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| Titel |
Spatial variability and hotspots of soil N2O fluxes from intensively grazed grassland |
| VerfasserIn |
N. J. Cowan, P. Norman, D. Famulari, P. E. Levy, D. S. Reay, U. M. Skiba |
| 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 ; 12, no. 5 ; Nr. 12, no. 5 (2015-03-12), S.1585-1596 |
| Datensatznummer |
250117854
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| Publikation (Nr.) |
 copernicus.org/bg-12-1585-2015.pdf |
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| Zusammenfassung |
| One hundred N2O flux measurements were made from an area of intensively
managed grazed grassland in central Scotland using a high-resolution dynamic
chamber method. The field contained a variety of features from which
N2O fluxes were measured including a manure heap, patches of decaying
grass silage, and areas of increased sheep activity. Individual fluxes
varied significantly across the field varying from 2 to 79 000 μg N2O-N m−2 h−1. Soil samples were collected at
55 locations to investigate relationships between soil properties and N2O
flux. Fluxes of N2O correlated strongly with soil NO3-
concentrations. Distribution of NO3− and the high spatial
variability of N2O flux across the field are shown to be linked to the
distribution of waste from grazing animals and the resultant reactive
nitrogen compounds in the soil which are made available for microbiological
processes. Features within the field such as shaded areas and manure heaps
contained significantly higher available nitrogen than the rest of the
field. Although these features only represented 1.1% of the area of the
field, they contributed to over 55% of the total estimated daily
N2O flux. |
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