Effect of biomass management regimes and wetting-drying cycles on soil carbon mineralization in a Sudano-Sahelian region

Yemadje Pierrot Lionel, Guibert Hervé, Chevallier Tiphaine, Deleporte Philippe, Bernoux Martial. 2016. Effect of biomass management regimes and wetting-drying cycles on soil carbon mineralization in a Sudano-Sahelian region. Journal of Arid Environments, 127 : 1-6.

https://doi.org/10.1016/j.jaridenv.2015.10.017

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Quartile : Q2, Sujet : ENVIRONMENTAL SCIENCES / Quartile : Q3, Sujet : ECOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Géographie-Aménagement-Urbanisme-Architecture

Résumé : In Sudano-Sahelian regions, wetting-drying cycles may affect soil carbon mineralization in soil already poor in carbon. Conservation agriculture systems by improving crop residues return to soil is given to increase soil organic carbon and soil fertility. We studied the effect of biomass management regimes and wetting-drying cycles on soil carbon stocks and mineralization. A 50-day experiment was set up to compare carbon mineralization under two biomass management regimes, with and without mulch, using three soil wetting treatments. Wetting the soil and mulching increased soil carbon mineralization. However, wetting-drying cycles did not increase the soil carbon mineralization as compared with soils kept moist. During the experiment, the total carbon mineralization from the dry soils was low, 0.63 tC ha−1 and 0.53 tC ha−1 respectively for soils with and without mulch. Total carbon mineralization from soil without mulch was 1.40 tC ha−1 with wetting-drying cycles and 1.51 tC ha−1 for soils that were kept moist. Total carbon mineralization from soils with mulch was 1.70 tC ha−1, regardless of whether the soils had wetting-drying cycles or were kept moist. In our context, characterized by very little crop residues and rapid mineralization of this biomass, the conservation agriculture systems do not seem sufficient to increase soil organic carbon stocks.

Mots-clés Agrovoc : carbone, matière organique du sol, minéralisation du carbone, régime hydrique du sol, teneur en eau, respiration du sol, agriculture alternative, pratique culturale, paillage

Mots-clés géographiques Agrovoc : Cameroun, Zone soudano-sahélienne

Mots-clés complémentaires : Agriculture de conservation

Classification Agris : P33 - Chimie et physique du sol
P40 - Météorologie et climatologie
F08 - Systèmes et modes de culture

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

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