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

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.
Complete list of metadatas

Cited literature [51 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01850456
Contributor : Arnaud Regazzi <>
Submitted on : Friday, July 27, 2018 - 1:38:40 PM
Last modification on : Friday, August 2, 2019 - 11:00:02 AM

File

Bossu_et_al-2018-Trees.pdf
Files produced by the author(s)

Identifiers

Citation

Julie Bossu, Romain Lehnebach, Stéphane Corn, Arnaud Regazzi, Jacques Beauchene, et al.. Interlocked grain and density patterns in Bagassa guianensis: changes with ontogeny and mechanical consequences for trees. Trees - Structure and Function, Springer Verlag, In press, ⟨10.1007/s00468-018-1740-x⟩. ⟨hal-01850456⟩

Share

Metrics

Record views

200

Files downloads

77