Proportion and quality of heartwood in Togolese teak (Tectona grandis L.f.)

Kokutsè, Adzo Dzifa; Baillères, Henri; Stokes, Alexia; Kokou, Kouami

doi:10.1016/j.foreco.2003.07.041

Cited by 81 publications

(90 citation statements)

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“…Its timber qualities include a golden brown colour with typical features and grain, resistance to fungus and termites. Teak wood possesses very interesting technological properties such as medium specific gravity, high strength (Bhat and Priya, 2004;Kokutse et al, 2004), good dimensional stability and high durability (Baillères and Durand, 2000). The main wood quality factors related to dimensional characteristics are shrinkages (tangential and radial) and sorption properties such as fibre saturation point (FSP).…”

Section: Introductionmentioning

confidence: 99%

Rapid prediction of shrinkage and fibre saturation point on teak (Tectona grandis) wood based on near-infrared spectroscopy

2010

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To cite this version:Adzo-Dzifa Kokutse, Loïc Brancheriau, Gilles Chaix. Rapid prediction of shrinkage and fibre saturation point on teak (Tectona grandis) wood based on near-infrared spectroscopy. Annals of Forest Science, Springer Verlag/EDP Sciences, 2010, 67 (4), <10.1051/forest/2009123>. Ann. For. Sci. 67 (2010) Abstract• Dimensional stability, along with the natural durability and colour of the wood, is one of the most important characteristics of teak used as timber. However, it is very time-consuming to take measurements of this kind. For the purposes of selection for the production of improved varieties, the number of samples to be measured rapidly exceeds the capacity of a traditional laboratory.• Near-infrared spectroscopy, based on a set of reference data, is a tool enabling many of the chemical properties of wood to be predicted and the number of laboratory measurements to be reduced exponentially. The issue here is a question of checking the effectiveness of NIRS tool to build models and predict the shrinkage and fibre saturation point of teak wood from Togo.• The results show the possible use of NIRS to measure the dimensional stability of teak wood and that it is appropriate to choose the type of wood and type of surface to be measured by NIRS. The best prediction models for radial and tangential shrinkage and fibre saturation point give R 2 values of 0.72, 0.83 and 0.87 respectively with ratios of performance deviation of 1.8, 2.4 and 2.8.• Consequently, after verification on other sets of teak samples, which may or may not be included in the prediction model, NIRS can be used to predict shrinkage and fibre saturation point values accurately for a large number of samples, making it possible to include these characteristics in the selection criteria for classifying wood and high throughput phenotyping. Mots-clés :retrait / point de saturation des fibres / teck / SPIR Résumé -Prédiction rapide du retrait et du point de saturation des fibres pour le bois de teck (Tectona grandis) par spectroscopie proche infrarouge.• La stabilité dimensionnelle avec la durabilité naturelle et la couleur du bois, est l'une des plus importantes caractéristiques pour le teck utilisé en bois d'oeuvre. Néanmoins, les mesures de ce caractère sont longues et coûteuses en temps. Pour les besoins de la sélection pour la production de variétés améliorées, le nombre d'échantillons à mesurer devient vite supérieur aux capacités d'un laboratoire traditionnel.

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Section: Introductionmentioning

confidence: 99%

Rapid prediction of shrinkage and fibre saturation point on teak (Tectona grandis) wood based on near-infrared spectroscopy

2010

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“…Although D w has been found to increase with age in other tropical species e.g. Togolese teak, [22], this is not always the case, e.g. in teak from Kerala, radial variation in specific gravity was fairly uniform [5] and in some species e.g.…”

Section: Discussionmentioning

confidence: 93%

“…The dynamic E L in flexion was calculated using mechanical principles that state a relationship between the natural vibration frequencies and the elastic properties of a material [22].…”

