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Titre :
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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)
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Titre original:
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Une méthode de double digitalisation pour construire des arbres virtuels avec des feuilles non planes : application aux propriétés morphologiques et d'interception de la lumière de jeunes hêtres (Fagus sylvatica)
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Auteurs :
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J. Chambelland ;
INRA UMR PIAF CLERMONT FERRAND ;
M. Dassot ;
B. Adam ;
INRA UMR PIAF CLERMONT FERRAND ;
INRA UMR PIAF CLERMONT FERRAND ;
N. Donès ;
INRA UMR PIAF CLERMONT FERRAND ;
Philippe Balandier ;
CEMAGREF NOGENT SUR VERNISSON EFNO ;
A. Marquier ;
M. Saudreau ;
INRA UMR PIAF CLERMONT FERRAND ;
G. Sonohat ;
INRA UMR PIAF CLERMONT FERRAND ;
H. Sinoquet ;
INRA UMR PIAF CLERMONT FERRAND ;
INRA UMR PIAF CLERMONT FERRAND
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Type de document :
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article/chapitre/communication
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Année de publication :
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2008
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Format :
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p. 1059-1069
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Note générale :
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Diffusion tous publics
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Langues:
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= Français
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Mots-clés:
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FAGUS SYLVATICA
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FEUILLE
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LUMIERE
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MORPHOLOGIE
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SCANNER
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METHODOLOGIE
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RECONSTRUCTION 3D
;
PEUPLEMENT FORESTIER
;
FORET
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REGENERATION DES ARBRES
;
ARCHITECTURE DE L'ARBRE
;
ARBRE FORESTIER
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Résumé :
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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.
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Lien pérenne :
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DOI : doi : 10.1071/FP08051 
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Source :
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Functional plant biology, vol. 35 n° 10
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