Increased light-use efficiency sustains net primary productivity of shaded coffee plants in agroforestry system

Charbonnier Fabien, Roupsard Olivier, Le Maire Guerric, Guillemot Joannès, Casanoves Fernando, Lacointe André, Vaast Philippe, Allinne Clémentine, Audebert Louise, Cambou Aurélie, Clément-Vidal Anne, Defrenet Elsa, Duursma Remko A., Jarri Laura, Jourdan Christophe, Khac Emmanuelle, Leandro Patricia, Medlyn Belinda E., Saint André Laurent, Thaler Philippe, Van den Meersche Karel, Barquero Aguilar Alejandra, Lehner Peter, Dreyer Erwin. 2017. Increased light-use efficiency sustains net primary productivity of shaded coffee plants in agroforestry system. Plant, Cell and Environment, 40 (8) : 1592-1608.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : In agroforestry systems, shade trees strongly affect the physiology of the undergrown crop. However, a major paradigm is that the reduction in absorbed photosynthetically active radiation is, to a certain extent, compensated by an increase in light-use efficiency, thereby reducing the difference in net primary productivity between shaded and non-shaded plants. Due to the large spatial heterogeneity in agroforestry systems and the lack of appropriate tools, the combined effects of such variables have seldom been analysed, even though they may help understand physiological processes underlying yield dynamics. In this study, we monitored net primary productivity, during two years, on scales ranging from individual coffee plants to the entire plot. Absorbed radiation was mapped with a 3D model (MAESPA). Light-use efficiency and net assimilation rate were derived for each coffee plant individually. We found that although irradiance was reduced by 60% below crowns of shade trees, coffee light-use efficiency increased by 50%, leaving net primary productivity fairly stable across all shade levels. Variability of aboveground net primary productivity of coffee plants was caused primarily by the age of the plants and by intraspecific competition among them (drivers usually overlooked in the agroforestry literature) rather than by the presence of shade trees.

Mots-clés Agrovoc : agroforesterie, lumière, photosynthèse, biomasse, plante d'ombrage, arbre d'ombrage, rendement des cultures, séquestration du carbone, Coffea arabica, âge, compétition végétale, compétition biologique

Mots-clés géographiques Agrovoc : Brésil, Viet Nam

Mots-clés libres : Carbon allocation, Coffea arabica, Light absorption, Model, MAESPA, Net assimilation rate (NAR)

Classification Agris : F60 - Physiologie et biochimie végétale
F08 - Systèmes et modes de culture

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Charbonnier Fabien, CONACYT (ECU)
• Roupsard Olivier, CIRAD-PERSYST-UMR Eco&Sols (CRI) ORCID: 0000-0002-1319-142X
• Le Maire Guerric, CIRAD-PERSYST-UMR Eco&Sols (BRA) ORCID: 0000-0002-5227-958X
• Guillemot Joannès, CIRAD-PERSYST-UMR Eco&Sols (BRA) ORCID: 0000-0003-4385-7656
• Casanoves Fernando, CATIE (CRI)
• Lacointe André, INRA (FRA)
• Vaast Philippe, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Allinne Clémentine, CIRAD-PERSYST-UMR SYSTEM (CRI) ORCID: 0000-0002-8147-5977
• Audebert Louise
• Cambou Aurélie
• Clément-Vidal Anne, CIRAD-BIOS-UMR AGAP (FRA)
• Defrenet Elsa
• Duursma Remko A., Western Sydney University (AUS)
• Jarri Laura
• Jourdan Christophe, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0001-9857-3269
• Khac Emmanuelle
• Leandro Patricia, CATIE (CRI)
• Medlyn Belinda E., Western Sydney University (AUS)
• Saint André Laurent, INRA (FRA)
• Thaler Philippe, CIRAD-PERSYST-UMR Eco&Sols (THA) ORCID: 0000-0002-9924-4309
• Van den Meersche Karel, CIRAD-PERSYST-UMR Eco&Sols (CRI) ORCID: 0000-0002-0866-7657
• Barquero Aguilar Alejandra, Cafetalera Aquiares (CRI)
• Lehner Peter, Cafetalera Aquiares (CRI)
• Dreyer Erwin, INRA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/584641/)

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