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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

Sanchez-Pérez, José-Miguel and Vervier, Philippe and Garabétian, Frédéric and Sauvage, Sabine and Loubet, M. and Rols, Jean-Luc and Bariac, Thierry and Weng, P. 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. (2003) Hydrology and Earth System Sciences, vol. 7 (n° 1). pp. 97-107. ISSN 1027-5606

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Official URL: http://dx.doi.org/10.5194/hess-7-97-2003

Abstract

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 3.3106 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.

Item Type:Article
Additional Information:This publication is also available at www.hydrol-earth-syst-sci.net/7/97/2003/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National des Etudes Spatiales - CNES
French research institutions > Centre National de la Recherche Scientifique - CNRS
French research institutions > Institut National de la Recherche Agronomique - INRA
French research institutions > Institut de Recherche pour le Développement - IRD
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Bureau de recherches géologiques et minières - BRGM
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Deposited By: Florence Amor

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