Wood colour variation in sapwood and heartwood of young trees of Tectona grandis and its relationship with plantation characteristics, site, and decay resistance

Abstract

To cite this version:Róger Moya, Alexander Berrocal. Wood colour variation in sapwood and heartwood of young trees of Tectona grandis and its relationship with plantation characteristics, site, and decay resistance. Annals of Forest Science, Springer Verlag/EDP Sciences, 2010, 67 (1), <10.1051/forest/2009088>. <hal-00883553>Ann. For. Sci. 67 (2010) • With the purpose of understanding the colour variation, different fast-growth plantations were sampled with different growth rates, tree ages, and sites.• Wood colour was measured with a CIELab system, where three variables are estimated: coordinate L * for lightness, coordinate a * defines redness and coordinate b * defines yellowness.• Results showed only a negative correlation between L * and a * . L * and a * were negatively and positively respectively correlated with pith distance in heartwood, but not for b * . No correlations were found between L * and b * in sapwood and plantation characteristics, while a * was positively correlated with age and height of tree and growth rate. In heartwood, tree age and diameter at breast height were correlated with all colour parameters, but tree height and plantation density were correlated with a * and b * . Cluster site had correlation with L * . Multiple correlation analysis showed that the heartwood is increasing darker (L * ) and redder (a * ) when the trees are older and bigger. Correlation coefficient shown that sapwood and heartwood with lighter colour (L * ) is less resistance to fungal attack, but redness colour (a * ) increasing decay resistance. Mots-clés :CIELab / bois tropicaux / Tectona grandis / aubier / bois de coeur / plantations Résumé -Les variations de couleur dans l'aubier et le duramen de jeunes arbres de Tectona grandis, en relation avec les caractéristiques des plantations, du site et de la durabilité.• Il y a une grande variabilité de la couleur du bois de Tectona grandis produit à partir de plantations à croissance rapide et les causes de ces variations sont relativement inconnues.• Pour comprendre l'origine des variations de couleur nous avons échantillonné dans des plantations à croissance rapide qui diffèrent entre elles en termes de vitesse de croissance, d'âge et de site.• La couleur du bois a été mesurée avec le système CIELab qui permet la mesure de trois variables colorimétriques : la luminance L * allant du noir au blanc, a * et b * allant respectivement du vert au rouge et du bleu au jaune.• Les résultats montrent une corrélation négative entre L * et a * . Dans le bois le coeur il y a une corrélation négative entre L * et la distance à la moelle et une corrélation positive entre a * et la distance à la moelle : aucune corrélation n'apparaît pour b * .

Impact of thermal modification on color and chemical changes of spruce and oak wood

“…Nevertheless, despite that wood colour differs widely among species, the influence of growth conditions, genetics, and the wood anatomy can produce high variation in colour within a single tree (Dianiskova et al 2008, Moya andBerrocal 2010). This variation can also be related to earlywood and latewood, tangential and radial cuts, or heartwood and sapwood (Brischke et al 2007).…”

“…This species is mainly used in the pulp and paper industry and used as energy fuel, whereas there is a limited interest on this wood for the sawn timber production. Usually, fast-growing trees from forest plantations present wood of inferior quality in such attributes as colour, density and mechanical properties, which makes that it fetches a lower price in the timber market (Thulasidas et al 2006, Moya andBerrocal 2010). The surface colour and dimensional instability limit the use of the Eucalyptus grandis wood (Zanuncio et al 2014).…”

Thermo-Vacuum Modification of Teak Wood from Fast-Growth Plantation

“…Teak wood from plantations can be very different from that grown in natural forests, as it is subjected to a great variability reflecting the growing conditions (Moya et al 2014). The fast growing conditions related to the site determine the production of timber with wide rings and a large portion of sapwood, characterized by a clear colour (Richter et al 2003;Moya and Berrocal 2010), and with strongest influence of juvenile wood.…”

Variation of Colour Properties between and within New Robinia Varieties with Enhanced Growing Rates from Different Sites

“…For example, teak (Tectona grandis) is similar to black locust in its formation of a darker hue of the secondary material, which is linked to the drier climate and deeper, more fertile soils on the growing sites (Moya and Calvo-Alvarado 2012). For the same varieties there is good correlation between the individual colour characteristics and age, rate of growth (height and width increase), and planting density (Moya and Berrocal 2010). The deviation of genetic characteristics is often manifested by differences in growth rates.…”

“…The colour difference between heartwood and sapwood is the most prominent in the trunk, but the distance from the centre and the trunk height also affect the colour of the wood (Grekin 2007;Amusant et al 2004). Darker colour (L*) and a stronger red hue (a*) is usually associated with higher long-term biological durability (Moya and Berrocal 2010;Gierlinger et al 2004). However, the opposite could occur as well (Amusant et al 2004).…”