Effect of cocoa pod decomposition on earthworm density in agroforestry systems of the Dominican Republic

Marichal Raphaël, Guittonneau Marie, Deheuvels Olivier. 2022. Effect of cocoa pod decomposition on earthworm density in agroforestry systems of the Dominican Republic. . INRAE, Institut agro Rennes, Institut agro Angers, Université de Rennes 1, Institut agro Dijon, IRD, CNRS. Rennes : INRAE, Résumé, 1 p. International Symposium on Earthworm Ecology (ISEE12). 12, Rennes, France, 10 Juillet 2022/15 Juillet 2022.

Matériel d'accompagnement : 1 poster

Résumé : Cocoa-based agroforestrysystems (Cocoa AFS), that combine at least onecropin association withcocoa trees, often aim at optimizing ecological and economical interactions among their components. CocoaAFS have been widely described in the literature for their high taxonomic and functionaldiversity, includingthe soil biota. However, in these agrosystems the interactions between agricultural practices and earthworm communities are poorly documented. A common harvestingpractice all over cocoa producing countries consists in piling the harvested cocoapods on a determined area of the plantation floor before opening them. The cocoa beans are extracted and carried out of the plantationsfor further post-harvesting processes, but pod husks remain and decompose on the ground.We compared earthworm densities and some morphological traits (length and body mass) under cacao pods and leaf litterin 42cocoa AFS distributed among 4 age classes:0-3, 4-10, 11-25 and > 70 yearsin the Dominican Republic. The TSBF method was implemented: extraction of 25 x 25 cm, 20 cm depth soil monolith and hand sorting of earthworms (total of 120 TSBF). Earthworm densities were calculated and morphological traits measured. Earthworm densities were significantly higher under cacao pods than leaf litter.Earthworm lengths were slightly higher under cacao pods than under leaf litter in 11-25 years age class. Cocoa pods decomposition lead to earthworm densities increasing and, consequently,to a stimulation of ecological functions that they provide. Further studies are needed to confirmthese results, that could lead toa recommendation to spread pod husks over the plantation floor when harvesting cocoa, taking into accountthe current sanitary recommendations for harvesting.

Auteurs et affiliations

• Marichal Raphaël, CIRAD-PERSYST-UMR ABSys (GUF) ORCID: 0000-0001-9070-5749
• Guittonneau Marie, ISARA (FRA)
• Deheuvels Olivier, CIRAD-PERSYST-UMR ABSys (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/606610/)

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