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| Titel |
Theoretical and practical limitations of the acetylene inhibition technique to determine total denitrification losses |
| VerfasserIn |
R. Felber, F. Conen, C. R. Flechard, A. Neftel |
| 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 ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-26), S.4125-4138 |
| Datensatznummer |
250007343
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| Publikation (Nr.) |
 copernicus.org/bg-9-4125-2012.pdf |
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| Zusammenfassung |
| The loss of N2 from intensively managed agro-ecosystems is an important
part of the N budget. Flux monitoring of N2 emissions at the field scale,
e.g., by eddy correlation or aerodynamic gradient method, is impossible due to
the large atmospheric N2 background (78%). The acetylene (C2H2)
inhibition technique (AIT) is a rather simple and frequently used, albeit
imperfect, method to determine N2 losses from intact soil cores. In
principle, AIT allows an estimation of total denitrification at high temporal
resolution and on small spatial scales, with limited workload and costs
involved. To investigate its potential and limitations, a laboratory system
with two different detection systems (photoacoustic IR spectroscopy and gas
chromatography) is presented, which allowed simultaneous measurements of up
to 7 intact soil cores in air-tight glass tubes in a temperature controlled
cabinet (adjusted to field conditions) with automated C2H2 injection.
A survey of total denitrification losses (N2 + N2O) over 1.5 yr in
soil cores from an intensively managed, cut grassland system in central
Switzerland supports previous reports on severe limitations of the AIT, which
precluded reliable estimates of total denitrification losses. Further, the
unavoidable sampling and transfer of soil samples to the laboratory causes
unpredictable deviations from the denitrification activity in the field. |
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