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Fig. S1 The effect of fertilizer addition on total, aboveground, and belowground mass, and the above to belowground mass ratio of Pinus contorta seedlings grown in unsterilized soils from Sweden and Canada.

Fig. S2 Soil pH and NH4+ concentrations at Canadian (= 4) and Swedish (= 16) sites used for two glasshouse experiments.

Fig. S3 The ratio of above to belowground biomass of Pinus contorta seedlings grown in sterilized control soils, or soil sterilized and inoculated with Canadian or Swedish soil biota, without or with fertilizer added.

Fig. S4 The effect of fertilizer addition on total, aboveground, and belowground mass, and the above to belowground mass ratio of Pinus contorta seedlings grown in sterilized soil.