Trade-offs between production and tree biodiversity in coffee agroforests of Guinea and their contribution to landscape resilience and farmers livelihood - Agropolis Accéder directement au contenu
Communication Dans Un Congrès Année : 2011

Trade-offs between production and tree biodiversity in coffee agroforests of Guinea and their contribution to landscape resilience and farmers livelihood

Résumé

Coffee agroforests are typical of the multi-strata cropping systems for which there is a growing interest as a pathway towards sustainable agriculture. Due to their pluri-specificity, they provide interesting trade-offs between services and productions that participate to resilience of tropical landscapes and of farmers livelihoods. There is however still little knowledge about the trade-offs between coffee yield (one of the components of production) and tree biodiversity (one of the component of ecosystems services) on the basis of field observations. Our study aims to assess these trade-offs on coffee agroforest plots in the region of Guinée Forestière (Guinea). We sampled 27 coffee agroforest plots clustered into three shade levels over the coffee stand. On each plot, we characterized (i) canopy structure, (ii) tree biodiversity (iii) coffee yield and (iv) farmers’ practices. Data were also collected on forest stands as well as monocrop coffee stands to be used as reference of tree biodiversity and coffee production respectively. Coffee plant density was around 1030 (±330) ha-1 without significant difference between the shade levels groups. Tree biodiversity of mature trees and tree seedling was significantly higher in forest than in agroforest plots. Within agroforest plots, diversity of mature trees was higher in high shade plots than in low shaded plots, whereas tree seedling diversity was similar among the shade levels. Coffee yield decreased when shade cover increased on coffee stands (r²: 0.36), with significant differences of yield per coffee plant and per ha between the high shade (129 ± 161 kg. ha-1.year-1) and low shade plots (1002 ± 735 kg. ha-1.year-1). The level of intensification of farmers’ practices was not correlated with coffee yield and tree biodiversity. Despite a high variability within a shade level group, coffee yield and mature tree biodiversity were significantly correlated and their relationship followed a concave form. Using natural forest as a reference for tree biodiversity and monocrop coffee fields as a reference for yield, discuss the tradeoffs between economic return from production and biodiversity conservation and how cropping system structure and management could help to shift the relationships towards a convex curve. Among medium shade coffee agroforest plots, some fields suggest a significant leeway to design agroforest structure and to manage their input in order to combine, in a profitable way, the production of coffee berry and ecosystems services mediated through tree diversity. Including the products from other plants during the lifetime of the agroforest provides additional leeway in the search for the best trade-offs between farmers’ livelihoods and landscape resilience.
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Dates et versions

hal-01506115 , version 1 (12-04-2017)

Identifiants

  • HAL Id : hal-01506115 , version 1
  • PRODINRA : 166758

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Nathalie Lamanda, Jacques Wéry. Trade-offs between production and tree biodiversity in coffee agroforests of Guinea and their contribution to landscape resilience and farmers livelihood. Conférence internationale de l' Association for Tropical Biology and Conservation & Africa Section of the Society for Conservation Biology, Association of Tropical Biology and Conservation (ATBC). érence internationale de l'Association for Tropical Biology and Conservation & Africa Section of the Society for Conservation Biology, Ville service, INT., Jun 2011, NA, France. ⟨hal-01506115⟩
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