gcb2794-sup-0001-FigureS1-S2.docxWord document561KFigure S1. Annual mean DOC concentrations at long-term monitoring sites in the UK Acid Waters Monitoring Network located close to the experimental sites. The River Etherow is located within 5 km of the Peak District experimental sites, and has a catchment dominated by blanket peat, with peaty podzols on steeper hillslopes. Llyn Llagi (a lake) is located 13 km west of the Migneint experiments, whereas the Afon Gwy (a river) is located approximately 50 km south. Both Welsh catchments are dominated by organo-mineral soils, with smaller areas of blanket peat. Trend lines shown are linear regression fits to annual mean data. Figure S2. Ratio of treatment to control standardized DOC (RDOCstd) vs. ratio of treatment to control standardized hydrogen ion concentration (RHstd) for all samples collected in 2009–2011 merged by region (a, b) and soil type (c, d). Filled circles represent samples from acid treatment plots, open circles samples from alkaline treatment plots (mean of four replicates in each case). Trend lines shown are of the form RDOCstd = 1/(RHstdb), with b fitted to each dataset by weighted least squares regression (see Methods, Table 2). Solid trend lines show fit to full dataset, dashed trend lines show fit to data after excluding data from the Migneint podzol alkaline treatment.

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