Simulation of leaf transpiration and sap flow in virtual plants : Model description and application to a coffee plantation in Costa Rica

Dauzat Jean, Rapidel Bruno, Berger André. 2001. Simulation of leaf transpiration and sap flow in virtual plants : Model description and application to a coffee plantation in Costa Rica. Agricultural and Forest Meteorology, 109 (2) : 143-160.

Autre titre : Simulation de la transpiration foliaire et du flux de sève chez des plantes virtuelles : description du modèle et application à une plantation de caféiers au Costa Rica

Résumé : Computer representations of plants (virtual plants) are used as the basis for a model simulating leaf transpiration and sap flow. The virtual plants provide a detailed description of plant geometry and topology and, once positioned in a scene, enable a highly realistic reconstruction of a portion of the canopy. Stomatal conductance as well as energy balance are simulated by the model at the level of individual leaves in order to calculate their transpiration. Leaf transpiration is then cumulated to get the sap flow throughout the plant. Owing to its structure, the model can take into account feedbacks such as the effect of the temperature of a leaf on its stomatal conductance, transpiration and water potential, and in return, the effect of water potential of a leaf on its stomatal conductance. The model has been validated on a coffee tree stand in Costa Rica. The geometry (i.e. 3-D position, area and diameter of organs) of six adult coffee trees in a row was measured in the field in order to generate a computer scene. Stomatal conductance, sap flow, water potential and wood hydraulic conductivity were measured for model parameterisation and validation. Analysis of model outputs lead to a correction of leaf boundary layer thickness. After calibration, the model exhibited correct values of transpiration and water potential in different microclimatic conditions.

Mots-clés Agrovoc : Coffea arabica, transpiration, sève, modèle de simulation, stomate, bilan énergétique, potentiel hydrique, feuille, port de la plante, conductance stomatique

Mots-clés géographiques Agrovoc : Costa Rica

Classification Agris : U10 - Informatique, mathématiques et statistiques
F60 - Physiologie et biochimie végétale

Auteurs et affiliations

• Dauzat Jean, CIRAD-AMIS-AMAP (FRA)
• Rapidel Bruno, CIRAD-CA-COTON (MLI) ORCID: 0000-0003-0288-5650
• Berger André, CEFE (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/479808/)

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