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| Titel |
Nitrous oxide emission budgets and land-use-driven hotspots for organic soils in Europe |
| VerfasserIn |
T. Leppelt, R. Dechow, S. Gebbert, A. Freibauer, A. Lohila, J. Augustin, M. Drösler, S. Fiedler, S. Glatzel, H. Höper, J. Järveoja, P. E. Lærke, M. Maljanen, Ü. Mander, P. Mäkiranta, K. Minkkinen, P. Ojanen, K. Regina, M. Strömgren |
| 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 ; 11, no. 23 ; Nr. 11, no. 23 (2014-12-01), S.6595-6612 |
| Datensatznummer |
250117704
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| Publikation (Nr.) |
 copernicus.org/bg-11-6595-2014.pdf |
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| Zusammenfassung |
| Organic soils are a main source of direct emissions of nitrous oxide
(N2O), an important greenhouse gas (GHG). Observed N2O emissions from
organic soils are highly variable in space and time, which causes high
uncertainties in national emission inventories. Those uncertainties could be
reduced when relating the upscaling process to a priori-identified key
drivers by using available N2O observations from plot scale in empirical
approaches. We used the empirical fuzzy modelling approach MODE to identify
main drivers for N2O and utilize them to predict the spatial emission
pattern of European organic soils. We conducted a meta-study with a total
amount of 659 annual N2O measurements, which was used to derive separate
models for different land use types. We applied our models to available,
spatially explicit input driver maps to upscale N2O emissions at European
level and compared the inventory with recently published IPCC emission
factors. The final statistical models explained up to 60% of the N2O
variance. Our study results showed that cropland and grasslands emitted the
highest N2O fluxes 0.98 ± 1.08 and
0.58 ± 1.03 g N2O-N m−2 a−1, respectively. High fluxes
from cropland sites were mainly controlled by low soil pH value and
deep-drained groundwater tables. Grassland hotspot emissions were strongly
related to high amount of N-fertilizer inputs and warmer winter temperatures.
In contrast, N2O fluxes from natural peatlands were predominantly low
(0.07 ± 0.27 g N2O-N m−2 a−1) and we found no
relationship with the tested drivers. The total inventory for direct N2O
emissions from organic soils in Europe amount up to
149.5 Gg N2O-N a−1, which also included fluxes from forest and
peat extraction sites and exceeds the inventory calculated by IPCC emission
factors of 87.4 Gg N2O-N a−1. N2O emissions from organic soils
represent up to 13% of total European N2O emissions reported in the
European Union (EU) greenhouse gas inventory of 2011 from only 7% of the
EU area. Thereby the model demonstrated that the major part (85%) of the
inventory is induced by anthropogenic management, which
shows the significant reduction potential by rewetting and extensification of
agriculturally used peat soils. |
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