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| Titel |
Nitrogen retention in natural Mediterranean wetland-streams affected by agricultural runoff |
| VerfasserIn |
V. García-García, R. Gómez, M. R. Vidal-Abarca, M. L. Suárez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 13, no. 12 ; Nr. 13, no. 12 (2009-12-10), S.2359-2371 |
| Datensatznummer |
250012070
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| Publikation (Nr.) |
 copernicus.org/hess-13-2359-2009.pdf |
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| Zusammenfassung |
| Nitrogen retention efficiency in natural Mediterranean wetland-streams
affected by agricultural runoff was quantified and the effect of the
temporal variability and hydrological/chemical loading was examined from
March 2007 to June 2008 in two wetland-streams located in Southeast Spain.
Nitrate-N (NO−3-N), ammonium-N (NH+4-N), total
nitrogen-N (TN-N), total organic nitrogen-N (TON-N) and chloride (Cl−)
concentrations were analyzed to calculate nitrogen retention efficiencies.
These wetland-streams consistently reduced water nitrogen concentration
throughout the year with higher values for NO−3-N (72.3%), even
though the mean value of inflow NO−3-N concentrations was above
20 mg l−1. Additionally, they usually acted as sinks for TON-N (8.4%),
but as sources for NH+4-N. Over the entire study period, the Taray
and Parra wetland-streams were capable of removing on average 1.6 and 0.8 kg
NO−3-N a day−1, respectively. Retention efficiencies were not
affected by temperature variation. NO−3-N retention efficiency
followed a seasonal pattern with the highest retention values in summer
(June–September). The temporal variability for NO−3-N retention
efficiency was positively and negatively explained by the hydrologic
retention and the inflow NO−3-N concentration
(R2adj=0.815, p<0.01), respectively. No significant regression
model was found for TON-N and NH+4-N. Finally, the conservation of
these Mediterranean wetland-streams may help to not only improve the surface
water quality in agricultural catchments, but to also achieve good
ecological status for surface waters, this being the Water Framework
Directive's ultimate purpose. |
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