@article{fdi:010079397,
  title = {{T}he {R}ock-{E}val ({R}) signature of soil organic carbon in arenosols of the {S}enegalese groundnut basin : how do agricultural practices matter ?},
  author = {{M}alou, {O}. {P}. and {S}ebag, {D}avid and {M}oulin {E}smard, {P}atricia and {C}hevallier, {T}iphaine and {B}adiane-{N}dour, {N}. {Y}. and {A}bou, {T}hiam and {C}hapuis {L}ardy, {L}ydie},
  editor = {},
  language = {{ENG}},
  abstract = {{S}oil organic carbon ({SOC}) ensures soil quality and productivity of cultivated systems in the {S}ahelian region. {T}his study uses {R}ock-{E}val ({R}) pyrolysis to examine how cultural practices impact the quantity of {SOC} and quality of {SOM} in cultivated sandy soils in the {S}enegal groundnut basin. {T}his cost-effective method provides information on {SOC} thermal stability, which has been shown to be related qualitatively to biogeochemical stability of {SOC}. {W}e 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 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. {W}e 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. {Q}uantity of {SOC} and quality of {SOM} are correlated strongly in the tree plantation ({R}-2 = 0.98) and in the protected shrubby savanna ({R} = 0.97). {T}hey are also correlated significantly in cultivated soils receiving organic wastes ({R}-2 = 0.82), manure ({R}-2 from 0.74 and 0.91), or millet residues ({R}-2 = 0.91) but not in soils that receive no organic inputs. {I}ndexes based upon {R}ock-{E}val ({R}) pyrolysis were represented in an {I}/{R} diagram that illustrates the level of {SOC} stabilization. {T}he indexes of the studied soils were plotted against comparable results from literature. {T}hermal signatures of the {S}enegalese {A}renosols show an inversion of {I} and the {R} indexes compared to data from the literature. {T}his result highlights {SOC} stabilization as a function of soil depth. {I}ndeed, 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 {F}erralsols in natural conditions, where refractory pool ranged from 2 to 9%. {T}he soil organic matter in these {A}renosols 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.},
  keywords = {{A}grosystems ; {O}rganic inputs ; {T}hermal analysis ; {R}ock-{E}val ({R}) pyrolysis ; {W}est {A}frica ; {SENEGAL} ; {ZONE} {SAHELIENNE}},
  booktitle = {},
  journal = {{A}griculture {E}cosystems and {E}nvironment},
  volume = {301},
  numero = {},
  pages = {107030 [12 ]},
  ISSN = {0167-8809},
  year = {2020},
  DOI = {10.1016/j.agee.2020.107030},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079397},
}