@inproceedings{fdi:010085505,
  title = {{I}s the thermal stability of soil organic matter related to its biogeochemical stability in cultivated {A}renosols of the groundnut basin of {S}enegal ? [r{\'e}sum{\'e}]},
  author = {{M}alou, {O}.{P}. and {C}hevallier, {T}iphaine and {S}ebag, {D}. and {M}oulin, {P}atricia and {N}dour, {N}.{Y}.{B}. and {R}akotondrazafy, {N}ancy and {T}hiam, {A}. and {C}hapuis-{L}ardy, {L}ydie},
  editor = {},
  language = {{ENG}},
  abstract = {{S}oil carbon ({C}), now more than ever, attracts the interest of the scientific community for its importance in combating climate change and achieving food security. {A}s a result, its key role in agricultural soil fertility and in anthropogenic greenhouse gas emissions mitigation is high on international agendas. {A} key issue regarding the linkage between food security and carbon storage concerns the mineralization or the stability of soil organic matter ({SOM}). {R}ock-{E}val® analysis was used to examine the thermal stability of {SOM} and these results were presented in details at the {EGU} {G}eneral {A}ssembly in 2020 ({EGU}2020-11229). {S}everal indicators are used to further appreciate the quantity and quality of {SOM}: particle size fractionation ({POM}-{C}), determination of permanganate oxidizable carbon ({POX}-{C}) and carbon mineralization kinetics ({M}in-{C}). {T}he results of both approaches are crossed and presented here. {S}oils were sampled from two soil layers (0-10 et 10-30 cm) in agricultural plots representative organic inputs practices in local agricultural systems ({N}o input, +{M}illet residues, +{M}anure and +{O}rganic wastes). {T}otal soil organic carbon ({SOC}) concentrations ranged from 1.8 to 18.5 g {C}.kg-1 soil (mean ± standard deviation: 5.6 ± 0.4 g {C}.kg-1 soil) in the surface layer (0-10 cm) and from 1.5 to 11.3 g {C}.kg-1 soil (mean ± standard deviation: 3.3 ± 0.2 g {C}.kg-1 soil) in 10-30 cm deep layer. {T}he soil organic matter in these {A}renosols while positively affected by organic inputs is dominated by thermally labile forms. {T}he {POM}-{C} fractions represent respectively 45 % and 24 % of the {COS} in the 0-10 cm and 10-30 cm soil layers respectively. {P}ermanganate oxidizable carbon ({POX}-{C}) and mineralizable {C} ({M}in-{C}) averaged 254 ± 14 mg {C}.kg-1 soil and 10.7 ± 1.2 mg {C}-{CO}2 kg-1 soil in the 0-10 cm layer. {O}ur results show that in different situations, the labile pools {POM}-{C}, {POX}-{C} and {M}in-{C} are linked to the active thermal pools {A}1 (highly labile pool), {A}2 (labile pool), {A}3 (resistant pool) and even {A}4 (refractory pool). {T}he {A}3 and {A}4 pools, which are known to be relatively stable in more clayey soils, are in fact quickly mineralized in the sandy soils of this region. {T}his intense mineralization of {SOM} promotes the recycling of nutrients which is excellent for productivity of these agrosystems, but not for mitigation of climate change in the long term.},
  keywords = {{SENEGAL}},
  numero = {},
  pages = {{EGU}21--12211 [2 ]},
  booktitle = {},
  year = {2021},
  DOI = {10.5194/egusphere-egu21-12211},
  URL = {https://www.documentation.ird.fr/hor/fdi:010085505},
}