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Le bassin versant du Strengbach à Aubure (Haut-Rhin France) pour l'étude du dépérissement forestier dans les Vosges (programme DEFORPA). II - Influence des précipitations acides sur la chimie des eaux de surface

Probst, Anne and Fritz, Bertrand and Ambroise, B. and Viville, Daniel Le bassin versant du Strengbach à Aubure (Haut-Rhin France) pour l'étude du dépérissement forestier dans les Vosges (programme DEFORPA). II - Influence des précipitations acides sur la chimie des eaux de surface. (1987) In: Air pollution and ecosystems , 18-22 May 1987, Grenoble, France .

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Abstract

The Strengbach basin (Haut-Rhin, Vosges massif) has been chosen to study hydrochemical balances in surface waters in relation with forest decline (DEFORPA Program). The caracteristics and the equipment of the basin are described in part 1. The first results concern rain,spring and river waters . The acidity of rain waters (mean pH-4 . 5) is already neutralized in spring and stream waters but the strong acid anions always dominate the anionic charge of surface waters: sulfate represents 60 , of the stream anionic charge, while the alkalinity remains low (44 µeq/l). The buffering capacity is then very weak and is affected during snowmelt and with the first increase in automn runoff. The high concentration of sulfate in stream water can be explained by important dry deposits of sulfur : the first analyses of chemical composition of throughfall confirm this hypothesis. The contrary is observed in the non forested Ringelbach basin where alkalinity dominates the anionic charge of the stream waters also draining granitic bedrock.

Item Type:Conference or Workshop Item (Paper)
Additional Information:This paper is published in : Air pollution and ecosystems : proceedings of an international symposium edited by P. Mathy, ... - Dordrecht : D. Reidel, cop. 1988. - ISBN 90-277-2611-6
Audience (conference):International conference proceedings
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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

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