%0 Journal Article
%T How does bark contribution to postural control change during tree ontogeny? A study of six Amazonian tree species
%+ Bois (BOIS)
%+ Universiteit Gent = Ghent University (UGENT)
%+ Ecologie des forêts de Guyane (UMR ECOFOG)
%A Lehnebach, Romain
%A Almeras, Tancrede
%A Clair, Bruno
%< avec comité de lecture
%@ 0022-0957
%J Journal of Experimental Botany
%I Oxford University Press (OUP)
%V 71
%N 9
%P 2641-2649
%8 2020-05-09
%D 2020
%R 10.1093/jxb/eraa070
%K Allometry
%K Bark density
%K Bark residual strain
%K Bark thickness
%K Inner bark
%K Mechanical stress
%K Ontogeny
%K Sclereids
%K Tropical trees
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Biomechanics [physics.med-ph]
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph]
%Z Life Sciences [q-bio]/Vegetal Biology
%Z Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestryJournal articles
%X Recent works revealed that bark is able to produce mechanical stress to control the orientation of young tilted stems. Here we report how the potential performance of this function changes with stem size in six Amazonian species with contrasted bark anatomy. The potential performance of the mechanism depends both on the magnitude of bark stress and the relative thickness of the bark. We measured bark longitudinal residual strain and density, and the allometric relationship between bark thickness and stem radius over a gradient of tree sizes. Constant tensile stress was found in species that rely on bark for the control of stem orientation in young stages. Other species had increasing compres-sive stress, associated with increasing density attributed to the development of sclereids. Compressive stress was also associated with low relative bark thickness. The relative thickness of bark decreased with size in all species, suggesting that a reorientation mechanism based on bark progressively performs less well as the tree grows. However, greater relative thickness was observed in species with more tensile stress, thereby evidencing that this reduction in performance is mitigated in species that rely on bark for reorientation.
%G English
%2 https://hal.science/hal-02989154/document
%2 https://hal.science/hal-02989154/file/2020_Lehnebach-Almeras-Clair_JExpBot.pdf
%L hal-02989154
%U https://hal.science/hal-02989154
%~ CIRAD
%~ AGROPARISTECH
%~ UNIV-AG
%~ CNRS
%~ LMGC
%~ GIP-BE
%~ ECOFOG
%~ GUYANE
%~ AGREENIUM
%~ MIPS
%~ UNIV-MONTPELLIER
%~ INRAE
%~ ANR
%~ UM-2015-2021
%~ TEST3-HALCNRS
%~ TEST4-HALCNRS
%~ DPT_ECODIV
%~ TEST5-HALCNRS
%~ INEE-CNRS