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| Titel |
Estimation of nitrogen budgets for contrasting catchments at the landscape scale |
| VerfasserIn |
E. Vogt, C. F. Braban, U. Dragosits, M. R. Theobald, M. F. Billett, A. J. Dore, Y. S. Tang, N. Dijk, R. M. Rees, C. McDonald, S. Murray, U. M. Skiba, 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. 1 ; Nr. 10, no. 1 (2013-01-09), S.119-133 |
| Datensatznummer |
250017462
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| Publikation (Nr.) |
 copernicus.org/bg-10-119-2013.pdf |
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| Zusammenfassung |
| A comprehensive assessment of nitrogen (N) flows at the landscape scale is
fundamental to understand spatial interactions in the N cascade and to
inform the development of locally optimised N management strategies. To
explore these interactions, complete N budgets were estimated for two
contrasting hydrological catchments (dominated by agricultural grassland vs.
semi-natural peat-dominated moorland), forming part of an intensively
studied landscape in southern Scotland. Local scale atmospheric dispersion
modelling and detailed farm and field inventories provided high resolution
estimations of input fluxes. Direct agricultural inputs (i.e. grazing
excreta, N2 fixation, organic and synthetic fertiliser) accounted for
most of the catchment N inputs, representing 82% in the grassland and
62% in the moorland catchment, while atmospheric deposition made a
significant contribution, particularly in the moorland catchment,
contributing 38% of the N inputs. The estimated catchment N budgets
highlighted areas of key uncertainty, particularly N2 exchange and stream N export. The resulting N balances suggest that
the study catchments have a limited capacity to store N within soils,
vegetation and groundwater. The "catchment N retention", i.e. the amount of
N which is either stored within the catchment or lost through atmospheric
emissions, was estimated to be 13% of the net anthropogenic input in the
moorland and 61% in the grassland catchment. These values contrast with
regional scale estimates: Catchment retentions of net anthropogenic input
estimated within Europe at the regional scale range from 50% to 90%,
with an average of 82% (Billen et al.,
2011). This study emphasises the need for detailed budget analyses to
identify the N status of European landscapes. |
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