Plot-scale modelling of coffee agroforestry systems in Central America

Van Oijen Marcel, Dauzat Jean, Harmand Jean-Michel, Lawson Gerry, Vaast Philippe. 2009. Plot-scale modelling of coffee agroforestry systems in Central America. In : Modelling agroforestry systems : Workshop Proceedings,Turrialba, Costa Rica, 25-29 February 2008. Rapidel Bruno (ed.), Roupsard Olivier (ed.), Navarro Muriel (ed.). CATIE. Turrialba : CATIE, 191-202. (Technical Meetings, 14) ISBN 978-9977-57-479-4 Workshop on Modelling Agroforestry Systems, Turrialba, Costa Rica, 25 Février 2008/29 Février 2008.

Titre espagnol : Modelaje de sistemas agroforestales a escala de parcela en América Central

Résumé : The productivity and environmental impact of coffee agroforestry systems depend on many factors: environment, management coffee cultivar, tree species. We present a simple dynamic model of coffee agroforestry systems that can help analyse the impact of the different factors (van Oijen et al., 2008). The model includes the physiology of coffee plants, and its response to different growing conditions. This is integrated into a plot-scale model of coffee and shade-tree growth that includes competition for light, water and nutrients. The model can simulate management treatrents such as spacing, thinning, pruning and fertilising. Model outputs are the variables that we want the model to calculate, as a function of the inputs. The major outputs of the model are. - Productivity: coffee-bean yield, tree-stem volume. - Environmental impact: rate of N-leaching to groundwater and of N-emission to the atmosphere, rate of loss of organic carbon and nitrogen in surface runoff. We analysed to what extent the literature has sufficient information to allow parameterisation of the model for various coffee-tree combinations. Information on weather, coffee and trees is found to be limited, but soil information seems adequate. In particular, missing are multifactorial experiments to examine interactive effects of different environmental factors. Although model parameterisation thus remains uncertain, model behaviour seems consistent, with observations. We show examples of how the model can be used to examine trade-offs between increasing coffee and tree productivity, and between maximising productivity and limiting the impact of the system on the environment.

Mots-clés Agrovoc : Coffea, agroforesterie, impact sur l'environnement

Mots-clés géographiques Agrovoc : Amérique centrale

Classification Agris : F08 - Systèmes et modes de culture
U10 - Informatique, mathématiques et statistiques
K01 - Foresterie - Considérations générales
P01 - Conservation de la nature et ressources foncières

Auteurs et affiliations

• Van Oijen Marcel, CEH (GBR)
• Dauzat Jean, CIRAD-BIOS-UMR AMAP (FRA)
• Harmand Jean-Michel, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA) ORCID: 0000-0002-8065-106X
• Lawson Gerry, CATIE (CRI)
• Vaast Philippe, CIRAD-PERSYST-UPR Ecosystèmes de plantations (IND)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/553040/)

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