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Annals of Forest Science

, Volume 68, Issue 4, pp 681–688 | Cite as

The decreasing radial wood stiffness pattern of some tropical trees growing in the primary forest is reversed and increases when they are grown in a plantation

  • J. Paul McLeanEmail author
  • Tian Zhang
  • Sandrine Bardet
  • Jacques Beauchêne
  • Anne Thibaut
  • Bruno Clair
  • Bernard Thibaut
Original Paper

Abstract

Background

This study examines the radial trend in wood stiffness of tropical rainforest trees. The objective was to determine if the type of growing environment (exposed plantation or dense primary forest) would have an effect on this radial trend.

Methods

The axial elastic modulus of wood samples, representing a pith to bark cross-section, of six trees from several French Guianese species (two of Eperua falcata, one of Eperua grandiflora, two of Carapa procera and one of Symphonia gloubulifera) was measured using a dynamic “forced vibration” method.

Results

Primary forest trees were observed to have a decrease in wood stiffness from pith to bark, whereas plantation trees, from the same genus or species, displayed a corresponding increase in wood stiffness. Juvenile wood stiffness appears to vary depending on the environment in which the tree had grown.

Conclusion

We suggest that the growth strategy of primary forest trees is to produce wood resistant to self-buckling so that the height of the canopy may be obtained with the maximum of efficiency. In contrast, the growth strategy of the trees growing in an exposed plantation is to produce low-stiffness wood, important to provide flexibility in wind. Further experiments to study the behaviour of more species, with more individuals per species, growing across a range of physical environments, are required.

Keywords

Tropical trees Growth strategy Wood stiffness Juvenile wood 

Notes

Acknowledgements

This research has been performed in the framework of the project “Woodiversity” supported by the French National Research Agency (ANR-05-BDIV-012-04). The authors would like to thank the associate editor Barry Gardiner and the two anonymous reviewers for their extremely helpful comments to improve this manuscript. Also thanks to Professor Philip J. Harris, University of Auckland, for reviewing the language of the final version.

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Copyright information

© INRA and Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • J. Paul McLean
    • 1
    Email author
  • Tian Zhang
    • 2
  • Sandrine Bardet
    • 1
  • Jacques Beauchêne
    • 3
  • Anne Thibaut
    • 3
  • Bruno Clair
    • 1
  • Bernard Thibaut
    • 1
  1. 1.Laboratoire de Mécanique et Génie Civil (LMGC)Université Montpellier 2, CNRSMontpellierFrance
  2. 2.College of EngineeringPeking UniversityBeijingChina
  3. 3.CIRAD, EcoFoGEcoFoG: Ecologie des Forêt de GuyaneKourou CedexFrance

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