Scaling-up LAI in coffee agroforestry systems in Costa Rica

Taugourdeau Simon, Le Maire Guerric, Roupsard Olivier, Avelino Jacques, Gomez Delgado Federico, Jones Jeffrey R., Marsden Claire, Robelo A., Barquero Alejandra, Alpizar Edgardo, Rapidel Bruno, Vaast Philippe, Harmand Jean-Michel. 2011. Scaling-up LAI in coffee agroforestry systems in Costa Rica. In : Proceedings of the 23rd International Conference on Coffee Science; Bali, Indonesia, October 3-8, 2010 = Actes du 23ème Colloque scientifique international sur le café, Bali, Indonésie, 3-8 octobre 2010. ASIC. Paris : ASIC, 1046-1050. ISBN 978-2-900212-22-6 International Conference on Coffee Science. 23, Bali, Indonésie, 3 Octobre 2010/8 Octobre 2010.

Matériel d'accompagnement : 1 poster

Résumé : Ecosystem Services (ES) provided by coffee plantations may differ according to agricultural practices (monoculture or agroforestry). The leaf area index (LAI) is assumed to be a good parameter to model ecosystem ES. We tested a method to measure leaf area index of coffee agroforestry plantations that display moderate shade or no shade, being valid for a large spatio-temporal scale, relying on a vegetation index (NDVI) derived from satellite imagery (Very High Resolution THRS and medium resolution MODIS). Time series (2001-2009) of LAI were obtained following two steps of calibration: a first calibration between the actual LAI measured in the field and the NDVI THRS image (R ² = 0.80) in order to obtain maps of LAI at high resolution; the second step between the high-resolution LAI map and NDVI from MODIS (R ² = 0.66). We studied the effects of environmental and agronomic factors on LAI. The seasonal dynamics of LAI (2.5 and 4 in the dry season in the wet season) was connected with variations in air humidity and solar radiation. We found that the LAI of some key months was correlated with coffee yield. The dynamic of LAI was also influenced by agricultural practices such as the pruning of coffee. This work is a first step towards spatial modeling of ecosystem services and production.

Mots-clés Agrovoc : agroforesterie, Coffea, modélisation environnementale

Mots-clés géographiques Agrovoc : Costa Rica

Mots-clés complémentaires : Service environnemental

Classification Agris : U30 - Méthodes de recherche
F08 - Systèmes et modes de culture
K01 - Foresterie - Considérations générales
P01 - Conservation de la nature et ressources foncières

Auteurs et affiliations

• Taugourdeau Simon, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA) ORCID: 0000-0001-6561-3228
• Le Maire Guerric, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA) ORCID: 0000-0002-5227-958X
• Roupsard Olivier, CIRAD-PERSYST-UPR Ecosystèmes de plantations (CRI) ORCID: 0000-0002-1319-142X
• Avelino Jacques, CIRAD-BIOS-UPR Bioagresseurs de pérennes (CRI) ORCID: 0000-0003-1983-9431
• Gomez Delgado Federico, CIRAD-PERSYST-UPR Ecosystèmes de plantations (CRI)
• Jones Jeffrey R., CATIE (CRI)
• Marsden Claire
• Robelo A.
• Barquero Alejandra
• Alpizar Edgardo, Ecom Coffee Group (NIC)
• Rapidel Bruno, CIRAD-PERSYST-UMR SYSTEM (CRI) ORCID: 0000-0003-0288-5650
• Vaast Philippe, CIRAD-PERSYST-UPR Ecosystèmes de plantations (IND)
• Harmand Jean-Michel, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA) ORCID: 0000-0002-8065-106X

Source : Cirad - Agritrop (https://agritrop.cirad.fr/560174/)

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