Interlocked grain and density patterns in Bagassa guianensis: Changes with ontogeny and mechanical consequences for trees

Bossu Julie, Lehnebach Romain, Corn Stephane, Regazzi Arnaud, Beauchêne Jacques, Clair Bruno. 2018. Interlocked grain and density patterns in Bagassa guianensis: Changes with ontogeny and mechanical consequences for trees. Trees, 32 (6) : 1643-1655.

https://doi.org/10.1007/s00468-018-1740-x

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

	Version Online first - Anglais Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. Bossu et al. 2018 Trees.pdf Télécharger (2MB) \| Demander une copie
	Version publiée - Anglais Accès réservé aux personnels Cirad Utilisation soumise à autorisation de l'auteur ou du Cirad. Bossu2018_Article_InterlockedGrainAndDensityPatt.pdf Télécharger (2MB) \| Demander une copie

Quartile : Q2, Sujet : FORESTRY

Résumé : Trees modulate their building material, wood, throughout their lifetime to meet changing mechanical needs. Basic density, a widely studied wood property, has been proved to be negatively correlated to growth rate and is then considered to reflect the diversity of species growth strategies. An alternative way for trees to modulate growth strategy at constant construction cost is changing the organisation of their fibre network. Interlocked grain, the result of a periodic change in the orientation of the fibres in the tangential plane, is found in numerous tropical tree species. In this study, we first describe the variations in basic density and interlocked grain occurring during ontogeny of Bagassa guianensis, a fast-growing Amazonian species, and analyse their influence on the local mechanical properties of wood at the tissue level. The observed radial patterns and properties are then incorporated in a finite element model to investigate their effect on mechanical properties of the trunk. We report extreme and highly reproducible concomitant radial variations in basic density and interlocked grain in all the sampled trees, with grain angle variations ranging from − 31° to 23°. Such changes in wood during ontogeny allows trees to tailor their growth rate while greatly improving resistance to torsion and reducing the risk of splitting.

Mots-clés Agrovoc : bois, propriété mécanique, Fil et veinure du bois, densité, accroissement du diamètre

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés complémentaires : Bagassa guianensis

Mots-clés libres : Interlocked grain, Basic density, Wood radial patterns, Tree architecture, Growth strategy, Biomechanics

Classification Agris : K50 - Technologie des produits forestiers
F50 - Anatomie et morphologie des plantes

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

Auteurs et affiliations