Colour Variation In Teak (<i>Tectona grandis</i>) Wood From Plantations Across The Ecological Zones Of Ghana

Abstract

The colour of teak wood from plantations in Ghana was characterized by the International Commission on Illumination (CIE) L* a* b* colour measurement system in order to study the variations of wood colour parameters (lightness-darkness, redness-greenness and yellowness-blueness), among the different ecological zones. Teak trees totaling 46 were felled from 8 different plantation stands in four different ecological zones of Ghana (moist semi-deciduous forest, MSDF; dry semi-deciduous forest, DSDF; transition savanna forest; and savanna forest). Colour measurements were made on strips obtained from logs cut from the felled trees. Chemical analyses were performed on soil samples obtained from the rooting zones of the teak trees. Both environmental and tree age effects on colour were observed. However, environmental factors had a stronger effect on the colour of teak heartwood than the stand age. Although there were no significant differences between teak wood colour in moist semi-deciduous forest and transition savanna forest on one hand, and dry semi-deciduous forest and savanna forest on the other hand, in general, environment seemed to be an important factor, with teak wood colour being relatively darker in wetter areas than drier ones. Wood colour parameters showed differing relationships with soil chemical properties ranging from no relation through weak to moderate relations. For instance, soil pH decreased moderately with decreasing L* values (increasing darkness), indicating some evidence that teak wood colour may be predicted from soil pH. However, there was very little evidence that teak wood colour could be predicted from soil exchangeable cations (Ca 2+ , Mg 2+ , Na + and K +). The range of observed site quality was rather limited. Nevertheless, richer plantation sites showed a tendency toward darker and less red heartwood.

Effect of growth rate on wood quality of teak (Tectona grandis L. f.): a comparative study of teak grown under differing site quality conditions

“…In the present study the Munsell notations for fast grown samples were comparable with slow grown samples with regard to hue (redness to yellowness), value (lightness) and chroma (saturation). Similarly, and Thulasidas et al (2006) did not find any significant difference in hue and value for wet and dry teak, while the results were contradictory to the findings of Tadashi et al (2003) and Derkyi et al (2009) where they reported darker wood in wet area compared to teak from drier areas. The variability in luminance (i.e.…”

Variação da Cor da Madeira de Teca em Função da Densidade e do Teor de Extrativos

“…A teca (Tectona grandis L. f., Família Verbenaceae) é uma das mais valiosas e mais importantes espécies tropicais no mercado internacional devido à excelente qualidade de sua madeira e ao ciclo de rotação relativamente curto situado entre 20 e 25 anos (Premrasmi & Dietrichs, 1967;Schmincke, 2000;Moya & Pérez, 2007;Derkyi et al, 2009;Miranda et al, 2011).…”

“…A cor natural da madeira pode ser influenciada por fatores genéticos e ambientais como espécie; composição química (principalmente teor e natureza dos extrativos); estrutura anatômica (anéis de crescimento, vasos, raios e tipo de parênquima axial); posição de amostragem na árvore (nos sentidos radial e axial); condições edáficas e climáticas; altura, diâmetro e idade da árvore; tratos silviculturais; e taxa de crescimento da árvore (McGinnes & Phelps, 1983;Desch & Dinwoodie, 1993;Gonçalez, 1993;Mady, 2000;Kokutse et al, 2006;Derkyi et al, 2009).…”

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

“…Sin embargo, existen otros factores a los cuales se puede atribuir la heterogeneidad en el color de las maderas: la especie, la parte usada (duramen o albura), el plano de corte, el contenido de humedad (Mottonen et al 2002, Valverde y Moya 2010, así como el manejo silvicultural y las condiciones edáficas y climáticas de las plantaciones forestales (Derkyi et al 2009). …”