Analysing the effects of local environment on the source-sink balance of Cecropia sciadophylla : A methodological approach based on model inversion

Letort Véronique, Heuret Patrick, Zalamea Paul-Camilo, De Reffye Philippe, Nicolini Eric-André. 2012. Analysing the effects of local environment on the source-sink balance of Cecropia sciadophylla : A methodological approach based on model inversion. Annals of Forest Science, 69 (2) : 167-180.

https://doi.org/10.1007/s13595-011-0131-x

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Quartile : Q1, Sujet : FORESTRY

Résumé : Context Functional-structural models (FSM) of tree growth have great potential in forestry, but their development, calibration and validation are hampered by the difficulty of collecting experimental data at organ scale for adult trees. Due to their simple architecture and morphological properties, "model plants" such as Cecropia sciadophylla are of great interest to validate new models and methodologies, since exhaustive descriptions of their plant structure and mass partitioning can be gathered. o Aims Our objective was to develop a model-based approach to analysing the influence of environmental conditions on the dynamics of trophic competition within C. sciadophylla trees. o Methods We defined an integrated environmental factor that includes meteorological medium-frequency variations and a relative index representing the local site conditions for each plant. This index is estimated based on model inversion of the GreenLab FSM using data from 11 trees for model calibration and 7 trees for model evaluation. o Results The resulting model explained the dynamics of biomass allocation to different organs during the plant growth, according to the environmental pressure they experienced.

Mots-clés Agrovoc : Cecropia sciadophylla, arbre, modèle végétal, physiologie de la nutrition, anatomie végétale, compétition biologique, modèle mathématique, facteur du milieu, facteur climatique

Mots-clés géographiques Agrovoc : Guyane française, France

Classification Agris : U10 - Informatique, mathématiques et statistiques
F61 - Physiologie végétale - Nutrition
F62 - Physiologie végétale - Croissance et développement
F40 - Écologie végétale

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

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