Assessing the accuracy and robustness of a process-based model for coffee agroforestry systems in Central America

Ovalle-Rivera Oriana, Van Oijen Marcel, Läderach Peter, Roupsard Olivier, de Melo Virginio Filho Elias, Barrios Aguirrez Mirna, Rapidel Bruno. 2020. Assessing the accuracy and robustness of a process-based model for coffee agroforestry systems in Central America. Agroforestry Systems, 94 : 2033-2051.

Url - éditeur : https://rdcu.be/b5Lu2

Quartile : Q2, Sujet : AGRONOMY / Quartile : Q2, Sujet : FORESTRY

Résumé : Coffee is often grown in production systems associated with shade trees that provide different ecosystem services. Management, weather and soil conditions are spatially variable production factors. CAF2007 is a dynamic model for coffee agroforestry systems that takes these factors as inputs and simulates the processes underlying berry production at the field scale. There remain, however, uncertainties about process rates that need to be reduced through calibration. Bayesian statistics using Markov chain Monte Carlo algorithms is increasingly used for calibration of parameter-rich models. However, very few studies have employed multi-site calibration, which aims to reduce parameter uncertainties using data from multiple sites simultaneously. The main objectives of this study were to calibrate the coffee agroforestry model using data gathered in long-term experiments in Costa Rica and Nicaragua, and to test the calibrated model against independent data from commercial coffee-growing farms. Two sub-models were improved: calculation of flowering date and the modelling of biennial production patterns. The modified model, referred to as CAF2014, can be downloaded at https://doi.org/10.5281/zenodo.3608877. Calibration improved model performance (higher R2, lower RMSE) for Turrialba (Costa Rica) and Masatepe (Nicaragua), including when all experiments were pooled together. Multi-site and single-site Bayesian calibration led to similar RMSE. Validation on new data from coffee-growing farms revealed that both calibration methods improved simulation of yield and its bienniality. The thus improved model was used to test the effect of N fertilizer and shade in different locations on coffee yield.

Mots-clés Agrovoc : agroforesterie, Coffea arabica, rendement des cultures, modélisation des cultures, méthode statistique, théorie Bayésienne

Mots-clés géographiques Agrovoc : Amérique centrale, Costa Rica, Nicaragua

Mots-clés libres : Agroforestry systems, Bayesian calibration, Coffea arabica, Modelling, Yield

Classification Agris : F08 - Systèmes et modes de culture
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Ovalle-Rivera Oriana, CATIE (CRI)
• Van Oijen Marcel, CEH (GBR) - auteur correspondant
• Läderach Peter, CIAT (COL)
• Roupsard Olivier, CIRAD-PERSYST-UMR Eco&Sols (SEN)
• de Melo Virginio Filho Elias, CATIE (CRI)
• Barrios Aguirrez Mirna, CATIE (CRI)
• Rapidel Bruno, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA) ORCID: 0000-0003-0288-5650

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596177/)

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