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| Titel |
Greenhouse gas emissions from the grassy outdoor run of organic broilers |
| VerfasserIn |
B. Meda, C. R. Flechard, K. Germain, P. Robin, C. Walter, M. Hassouna |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 4 ; Nr. 9, no. 4 (2012-04-20), S.1493-1508 |
| Datensatznummer |
250006956
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| Publikation (Nr.) |
 copernicus.org/bg-9-1493-2012.pdf |
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| Zusammenfassung |
| 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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