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gcb2663-sup-0001-FigS1.docxWord document334KTable S1. Mean bulk density values (dry soil mass per volume) per peatland for both current rooting zone soil (active layer, AL) and near-surface permafrost soil (PF).
gcb2663-sup-0002-FigS2.docxWord document334KTable S2. Averages and F- statistics for repeated-measures anovas for the effects of depth and sampling location on potential enzyme activities for four aminopeptidases in peat soils (see text for abbreviations) incubated at 4 °C (nmol g-1DW h-1). Sampling location (peatland A-E) was taken as between-subject factor and depth (active layer, permafrost) as within-subject factor. Alanine data were log-transformed before analysis.
gcb2663-sup-0003-TableS1.docxWord document334KFigure S1. As a positive control of Poa alpina phytometer N-limitation, three N additions of 0.75 g N m−2 (N-low), 1.5 g N m−2 (N-med) and 3.0 g N m−2 (N-high) were applied. Fertilizer was given to the soil surface (79 cm2) as NH4NO3 solution divided over 6 weekly 10 ml gifts. Controls, soil and litter treatments received 10 ml de-ionized water simultaneously to prevent moisture-related artefacts. Data are means ±SE, = 13, all treatments differed significantly from each other (P < 0.001).
gcb2663-sup-0004-TableS2.docxWord document333KFigure S2. Phytometers grown on sand mixed with near-surface permafrost soil, current rooting zone (active layer) soil or litter, immediately after their harvest, showing remarkable differences in size. For an elaborate description of the historical use, pros and cons of the bioassay technique see Axmanova et al. (2011, Plant and Soil, 342, 183-194).

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