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| Titel |
Spatial and temporal variability of nitrous oxide emissions in a mixed farming landscape of Denmark |
| VerfasserIn |
K. Schelde, P. Cellier, T. Bertolini, T. Dalgaard, T. Weidinger, M. R. Theobald, J. E. Olesen |
| 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. 8 ; Nr. 9, no. 8 (2012-08-07), S.2989-3002 |
| Datensatznummer |
250007231
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| Publikation (Nr.) |
 copernicus.org/bg-9-2989-2012.pdf |
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| Zusammenfassung |
| Nitrous oxide (N2O) emissions from agricultural land are variable at
the landscape scale due to variability in land use, management, soil type,
and topography. A field experiment was carried out in a typical mixed
farming landscape in Denmark, to investigate the main drivers of variations
in N2O emissions, measured using static chambers. Measurements were
made over a period of 20 months, and sampling was intensified during two
weeks in spring 2009 when chambers were installed at ten locations or fields
to cover different crops and topography and slurry was applied to three of
the fields. N2O emissions during spring 2009 were relatively low, with
maximum values below 20 ng N m−2 s−1. This applied to all land use
types including winter grain crops, grasslands, meadows, and wetlands. Slurry
application to wheat fields resulted in short-lived two-fold increases in
emissions. The moderate N2O fluxes and their moderate response to
slurry application were attributed to dry soil conditions due to the absence
of rain during the four previous weeks. Cumulative annual emissions from two
arable fields that were both fertilized with mineral fertilizer and manure
were large (17 kg N2O-N ha−1 yr−1 and 5.5 kg N2O-N ha−1 yr−1)
during the previous year when soil water conditions were
favourable for N2O production during the first month following
fertilizer application. Our findings confirm the importance of weather
conditions as well as nitrogen management on N2O fluxes. |
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