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Significance of N2O emission from biofuel crops

Artikel i övriga tidskrifter
Författare Åsa Kasimir Klemedtsson
Publicerad i Biogeosciences discussions
Volym 8
Sidor 6743-3774
ISSN 1810-6285
Publiceringsår 2011
Publicerad vid Institutionen för geovetenskaper
Sidor 6743-3774
Språk en
Länkar www.biogeosciences-discuss.net/8/67...
Ämneskategorier Geovetenskap och miljövetenskap, Biologiska vetenskaper, Växtproduktion

Sammanfattning

The current regulations governing biofuel production 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 5 use for crop production inevitably emits the strong GHG nitrous oxide (N2O), due to nitrogen fertilisation and cycling in the environment. We conclude that efficient agricultural crop production resulting in a good harvest and low N2O emission can fulfill the EU standard, and is possible under certain conditions for the Swedish agricultural and refinery production systems. However, in years having low crop yields total GHG 10 emissions can be even higher than those released by burning of fossil fuels. In general, the N2O emission size in Sweden and 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, procedure; 15 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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