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| Titel |
Investigating uptake of N2O in agricultural soils using a high-precision dynamic chamber method |
| VerfasserIn |
N. J. Cowan, D. Famulari, P. E. Levy, M. Anderson, D. S. Reay, U. M. Skiba |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-17), S.4455-4462 |
| Datensatznummer |
250115996
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| Publikation (Nr.) |
 copernicus.org/amt-7-4455-2014.pdf |
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| Zusammenfassung |
| Uptake (or negative flux) of nitrous oxide (N2O) in agricultural soils
is a controversial issue which has proved difficult to investigate in the
past due to constraints such as instrumental precision and methodological uncertainties. Using a recently developed high-precision
quantum cascade laser gas analyser combined with a closed dynamic
chamber, a well-defined detection limit of 4 μg N2O-N m−2 h−1 could be achieved for individual soil flux measurements. 1220
measurements of N2O flux were made from a variety of UK soils using
this method, of which 115 indicated uptake by the soil (i.e. a negative flux
in the micrometeorological sign convention). Only four of these apparently
negative fluxes were greater than the detection limit of the method, which
suggests that the vast majority of reported negative fluxes from such
measurements are actually due to instrument noise. As such, we suggest that
the bulk of negative N2O fluxes reported for agricultural fields are
most likely due to limits in detection of a particular flux measurement
methodology and not a result of microbiological activity consuming
atmospheric N2O. |
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