Abstract
A survey on the sensitivity of freshwater to acidification was performed in the French Ardennes Massif. For that purpose, the relationships between acidifying factors (such as atmospheric deposition), buffering factors (such as bedrock and soil type) and surface water acidity were investigated. Critical loads of acidity were calculated for 36 characteristic streams. Results show that spruces, aluminium-enriched schists and plateaus with silts seem to be the most important factors controlling surface water chemistry. Such a combination occurs in the central part of the French Ardennes, where 70 % of the investigated streams were found to be acidic. Moreover, the corresponding critical loads for these catchments are the lowest in this area (< 1.2 keq·ha −1·yr −1).
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