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Colour and decay resistance and its relationships in Eperua grandiflora

Étude de la variabilité de la couleur, de la durabilité naturelle et recherche de corrélations chez Eperua grandiflora

Abstract

  • Eperua grandiflora, which is widely distributed in the French Guiana forest region, shows high variability in decay resistance. Further information concerning this wood quality parameter is necessary, but standard testing methods are complex and time-consuming. We assessed the use of colorimetry to determine durability in heartwood samples from a range of trees.

  • Eperua grandiflora colour parameters were measured using a CIELAB system, revealing that the tree effect was greater than the radial position and height effects.

  • • The wood samples were exposed to Coriolus versicolor and Antrodia sp. according to two European standards (En 350-1 and XP CEN TS 15083-1). Eperua grandiflora is more susceptible to brown rot. These two standards did not give the same durability classes. The high variation in natural durability was due to the tree effect.

  • • These two properties were found to be correlated and the assessment also distinguished the extreme durability classes but they are not sufficient to classify the class of durability of this species.

Résumé

  • Eperua grandiflora, essence largement répandue dans les forêts de Guyane soufre d’un défaut majeur: une grande variabilité de sa durabilité naturelle à l’égard des champignons lignivores. Dans un premier temps, nous avons étudié la variabilité de la mesure de la couleur selon le système CIElab afin de vérifier si la colorimétrie peut être utilisée comme un indicateur de la durabilité naturelle.

  • • Nous avons étudié la résistance de cette essence à l’échelle inter, et intra-arbres à l’égard de Coriolus versicolor et Antrodia sp., conformément aux normes européennes en vigueur : EN 350-1 et XP TS 15083-1. Les résultats ont révélé qu’ Eperua grandiflora est plus sensible au champignon de pourriture brune.

  • • De même, l’utilisation des normes a montré que l’on n’obtenait pas les mêmes classes de durabilité. La variabilité de la durabilité et de la couleur est plus importante à l’échelle inter-arbres qu’à l’échelle intra-arbre.

  • • Enfin, ces deux propriétés sont corrélées mais nous ne pouvons envisager d’utiliser la colorimétrie comme indicateur de la durabilité naturelle, car elle ne permet de différencier que les classes extrêmes.

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Correspondence to Nadine Amusant.

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Amusant, N., Fournier, M. & Beauchene, J. Colour and decay resistance and its relationships in Eperua grandiflora . Ann. For. Sci. 65, 806 (2008). https://doi.org/10.1051/forest:2008061

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Keywords

  • natural durability
  • colour
  • decay resistance
  • variability
  • heartwood
  • tropical wood

Mots-clés

  • durabilité naturelle
  • couleur
  • résistance à la pourriture
  • duramen
  • bois tropicaux