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| Titel |
Nitrogen dynamics in the shallow groundwater of a riparian wetland zone of the Garonne, SW France: nitrate inputs, bacterial densities, organic matter supply and denitrification measurements |
| VerfasserIn |
J. M. Sánchez-Pérez, P. Vervier, F. Garabétian, S. Sauvage, M. Loubet, J. L. Rols, T. Bariac, P. Weng |
| 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 ; 7, no. 1 ; Nr. 7, no. 1, S.97-107 |
| Datensatznummer |
250004424
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| Publikation (Nr.) |
 copernicus.org/hess-7-97-2003.pdf |
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| Zusammenfassung |
| This study highlights the role of interactions between surface and sub-surface
water of the riparian zone of a large river (the Garonne, SW France). Information is given
about the role of surface water in supplying Dissolved Organic Carbon (DOC ) to the riparian
zone for nitrate removal processes. The densities of bacteria (up to 3.3 106
cell m L-1) in groundwater are strongly conditioned by the water moving during
flood events. Total bacterial densities in groundwater were related to surface water
bacterial densities. In sediment, total bacteria are attached mainly to fine particles
(90% in the fraction < 1 mm). Spatial variations in organic carbon and nitrate content
in groundwater at the site studied are correlated with exchanges between the groundwater
and the river, from the upstream to the downstream part of the meander. Total bacterial
densities, nitrate and decressing organic carbon concentrations follow the same pattern.
These results suggest that, in this kind of riparian wetland, nitrate from alluvial
groundwater influenced by agricultural practices may be denitrified by bacteria in the
presence of organic carbon from river surface water.
Keywords: riparian zone, nitrate removal, spatial variations, alluvial groundwater |
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