Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 4
Biogeosciences, 9, 1493–1508, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Nitrogen and global change

Biogeosciences, 9, 1493–1508, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 20 Apr 2012

Research article | 20 Apr 2012

Greenhouse gas emissions from the grassy outdoor run of organic broilers

B. Meda1,2,3, C. R. Flechard1,2, K. Germain4, P. Robin1,2, C. Walter1,2,5, and M. Hassouna1,2 B. Meda et al.
  • 1INRA, UMR1069 Sol Agro et hydrosystème Spatialisation, 35000 Rennes, France
  • 2Agrocampus Ouest, 35000 Rennes, France
  • 3INRA, UR83 Recherches Avicoles, 37380 Nouzilly, France
  • 4INRA, UE1206 Élevage alternatif et santé des monogastriques, Domaine du Magneraud, 17700 Saint-Pierre-d'Amilly, France
  • 5Université Européenne de Bretagne, Rennes, France

Abstract. Nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) fluxes over the grassy outdoor run of organically grown broilers were monitored using static chambers over two production batches in contrasted seasons. Measured N2O and CH4 fluxes were extremely variable in time and space for both batches, with fluxes ranging from a small uptake by soil to large emissions peaks, the latter of which always occurred in the chambers located closest to the broiler house. In general, fluxes decreased with increasing distance to the broiler house, demonstrating that the foraging of broilers and the amount of excreted nutrients (carbon, nitrogen) largely control the spatial variability of emissions. Spatial integration by kriging methods was carried out to provide representative fluxes on the outdoor run for each measurement day. Mechanistic relationships between plot-scale estimates and environmental conditions (soil temperature and water content) were calibrated in order to fill gaps between measurement days. Flux integration over the year 2010 showed that around 3 ± 1 kg N2O-N ha−1 were emitted on the outdoor run, equivalent to 0.9% of outdoor N excretion and substantially lower than the IPCC default emission factor of 2%. By contrast, the outdoor run was found to be a net CH4 sink of about −0.56 kg CH4-C ha−1, though this sink compensated less than 1.5% (in CO2 equivalents) of N2O emissions. The net greenhouse gas (GHG) budget of the outdoor run is explored, based on measured GHG fluxes and short-term (1.5 yr) variations in soil organic carbon.

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