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Trees

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

  • Julie Bossu
  • Romain Lehnebach
  • Stephane Corn
  • Arnaud Regazzi
  • Jacques Beauchêne
  • Bruno Clair
Original Article

Abstract

Key message

Interlocked grain and basic density increase from pith to bark in Bagassa guianensis and greatly improve trunk torsional stiffness and wood tenacity in the radial plane.

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.

Keywords

Interlocked grain Basic density Wood radial patterns Tree architecture Growth strategy Biomechanics 

Notes

Acknowledgements

The authors thank Eric Nicolini (CIRAD—AMAP) and Onoefé NGwete (CIRAD—ECOFOG) for their help in tree identification and field work and Yves Caraglio (CIRAD—AMAP) to share his knowledge on Bagassa guianensis architecture. This research project was financially supported by the Labex CEBA (ANR-10-LABX-25-01), CNRS-INSIS and European Social Fund awards.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

468_2018_1740_MOESM1_ESM.eps (89 kb)
Sup. Mat. 1 A) Width of the IG half-period (P1/2) depending on their number. The red dashed line represents the median P1/2 value obtained for all IG periods. Tukey’s test showed no significant differences (pv=0.251). B) Maximal IG amplitudes corresponding to the amplitude peaks with absolute distance from the pith. Positive correlation between IG amplitude and absolute distance to the pith (IG amplitudes=2.7082+0.9931*r). The red dotted line represents the linear model (R2=0.54; pv< 2.2e-16) (EPS 88 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.CNRS, UMR EcoFoG, AgroParisTech, Cirad, InraUniversité des Antilles, Université de GuyaneKourouFrance
  2. 2.Laboratoire de Mécanique et Génie Civil (LMGC)Université de MontpellierMontpellierFrance
  3. 3.C2MA, IMT Mines AlesUniversité de MontpellierAles CedexFrance

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