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Titel |
The significance of nitrous oxide emission due to cropping of grain for biofuel production: a Swedish perspective |
VerfasserIn |
Åsa Kasimir Klemedtsson, K. A. Smith |
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 ; 8, no. 12 ; Nr. 8, no. 12 (2011-12-08), S.3581-3591 |
Datensatznummer |
250006242
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Publikation (Nr.) |
copernicus.org/bg-8-3581-2011.pdf |
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Zusammenfassung |
The current regulations governing production of biofuels in the European
Union require that they have to mitigate climate change, by producing
>35% less greenhouse gases (GHG) than fossil fuels. There is a risk
that this may not be achievable, since land use for crop production
inevitably emits the potent GHG nitrous oxide (N2O), due to nitrogen
fertilisation and cycling in the environment. We analyse first-generation
biofuel production on agricultural land and conclude that efficient
agricultural crop production resulting in a good harvest and low N2O
emission can fulfil the EU standard, and is possible under certain
conditions for the Swedish agricultural and bioethanol production systems.
However, in years having low crop yields, and where cropping is on organic
soils, total GHG emissions per unit of fuel produced can be even higher than
those released by burning of fossil fuels. In general, the N2O emission
size in Sweden and elsewhere in northern Europe is such that there is a
>50% chance that the 35% saving requirement will not be met. Thus
ecosystem N2O emissions have to be convincingly assessed. Here we
compare Swedish emission data with values estimated by means of statistical
models and by a global, top-down, approach; the measurements and the
predictions often show higher values that would fail to meet the EU standard
and thus prevent biofuel production development. |
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