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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) : pp. 1643-1655.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : FORESTRY

Abstract : 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

Mots-clés complémentaires : Bagassa guianensis

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

Classification Agris : K50 - Processing of forest products
F50 - Plant structure

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

Auteurs et affiliations

  • Bossu Julie, CNRS (FRA) - auteur correspondant
  • Lehnebach Romain, Université de Montpellier (FRA)
  • Corn Stephane, Université de Montpellier (FRA)
  • Regazzi Arnaud, Université de Montpellier (FRA)
  • Beauchêne Jacques, CIRAD-ES-UMR Ecofog (GUF) ORCID: 0000-0003-4578-3670
  • Clair Bruno, CNRS (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/588501/)

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