Section: Longitudinal Modulus Of Elasticity E Lmentioning

confidence: 99%

Croissance en diamètre et caractérisation de la limite entre bois juvénile et bois adulte chez l’okoumé des plantations au Gabon

et al. 2007

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Stokes. Radial growth and characterization of juvenile and adult wood in plantation grown okoumé (Aucoumea klaineana Pierre) from Gabon. Annals of Forest Science, Springer Verlag/EDP Sciences, 2007, 64 (8), pp.815-824. Ann. For. Sci. 64 (2007) [815][816][817][818][819][820][821][822][823][824] Abstract -The fast-growing hardwood, okoumé (Aucoumea klaineana Pierre), is a major forest species in Gabon and is used principally for making plywood, but research into the growth and quality of this wood is scanty. Trees from natural forests are favoured for production, yet little information exists on wood characteristics from plantation trees. Therefore, we carried out a dendrochronological study along with measurements of wood longitudinal modulus of elasticity (E L ), density (D w ), dimensional stability parameters (longitudinal, radial and tangential shrinkage and fibre saturation point) and fibre cell morphology to determine if these properties were related to age in trees from two plantations. We then used segmented regression analysis to define the limit (breakpoint) between juvenile (JW) and adult wood (AW). Using monthly precipitation data, we were able to determine that one growth ring is formed per year, composed of a large light coloured ring formed during the long rainy season and a thick, dark band formed during the major dry season. However, thinner bands, analogous to false rings, may also form during the short dry and short rainy seasons. Ring width decreases from the pith to the bark, and the breakpoint between JW and AW was at 19 years old when trees from both plantations were pooled together. No differences in D w or radial and tangential shrinkage occurred with cambial age. E L increased significantly up to the cambial age of 12-14 years, after which the increase with age was only slight and no breakpoint between JW and AW was found. With regard to mean longitudinal shrinkage, AW was found to form after the age of 13 years but fibre cell length was significantly longer after the age of 14.5 and 20 years, depending on the plantation of origin. Therefore, the boundary between JW and AW in plantation grown okoumé occurs between the ages of 13 and 20 years, depending on the characteristic examined. dendrochronology / modulus of elasticity / wood density / shrinkage / fibre saturation point Résumé -Croissance en diamètre et caractérisation de la limite entre bois juvénile et bois adulte chez l'okoumé des plantations au Gabon. L'okoumé (Aucoumea klaineana Pierre) est une essence à croissance rapide que l'on rencontre majoritairement au Gabon. Son bois est principalement utilisé dans la fabrication de panneaux de contreplaqué. Cependant les recherches sur la croissance et la qualité de son bois ne sont pas suffisamment avancées. L'utilisation des arbres issus des forêts naturelles est favorisée pour la production par rapport à ceux issus des plantations dont les caractéristiques sont peu connues. De ce fait, nous avons entrepris d'étudier la dendrochronologie des okoumés dans les deux pla...

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“…Determination of E may prove to be difficult as the strength of wood varies with tree age (Kokutse et al 2004) and height (Tong et al 2009). Friesen et al (2008) used a calibration method to experimentally determine the value of E for each tree that was instrumented.…”

Section: Methodological Solution To Determine Sensor Placementmentioning

confidence: 99%

Instrumental method for reducing error in compression-derived measurements of rainfall interception for individual trees

Stan

Jarvis²,

Levia

et al. 2011

Hydrological Sciences Journal

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Proportion and quality of heartwood in Togolese teak (Tectona grandis L.f.)

Cited by 81 publications

References 10 publications

Rapid prediction of shrinkage and fibre saturation point on teak (Tectona grandis) wood based on near-infrared spectroscopy

Rapid prediction of shrinkage and fibre saturation point on teak (Tectona grandis) wood based on near-infrared spectroscopy

Croissance en diamètre et caractérisation de la limite entre bois juvénile et bois adulte chez l’okoumé des plantations au Gabon

Instrumental method for reducing error in compression-derived measurements of rainfall interception for individual trees

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