Parametric identification of a functional-structural tree growth model and application to beech trees (Fagus sylvatica)

Letort Véronique, Cournède Paul-Henry, Mathieu Amélie, De Reffye Philippe, Constant Thiéry. 2008. Parametric identification of a functional-structural tree growth model and application to beech trees (Fagus sylvatica). Functional Plant Biology, 35 : 951-963. International Workshop on Functional-Structural Plant Models. 5, Napier, Nouvelle-Zélande, 4 Novembre 2007/9 Novembre 2007.

Résumé : Functional-structural models provide detailed representations of tree growth and their application to forestry seems full of prospects. However, owing to the complexity of tree architecture, parametric identification of such models remains a critical issue. We present the GreenLab approach for modelling tree growth. It simulates tree growth plasticity in response to changes of their internal level of trophic competition, especially topological development and cambial growth. The model includes a simplified representation of tree architecture, based on a species-specific description of branching patterns. We study whether those simplifications allow enough flexibility to reproduce with the same set of parameters the growth of two observed understorey beech trees (Fagus sylvatica L.) of different ages in different environmental conditions. The parametric identification of the model is global, i.e. all parameters are estimated simultaneously, potentially providing a better description of interactions between sub-processes. As a result, the source-sink dynamics throughout tree development is retrieved. Simulated and measured trees were compared for their trunk profiles (fresh masses and dimensions of every growth units, ring diameters at different heights) and compartment masses of their order 2 branches. Possible improvements of this method by including topological criteria are discussed.

Mots-clés Agrovoc : Fagus sylvatica, modèle de simulation, modèle mathématique, croissance, anatomie végétale

Mots-clés géographiques Agrovoc : Lorraine, France

Mots-clés complémentaires : Architecture des arbres

Classification Agris : U10 - Informatique, mathématiques et statistiques
F62 - Physiologie végétale - Croissance et développement
F50 - Anatomie et morphologie des plantes
K10 - Production forestière

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Letort Véronique
• Cournède Paul-Henry, Ecole centrale Paris (FRA)
• Mathieu Amélie
• De Reffye Philippe, CIRAD-BIOS-UMR AMAP (FRA)
• Constant Thiéry, ENGREF (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/547571/)

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