@article{fdi:010070970,
  title = {{W}etting-drying cycles do not increase organic carbon and nitrogen mineralization in soils with straw amendment},
  author = {{Y}emadje, {P}. {L}. and {C}hevallier, {T}iphaine and {G}uibert, {H}. and {B}ertrand, {I}. and {B}ernoux, {M}artial},
  editor = {},
  language = {{ENG}},
  abstract = {{I}ncreasing soil organic matter ({SOM}) is of primary importance for maintaining soil fertility and mitigating climate change. {L}eaving crop residues on top of soil is not always an efficient means of increasing {SOM} because (i) of the high mineralization of the crop residues, (ii) crop residues may increase the mineralization of existing {SOM} (priming effect) and (iii) wetting-drying cycles may increase mineralization of {SOM} and crop residues. {L}ittle research has been carried out into these mechanisms under {S}udano-{S}ahelian conditions where the rainfall is mostly irregular with wetting-drying cycles during the transition between the wet and the dry season. {T}o evaluate the effect of wetting-drying cycles on the mineralization of {SOM} and crop residues and the priming effect, an agricultural soil from the {N}orth {R}egion of {C}ameroon with or without (controls) {C}-13-labeled rice straw amendment as crop residues was either subjected to five wetting-drying cycles or maintained at constant water potential after a single rewetting event. {S}oil samples were incubated for 70 days at 28 degrees {C} and the {CO}2 and ({CO}2)-{C}-13 emissions and mineral {N} were monitored. {A}dding straw (+ 833 mu g {C} g(-1) soil) increased the cumulative {CO}2 emissions from the soil (+921 mu g {C}-{CO}2 g(-1-) soil). {A} positive priming effect was observed (+92 mu g {C}-{CO}2 g(-1) soil). {O}nly the first wetting cycle created a mineralization flush of the {SOM} and the straw. {T}his flush did not recur probably because of a lack of labile {SOM}. {H}owever an extra addition of straw after 28 days increased {CO}2 emissions but did not result in further mineralization flushes after re-wetting while {SOM} mineralization was not limited by {N} availability. {W}e conclude that {SOM} depletion under {S}udano-{S}ahelian conditions was not explained by {SOM} mineralization enhancement due to multiple rewetting events or to priming effect following crop residues addition. {I}ndeed, {SOM} depletion could rather be explained by a high level of mineralization of both, {SOM} and crop residues, when the soil reached its water retention capacity.},
  keywords = {{P}riming effect ; {W}etting-drying cycles ; {S}oil organic carbon mineralization ; {N}itrogen ; {R}esidues ; {C}-13 isotope ; {CAMEROUN} ; {ZONE} {SOUDANIENNE} ; {ZONE} {SAHELIENNE}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {304},
  numero = {{SI}},
  pages = {68--75},
  ISSN = {0016-7061},
  year = {2017},
  DOI = {10.1016/j.geoderma.2016.06.023},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070970},
}