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| Titel |
Comparison of soil greenhouse gas fluxes from extensive and intensive grazing in a temperate maritime climate |
| VerfasserIn |
U. Skiba, S. K. Jones, J. Drewer, C. Helfter, M. Anderson, K. Dinsmore, R. McKenzie, E. Nemitz, M. A. Sutton |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-26), S.1231-1241 |
| Datensatznummer |
250018119
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| Publikation (Nr.) |
 copernicus.org/bg-10-1231-2013.pdf |
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| Zusammenfassung |
| Greenhouse gas (GHG) fluxes from a seminatural, extensively sheep-grazed
drained moorland and intensively sheep-grazed fertilised grassland in
South East (SE) Scotland were compared over 4 yr (2007–2010). Nitrous
oxide (N2O) and methane (CH4) fluxes were measured by static
chambers, respiration from soil plus ground vegetation by a flow-through
chamber, and the net ecosystem exchange (NEE) of carbon dioxide (CO2)
by eddy-covariance. All GHG fluxes displayed high temporal and interannual
variability. Temperature, radiation, water table height and precipitation
could explain a significant percentage of seasonal and interannual
variations. Greenhouse gas fluxes were dominated by the net ecosystem
exchange of CO2 at both sites. Net ecosystem exchange of CO2 and
respiration was much larger on the productive fertilised grassland (−1567
and 7157 g CO2eq m−2 yr−1, respectively) than on the seminatural
moorland (−267 and 2554 g CO2eq m−2 yr−1, respectively). Large
ruminant CH4 (147 g CO2eq m−2 yr−1) and soil N2O
(384 g CO2eq m−2 yr−1) losses from the grazed grassland
counteracted the CO2 uptake by 34%, whereas the small N2O (0.8 g CO2eq m−2 yr−1) and CH4
(7 g CO2eq m−2 yr−1) emissions from the moorland only impacted the NEE flux by
3%. The 4-yr average GHG budget for the grazed grassland was −1034 g CO2eq m−2 yr−1 and −260 g CO2eq m−2 yr−1 for
the moorland. |
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