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Natural Alkalinity Generation in Neutral Lakes Affected by Acid Mine Drainage

Helmholtz Centre for Environmental Research-UFZ, Dep. of Lake Research, Brückstr. 3a, D-39114 Magdeburg, Germany

View larger version (29K): [in this window] [in a new window]   Figure S1. Frequency distribution of alkalinity generating processes in the dataset used for the present study. (A) log2 nitrogen burial, (B) log2 denitrification, (C) log10 net sulfate reduction and (D) log10 potential net sulfate reduction when methanogenesis is inhibited (PSR). Process rates were converted to alkalinity generation according to Eq. [2]. Labels of x axes denote class minima.

View larger version (18K): [in this window] [in a new window]   Fig. 1. Gross (squares) and net (dots) sulfate reduction rates plotted against sulfate concentrations in different lakes. Data from Tables S2 and S3 (in online supplemental information). Slopes of regressions (not shown) were not significant (p = 0.50, t = 0.68 and p = 0.32, t = 1.03 for net and gross rates, respectively).