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| Titel |
Nitrous oxide emissions from crop rotations including wheat, oilseed rape and dry peas |
| VerfasserIn |
M. H. Jeuffroy, E. Baranger, B. Carrouée, E. Chezelles, M. Gosme, C. Hénault, A. Schneider, P. Cellier |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2013-03-18), S.1787-1797 |
| Datensatznummer |
250018155
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| Publikation (Nr.) |
 copernicus.org/bg-10-1787-2013.pdf |
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| Zusammenfassung |
| Approximately 65% of anthropogenic emissions of N2O, a potent
greenhouse gas (GHG), originate from soils at a global scale, and particularly
after N fertilisation of the main crops in Europe. Thanks to their capacity
to fix atmospheric N2 through biological fixation, legumes can reduce N
fertilizer use, and possibly N2O emissions. Nevertheless, the
decomposition of crop organic matter during the crop cycle and residue
decomposition, and possibly the N fixation process itself, could lead to
N2O emissions. The objective of this study was to quantify N2O
emissions from a dry pea crop (Pisum sativum, harvested at maturity) and from the
subsequent crops in comparison with N2O emissions from wheat and
oilseed rape crops, fertilized or not, in various rotations. A field
experiment was conducted over 4 consecutive years to compare the emissions
during the pea crop, in comparison with those during the wheat (fertilized
or not) or oilseed rape crops, and after the pea crop, in comparison with
other preceding crops. N2O fluxes were measured using static chambers.
In spite of low N2O fluxes, mainly due to the site's soil
characteristics, fluxes during the crop were significantly lower for pea and
unfertilized wheat than for fertilized wheat and oilseed rape. The effect of
the preceding crop was not significant, while soil mineral N at harvest was
higher after the pea crop. These results should be confirmed over a wider range of soil types.
Nevertheless, they demonstrate the absence of N2O emissions linked to
the symbiotic N fixation process, and allow us to estimate the decrease in
N2O emissions by 20–25% through including one pea crop in a three-year
rotation. On a larger scale, this reduction of GHG emissions at field level
has to be added to the decrease due to the reduced production and transport of the N
fertilizer not applied to the pea crop. |
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