous les cas, avec des coefficients de détermination variant de 0,77 pour MOR, à 0,90 pour EL et à 0,93 pour la densité des échantillons. Considérant l'accroissement rapide de la gamme d'applications de cette technique, il est conclu que la spectroscopie IRP adéquatement calibrée pourrait constituer la base d'un instrument d'essai universel capable de prédire une large gamme de propriétés des produits à partir d'un seul type de spectre obtenu à partir du produit ou de la matière première.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2001

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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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