Metay A. auteur aut IRD Chapuis Lardy Lydie auteur aut IRD Findeling A. auteur aut IRD Oliver R. auteur aut IRD Moreira J. A. A. auteur aut IRD Feller Christian auteur aut IRD text journalArticle eng text/pdf born digital access Assessing the N2O fluxes balance is a key challenge to estimate the effect of agriculture practices on greenhouse gas production. N2O fluxes remained difficult to measure on a field scale due to high spatial and temporal variability and usually low concentrations. Our work aimed at (i) characterizing by laboratory measurements soil potential N2O emissions from nitrification and denitrification and (ii) testing a modelling approach of N2O emissions that circumvents the problem of discrete measurements for two Brazilian rainfed rice cropping systems, no-tillage (NT) vs. disk tillage (DT). This latter approach consisted in the combination of 2 models: a mechanistic water transfer model and a N2O emission model, namely PASTIS and NOE. Simulations with the PASTIS + NOE approach showed for both NT and DT treatments that: (i) the soil emitted low amounts of N2O, (ii) emissions by denitrification corresponded to short periods of high N2O emissions (15 times as high as emission by nitrification), (iii) nitrification contributed to ca 35% of the total N2O emissions at the crop cycle scale, (iv) field N2O emission measurements corresponded to the low bound of simulated emissions from nitrification. specialized N2O fluxes Cropping systems Tropical soils Modelling Denitrification Nitrification 068 140 1-2 255-263 2011 0167-8809 https://www.documentation.ird.fr/hor/fdi:010053176 10.1016/j.agee.2010.12.012 0167-8809 [F B010053176] https://www.documentation.ird.fr/hor/fdi:010053176 https://www.documentation.ird.fr/intranet/publi/2011/03/010053176.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-04-07 2017-08-23 fdi:010053176 fre