@article{fdi:010042581,
  title = {{A}ggregate associated-{C} and physical protection in a tropical clayey soil under {M}alagasy conventional and no-tillage systems},
  author = {{R}azafimbelo, {T}antely and {A}lbrecht, {A}lain and {O}liver, {R}. and {C}hevallier, {T}iphaine and {C}hapuis {L}ardy, {L}ydie and {F}eller, {C}hristian},
  editor = {},
  language = {{ENG}},
  abstract = {{S}hare-ploughed tillage with residue removed ({CT}-{R}) is the traditional tillage practice in the {H}ighlands of {M}adagascar. {N}o-tillage with residue mulching ({NT}+{R}) is nowadays often used as an alternative cultivation practice. {S}oils (0-5 cm layer) were sampled in {S}pring 2003 from both management systems after {I} {I} years of soybean-maize annual rotation on a clayey {F}erralsol. {S}oil aggregate stability can influence soil organic carbon ({SOC}) storage by its protection from microbial decomposition. {T}he soil organic carbon ({SOC}) content was significantly impacted by systems and crop residues derived-carbon represented 64% of the annual benefit in {SOC} of {NT}+{R} system. {T}he carbon associated with soil water stable macro- (200-2000 mu m), meso- (20-200 mu m) and microaggregates (< 20 mu m) from both systems, and their physical protection was studied by an incubation experiment of intact vs. crushed aggregates. {R}esults showed macroaggregate content was significantly higher in {NT}+{R} than in {CT}-{R} system and mesoaggregate content was significantly higher in {CT}-{R} than in {NT}+{R}. {M}acroaggregates associated-{C} were 1.8 time higher in {NT}+{R} than in {CT}-{R} (31.9 and 17.9 g {C} g(-1) soil, respectively) and made up the largest percentage (> 80%) of the difference of {SOC} content between {NT}+{R} and {CT}-{R} systems. {T}he amount of mineralized {C} over 28 days was higher in {NT}+{R} than in {CT}-{R}, and higher in meso- than in macroaggregates. {H}owever, crushing aggregates did not significantly affect the amount of mineralized {C} in macro- and mesoaggregates for both management systems. {T}he macro- and mesoaggregates protected-{C} was lower than 54 mu g g(-1) soil for both {NT}+{R} and {CT}-{R} systems. {H}ence, the physical protection of {C} in aggregate larger than 50 mu m was not the main process of {C} protection in the studied systems. {T}hus, {C} protection might occur in aggregates larger or smaller than 50 mu m via physico-chemical protection mechanisms by association of organic matter to clay and silt fractions, or by protection due to chemical composition.},
  keywords = {aggregate associated carbon ; mineralization ; physical protection ; no tillage ; residues mulching},
  booktitle = {},
  journal = {{S}oil and {T}illage {R}esearch},
  volume = {98},
  numero = {2},
  pages = {140--149},
  ISSN = {0167-1987},
  year = {2008},
  DOI = {10.1016/j.still.2007.10.012},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042581},
}