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Trend analyses of the key parameters involved in acidification processes measured in 20 Alpine lakes during the period 1980–2004 revealed significant decreasing sulphate (15 out of 20) and increasing alkalinity trends (14 out of 20) in most studied lakes, while trends for base cations and nitrate were small and mostly insignificant. The average increase in alkalinity between 1980 and 2004 was 0.012...