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| Titel |
Modelling the contribution of short-range atmospheric and hydrological transfers to nitrogen fluxes, budgets and indirect emissions in rural landscapes |
| VerfasserIn |
J.-L. Drouet, S. Duretz, P. Durand, P. Cellier |
| 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. 5 ; Nr. 9, no. 5 (2012-05-08), S.1647-1660 |
| Datensatznummer |
250007021
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| Publikation (Nr.) |
 copernicus.org/bg-9-1647-2012.pdf |
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| Zusammenfassung |
| Spatial interactions within a landscape may lead to large inputs of reactive
nitrogen (Nr) transferred from cultivated areas and farms to
oligotrophic ecosystems and induce environmental threats such as
acidification, nitric pollution or eutrophication of protected areas. The
paper presents a new methodology to estimate Nr fluxes at the landscape
scale by taking into account spatial interactions between landscape
elements. This methodology includes estimates of indirect Nr emissions
due to short-range atmospheric and hydrological transfers. We used the
NitroScape model which integrates processes of Nr transformation and
short-range transfer in a dynamic and spatially distributed way to simulate
Nr fluxes and budgets at the landscape scale. Four configurations of
NitroScape were implemented by taking into account or not the atmospheric,
hydrological or both pathways of Nr transfer. We simulated Nr
fluxes, especially direct and indirect Nr emissions, within a test
landscape including pig farms, croplands and unmanaged ecosystems.
Simulation results showed the ability of NitroScape to simulate patterns of
Nr emissions and recapture for each landscape element and the whole
landscape. NitroScape made it possible to quantify the contribution of both
atmospheric and hydrological transfers to Nr fluxes, budgets and
indirect Nr emissions. For instance, indirect N2O emissions were
estimated at around 21% of the total N2O emissions. They varied
within the landscape according to land use, meteorological and soil
conditions as well as topography. This first attempt proved that the
NitroScape model is a useful tool to estimate the effect of spatial
interactions on Nr fluxes and budgets as well as indirect Nr
emissions within landscapes. Our approach needs to be further tested by
applying NitroScape to several spatial arrangements of agro-ecosystems
within the landscape and to real and larger landscapes. |
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