The Rock-Eval® signature of soil organic carbon in arenosols of the Senegalese groundnut basin. How do agricultural practices matter?

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dc.contributor.authorMalou, Oscar Pascal
dc.contributor.authorSebag, David
dc.contributor.authorMoulin, Patricia
dc.date.accessioned2023-04-26T16:17:18Z
dc.date.available2023-04-26T16:17:18Z
dc.date.issued2020-10
dc.descriptionAgriculture, Ecosystems & Environment, Volume 301,en_US
dc.description.abstractSoil organic carbon (SOC) ensures soil quality and productivity of cultivated systems in the Sahelian region. This study uses Rock-Eval® pyrolysis to examine how cultural practices impact the quantity of SOC and quality of SOM in cultivated sandy soils in the Senegal groundnut basin. This cost-effective method provides information on SOC thermal stability, which has been shown to be related qualitatively to biogeochemical stability of SOC. We sampled soils within two villages in agricultural plots representative of local agricultural systems, and in two local preserved areas (tree plantation and shrubby savanna). SOC concentrations ranged from 1.8–18.5 g.kg−1 soil in the surface layer (0−10 cm) and from 1.5–11.3 g.kg−1 soil in the 10−30 cm layer. SOC contents of cultivated soils decreased significantly (p-value < 0.0001) according to field amendment, in the following order: addition of organic wastes> addition of manure > millet residues left after harvest > no organic input. We found that the quantity and the quality of SOC are linked, and that both depend on land-use and agricultural practices, especially upon the type of organic inputs. Quantity of SOC and quality of SOM are correlated strongly in the tree plantation (R² = 0.98) and in the protected shrubby savanna (R² = 0.97). They are also correlated significantly in cultivated soils receiving organic wastes (R² = 0.82), manure (R² from 0.74 and 0.91), or millet residues (R2 = 0.91) but not in soils that receive no organic inputs. Indexes based upon Rock-Eval® pyrolysis were represented in an I/R diagram that illustrates the level of SOC stabilization. The indexes of the studied soils were plotted against comparable results from literature. Thermal signatures of the Senegalese Arenosols show an inversion of I and the R indexes compared to data from the literature. This result highlights SOC stabilization as a function of soil depth. Indeed, the refractory pool in the studied soils (where refractory pool ranged from 7.7–21.3 % in the 0−10 cm layer, and from 12.5–24.3 % in the 10−30 cm) was more abundant than in Ferralsols in natural conditions, where refractory pool ranged from 2 to 9%. The soil organic matter in these Arenosols while positively affected by organic inputs, is dominated by more or less labile forms that mineralize quickly: a quality that is excellent for productivity of these agrosystems, but not for mitigation of climate change in the long term.en_US
dc.description.sponsorshipACE Impact: Agriculture for Food and Nutrition Security, AGRISANen_US
dc.identifier.citationMalou, O. P., Sebag, D., Moulin, P., Chevallier, T., Badiane-Ndour, N. Y., Thiam, A., & Chapuis-Lardy, L. (2020). The Rock-Eval® signature of soil organic carbon in arenosols of the Senegalese groundnut basin. How do agricultural practices matter?. Agriculture, Ecosystems & Environment, 301, 107030.en_US
dc.identifier.uridoi.org/10.1016/j.agee.2020.107030
dc.identifier.urihttps://datad.aau.org/handle/123456789/1602
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectAgrosystemsen_US
dc.subjectOrganic inputsen_US
dc.subjectThermal analysisen_US
dc.subjectRock-Eval® pyrolysisen_US
dc.subjectWest Africaen_US
dc.subjectAGRISANen_US
dc.subjectUniversité Cheikh Anta Diopen_US
dc.subjectSénégalen_US
dc.subjectLydie Chapuis-Lardyen_US
dc.subjectAbou Thiamen_US
dc.subjectNdeye Yacine Badiane-Ndouren_US
dc.subjectTiphaine Chevallieren_US
dc.titleThe Rock-Eval® signature of soil organic carbon in arenosols of the Senegalese groundnut basin. How do agricultural practices matter?en_US
dc.typeArticleen_US
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