Compost addition reduces porosity and chlordecone transfer in soil microstructure

Woignier Thierry, Clostre Florence, Fernandes Paula, Rangon Luc, Soler Alain, Lesueur Jannoyer Magalie. 2016. Compost addition reduces porosity and chlordecone transfer in soil microstructure. Environmental Science and Pollution Research, 23 (1) : 98-108.

https://doi.org/10.1007/s11356-015-5111-5

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Quartile : Q2, Sujet : ENVIRONMENTAL SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Chlordecone, an organochlorine insecticide, pollutes soils and contaminates crops and water resources and is biomagnified by food chains. As chlordecone is partly trapped in the soil, one possible alternative to decontamination may be to increase its containment in the soil, thereby reducing its diffusion into the environment. Containing the pesticide in the soil could be achieved by adding compost because the pollutant has an affinity for organic matter. We hypothesized that adding compost would also change soil porosity, as well as transport and containment of the pesticide. We measured the pore features and studied the nanoscale structure to assess the effect of adding compost on soil microstructure. We simulated changes in the transport properties (hydraulic conductivity and diffusion) associated with changes in porosity. During compost incubation, the clay microstructure collapsed due to capillary stresses. Simulated data showed that the hydraulic conductivity and diffusion coefficient were reduced by 95 and 70 % in the clay microstructure, respectively. Reduced transport properties affected pesticide mobility and thus helped reduce its transfer from the soil to water and to the crop. We propose that the containment effect is due not only to the high affinity of chlordecone for soil organic matter but also to a trapping mechanism in the soil porosity.

Mots-clés Agrovoc : chlordécone, compost, porosité du sol, pollution du sol, insecticide organochloré, matière organique du sol, pesticide, mouvement de l'eau dans le sol, pollution de l'eau, ressource en eau

Mots-clés géographiques Agrovoc : France

Classification Agris : F04 - Fertilisation
P33 - Chimie et physique du sol
H02 - Pesticides
P02 - Pollution

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

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