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Nitrogen and phosphorus exportation in the Garonne Basin (France)

Probst, Jean-Luc Nitrogen and phosphorus exportation in the Garonne Basin (France). (1985) Journal of Hydrology, vol. 76 (n° 3-4). p. 281-305.

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Official URL: http://dx.doi.org/10.1016/0022-1694(85)90138-6

Abstract

Nitrogen balance was determined in two basins of the southwest of France: the Garonne (52,000 km²) and one of its tributaries, the Girou (520 km²). Phosphorus balance was estimated only in the Girou watershed. Monthly water samples were collected during the period 1971 to 1981. The nitrogen balance showed that there was a good relationship between the exportation rate (ratio between river exportations and fertilizer inputs) and the mean annual discharge in the two watersheds. During a humid hydrological year, the exportation rate reached 40-50%. Phosphorus balance in the Girou watershed showed that the exportation rate is lower than 1%. The contribution of the different phosphorus sources to the annual streamflux was estimated as 7% for biogeochemical processes, 32% for non-point-pollution due to fertilizer application and 61% for point-pollution due to sewage effluent.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Hydrology website : http://www.elsevier.com/wps/find/journaldescription.cws_home/503343/description#description
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
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Deposited By: Florence Amor
Deposited On:03 Nov 2010 08:26

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