Mechanical stress in the inner bark of 15 tropical tree species and the relationship with anatomical structure

Abstract : Recent studies have shown that the inner bark is implicated in the postural control of inclined tree stems through the interaction between wood radial growth and tangential expansion of a trellis fiber network in bark. Assessing the taxonomic extent of this mechanism requires a screening of the diversity in bark anatomy and mechanical stress. The mechanical state of bark was measured in 15 tropical tree species from various botanical families on vertical mature trees, and related to the anatomical structure of the bark. Significant tensile or compressive longitudinal stresses were observed in the stems of most species. Tensile longitudinal stress was observed in various botanical families and was always associated with fibers arranged in a trellis-like structure and strong dilatation of rays. The highest tensile stress was recorded in species with gelatinous fibers forming a treillis. Compressive stress was typically associated with a large amount of sclereids in the bark, supporting the differentiation of sclereids as a potential origin of the generation of longitudinal compressive stresses in bark. In species exhibiting both a fibrous trellis structure and a significant amount of sclereids, the sign of longitudinal stress may depend on the balance between these two mechanisms.
Complete list of metadatas

Cited literature [35 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-02368075
Contributor : François Gibier <>
Submitted on : Monday, November 18, 2019 - 12:31:04 PM
Last modification on : Friday, November 22, 2019 - 1:37:08 AM

File

Art_Almeras_al_Botany_2019.pdf
Files produced by the author(s)

Identifiers

Citation

Romain Lehnebach, Léopold Doumerc, Bruno Clair, Tancrède Alméras. Mechanical stress in the inner bark of 15 tropical tree species and the relationship with anatomical structure. Botany / Botanique, NRC Research Press, 2019, ⟨10.1139/cjb-2018-0224⟩. ⟨hal-02368075⟩

Share

Metrics

Record views

9

Files downloads

9