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

Charbonnier, Fabien Sylvain Jacky | Roupsard, Olivier [autor/a] | Le Maire, Guerric [autor/a] | Guillemot, Joannès [autor/a] | Casanoves, Fernando [autor/a] | Lacointe, André [autor/a] | Vaast, Philippe [autor/a] | Allinne, Clémentine [autor/a] | Audebert, Louise [autor/a] | Cambou, Aurélie [autor/a] | Clément Vidal, Anne [autor/a] | Defrenet, Elsa [autor/a] | Duursma, Remko A [autor/a] | Jarri, Laura [autor/a] | Jourdan, Christophe [autor/a] | Khac, Emmanuelle [autor/a] | Leandro, Patricia [autor/a] | Medlyn, Belinda E [autor/a] | Saint André, Laurent [autor/a] | Thaler, Philippe [autor/a] | Van den Meersche, Karel [autor/a] | Barquero Aguilar, Alejandra [autor/a] | Lehner, Peter [autor/a] | Dreyer, Erwin [autor/a].
Tipo de material: Artículo
 en línea Artículo en línea Tema(s): Coffea arabica | Árboles de sombra | Productividad agrícola | Biomasa | Competencia interespecífica | Cafetal | Sistemas agroforestalesTema(s) en inglés: Coffea arabica | Shade trees | Agricultural productivity | Biomass | Interspecific competition | Coffee plantations | Agroforestry systemsDescriptor(es) geográficos: Turrialba (Costa Rica) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Plant, Cell and Environment. volumen 40, número 8 (Jun 2017), páginas 1592-1608. --ISSN: 1365-3040Número de sistema: 58389Resumen:
Inglés

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.

Recurso en línea: http://onlinelibrary.wiley.com/doi/10.1111/pce.12964/abstract;jsessionid=B4E8154B5D42E0DBB7280AB53302D313.f04t01
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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. eng

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