Long-term dynamics of cocoa agroforestry systems established on lands previously occupied by savannah or forests

Nijmeijer Annemarijn, Lauri Pierre-Eric, Harmand Jean-Michel, Freschet Grégoire T., Essobo Nieboukaho Jean-Daniel, Kenfack Fogang Patrick, Enock Seguy, Saj Stéphane. 2019. Long-term dynamics of cocoa agroforestry systems established on lands previously occupied by savannah or forests. Agriculture, Ecosystems and Environment, 275 : 100-111.

Quartile : Outlier, Sujet : AGRICULTURE, MULTIDISCIPLINARY / Quartile : Q1, Sujet : ECOLOGY / Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES

Résumé : Cocoa agroforestry systems (cAFS) in Central Cameroon are established on lands which were either forest or savannah. The functioning and ecosystem services (ES) delivery of an agroecosystem can be influenced by past land-use. We hypothesised that savannah-derived cocoa agroforestry systems (S-cAFS) and forest-derived cocoa agroforestry systems (F-cAFS) would (i) progressively drift away from past land-use, and (ii) eventually converge and support comparable levels of ecosystem services. We selected 25 ecosystem attributes directly related to at least one of the following six ecosystem (dis)services (ES): species conservation, carbon storage, crop production, nutrient cycling, soil quality and soil pollution. We followed their temporal evolution in S- and F-cAFS along >70-year chronosequences. Our results showed that the attributes and services studied followed typical temporal trajectories in S- and F-cAFS while generally tending to reach comparable levels on the long run. However, the time needed to do so varied strongly and ranged from 20 to 30 years for perennial species diversity to more than 70 years for C storage or some components of soil quality. The results also demonstrated that S-cAFS could sustainably improve many of the studied attributes and ES. Regarding the attributes related to the cocoa stand, both S- and F-cAFS seemed influenced by their previous land-use up until 15 and 30 years, respectively, after their establishment. With respect to soil quality, nutrient cycling and carbon storage, only S-cAFS could be significantly distinguished from their past land-use, after 15 to 30 years.

Mots-clés Agrovoc : Theobroma cacao, agroforesterie, services écosystémiques, fertilité du sol, savane

Mots-clés géographiques Agrovoc : Cameroun

Mots-clés libres : Afforestation, Ecosystem services, Theobroma cacao, Land-use legacies, Soil quality

Classification Agris : F08 - Systèmes et modes de culture
P01 - Conservation de la nature et ressources foncières
P35 - Fertilité du sol

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

Auteurs et affiliations

• Nijmeijer Annemarijn, CIRAD-PERSYST-UMR SYSTEM (FRA)
• Lauri Pierre-Eric, INRA (FRA)
• Harmand Jean-Michel, CIRAD-PERSYST-UMR Eco&Sols (CMR) ORCID: 0000-0002-8065-106X
• Freschet Grégoire T., IRD (FRA)
• Essobo Nieboukaho Jean-Daniel, IRAD (CMR)
• Kenfack Fogang Patrick, IRAD (CMR)
• Enock Seguy, Université de Montpellier (FRA)
• Saj Stéphane, CIRAD-PERSYST-UMR SYSTEM (FRA) ORCID: 0000-0001-5856-5459 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591540/)

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