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Fig. S1 Bulk root δ13C from fine roots 1–2 mm diameter from in-growth cores.

Fig. S2 A linearity approach to separating C pools with different turnover rates: log (% treatment C remaining) as a function of time after CO2 fumigation cessation.

Fig. S3 A comparison of one-pool and two-pool exponential decay functions for fine roots < 1 mm diameter.

Fig. S4 A comparison of one-pool and two-pool exponential decay functions for fine roots 1–2 mm diameter.

Table S1 ANOVA results for bulk δ13C of fine roots < 1 mm diameter from in-growth cores with sampling period as replicate

Table S2 ANOVA results for comparing bulk root δ13C and fine-root respired CO2 in ambient [CO2] with sampling time and C source as replicates

Table S3 ANOVA results for comparing δ13C of fine-root respired CO2 in the elevated [CO2] rings with sampling time as replicate