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Abstract
Fluvial dissolved nitrogen (dissolved organic nitrogen [DON], nitrate
and ammonium) fluxes from the terrestrial biosphere of the UK to
surrounding oceans are explained on the basis of combined predictions of
soil to water transfer and in-stream loss. The flux of different
nitrogen species from land to surface waters is estimated using an
export coefficient model employing catchment soil, land use and
hydroclimatic characteristics, fitted to flux estimates derived from the
Harmonised Monitoring Scheme between 2001 and 2007 for 169 UK
catchments. In-stream losses of DON, nitrate and ammonium were estimated
using a transit time filter in the fluvial network. Comparisons of
modelled land to water N flux (2125 ktonnes N yr− 1) with estimates of N fluxes to estuarine and ocean systems at the tidal limit (791 ktonnes N yr− 1) suggest that significant in-channel N losses occur. These in transit losses are equivalent to up to 55 kg N ha− 1 yr− 1.
Original language | English |
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Pages (from-to) | 90-100 |
Number of pages | 11 |
Journal | Science of The Total Environment |
Volume | 434 |
Early online date | 16 Mar 2012 |
DOIs | |
Publication status | Published - 15 Sep 2012 |
Keywords
- Nitrogen
- In-stream losses
- Budgets
- Land-use
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