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Fig. S1 Discrimination (D) vs respiration (R20), showing lack of correlation between the two variables.

Fig. S2 Effects of fertilization, light and temperature modification on Alaskan tundra plant communities after 10 and 20 yr.

Fig. S3 Relative cover of treatment plots in 2007.

Fig. S4  R vs N by species and treatment.

Fig. S5 Inhibition titration curves for Betula, Eriophorum and Rubus leaves.

Table S1 Respiratory endpoint measurements in Betula nana, Eriophorum vaginatum and Rubus chamaemorus

Table S2 Small-sample-size corrected Akaike information criterion (AICc) comparison of all valid combinations of species (S), nutrient addition (N), and Environment (E) effects