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| Titel |
Tracing changes of N2O emission pathways in a permanent grassland under elevated atmospheric CO2 concentrations |
| VerfasserIn |
Andre Gorenflo, Gerald Moser, Kristof Brenzinger, Dafydd Elias, Neill McNamara, Tim Clough, Irena Maček, Dominik Vodnik, Gesche Braker, Sonja Schimmelpfennig, Judith Gerstner, Christoph Müller |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114930
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| Publikation (Nr.) |
 EGU/EGU2015-15765.pdf |
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| Zusammenfassung |
| The increase of greenhouse gases (GHG) in the atmosphere is of concern due to its effect on
global temperatures. Nitrous oxide (N2O) with a Global Warming Potential of 298 over a 100
year period is of particular concern because strong feedback effects of elevated atmospheric
CO2 on N2O emissions have been observed. However, so far the changes in processes
which are responsible for such a feedback effect are only poorly understood. Our
study was carried out in situ in a long-term Free Air Carbon dioxide Enrichment
(FACE) study on permanent grassland at atmospheric CO2 concentrations 20% above
ambient which expected at the middle of this century. We performed an in situ
15N tracing with differentially labelled NH4NO3 to trace the main N2O emission
pathways. Over a period of more than one year we monitored at least weakly the N2O
emissions with the closed chamber technique and analyzed the 15N signature of the
N2O. The observed gaseous emissions under ambient and elevated atmospheric
CO2 were associated with the observed gross N transformations and the microbial
activities to identify the main emission pathways under ambient and elevated CO2. |
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