Journal
TREES-STRUCTURE AND FUNCTION
Volume 23, Issue 3, Pages 605-610Publisher
SPRINGER
DOI: 10.1007/s00468-008-0305-9
Keywords
Branch junction; Computer tomography (CT); Microfibril angle (MFA); Notch stresses; Wide angle X-ray scattering (WAXS)
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Branch junctions are mechanically particularly interesting areas of trees, because they have to withstand a combination of static and dynamic loads, from the stem as well as from the branch. In the present work, the local adaptation of material properties at branch junctions was assessed by mapping microfibril angle and tissue density. Images of the density distribution were obtained by computer tomography (CT). Wide angle X-ray scattering (WAXS) was used to determine the microfibril angle distribution with high-resolution around the junctions. The stem tissue around the junctions showed increased density and microfibril angle, which points towards an optimisation for fracture toughness. The tissue at the branch bases showed low density combined with high MFA, which provides deformability and flexibility and might act as protection of the stem against load transmission from the branch.
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