Application of a mock-up based transpiration and photosynthesis model on a coffee plantation in Costa Rica

Rapidel Bruno, Dauzat Jean, Berger André. 1999. Application of a mock-up based transpiration and photosynthesis model on a coffee plantation in Costa Rica. In : Multi-strata agroforestry systems with perennial crops = [Systèmes agroforestiers multi-étagés avec cultures pérennes]. Jimenez F. (ed.), Beer J. (ed.). Turrialba : CATIE, 198-203. International Symposium on Multi-Strata Agroforestry Systems with Perennial Crops, Turrialba, Costa Rica, 22 Février 1999/27 Février 1999.

Autre titre : Application d'un modèle de photosynthèse et transpiration basé sur des maquettes à une plantation de caféier au Costa Rica

Résumé : In Costa Rica, #Erythrina poeppigiana# is used as shade tree in most coffee plantations. The balance between benefits and disadvantages of this association for the coffee production probably depends on the local environmental conditions. The use of simulations from computer models could help to find out where the conditions are met to ensure the beneficial effects of the presence of Erythrina in a plantation. Calculating the radiative and energy balance of individual leaves is likely to substantially improve the transpiration estimation, but requires the calculation of net radiation on an individual leaf scale. This was made possible by the development of specific models, MIR and MUSC, simulating radiative transfers on computerized plant mock-ups. The model described in this paper consists of six main modules, for the calculation of leaf radiative balance, one dimensional turbulent transfers above and within the canopy, leaf energy balance, leaf stomatal conductance, sap flow, and gross photosynthesis of each leaf. The model effectively reders the main parameters of hydric functioning in a plant. However, a major modification concerning aerodynamic exchanges between the leaf and the atmosphere had to be made. 3-D modelling of turbulent transfers is a serious theoretical problem and efforts need to be made in this direction. The model, which was tested on a few coffee plants, functions correctly. However, the precise description of the architecture of coffee then becomes necessary

Mots-clés Agrovoc : Coffea arabica, Erythrina poeppigiana, culture intercalaire, ombrage, bilan radiatif, modèle de simulation, photosynthèse, transpiration, stomate, sève, potentiel hydrique, conductance stomatique, modélisation

Mots-clés géographiques Agrovoc : Costa Rica

Classification Agris : U10 - Informatique, mathématiques et statistiques
F60 - Physiologie et biochimie végétale
F61 - Physiologie végétale - Nutrition

Auteurs et affiliations

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

Source : Cirad - Agritrop (https://agritrop.cirad.fr/390436/)

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