A double-digitising method for building 3D virtual trees with non-planar leaves: application to the morphology and light-capture properties of young beech trees (Fagus sylvatica)

Functional Plant Biology : FPB
Jean-Christophe ChambellandHervé Sinoquet

Abstract

We developed a double-digitising method combining a hand-held electromagnetic digitizer and a non-contact 3D laser scanner. The former was used to record the positions of all leaves in a tree and the orientation angles of their lamina. The latter served to obtain the morphology of the leaves sampled in the tree. As the scanner outputs a cloud of points, software was developed to reconstruct non-planar (NP) leaves composed of triangles, and to compute numerical shape parameters: midrib curvature, torsion and transversal curvature of the lamina. The combination of both methods allowed construction of 3D virtual trees with NP leaves. The method was applied to young beech trees (Fagus sylvatica L.) from different sunlight environments (from 1 to 100% incident light) in a forest in central France. Leaf morphology responded to light availability, with a more bent shape in well-lit leaves. Light interception at the leaf scale by NP leaves decreased from 4 to 10% for shaded and sunlit leaves compared with planar leaves. At the tree scale, light interception by trees made of NP leaves decreased by 1 to 3% for 100% to 1% light, respectively.

References

Jul 1, 1996·Tree Physiology·D Y Hollinger
Apr 14, 2004·The Plant Journal : for Cell and Molecular Biology·Eli KaminumaTetsuro Toyoda
Apr 12, 2005·The New Phytologist·Steven K RiceNicholas Krouglicof
May 5, 2005·The New Phytologist·Christophe Godin, Herve Sinoquet
Dec 17, 2005·Tree Physiology·Gabriela SonohatFrançoise Lescourret
Jun 27, 2006·Journal of Experimental Botany·Angélique ChristopheClaude Varlet-Grancher
Jul 31, 2007·Plant, Cell & Environment·Ulo Niinemets

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