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Figure S1. Seasonal fluxes of CH4 (a) and N2O (b) during the growing season in 2007–2011 in response to elevated CO2 and warming. Negative values indicate fluxes from the atmosphere to the soil. Treatments: ct: ambient CO2 and ambient temperature; cT: ambient CO2 and elevated temperature; Ct: elevated CO2 and ambient temperature; CT: elevated CO2 and elevated temperature. Error bars indicate Tukey's HSD.

Figure S2. Seasonal water filled pore space (WFPS) (a), soil temperature (b), and plot greenness (c) during the growing season in 2007–2011 in response to elevated CO2 and warming. Treatments: ct: ambient CO2 and ambient temperature; cT: ambient CO2 and elevated temperature; Ct: elevated CO2 and ambient temperature; CT: elevated CO2 and elevated temperature. Error bars indicate Tukey's HSD.

Figure S3. Fluxes of CH4 (a, c, e) and N2O (b, d, f) as a function of water filled pore space (WFPS, a, b), soil temperature (c, d) and plot greenness (e, f). Each data point is the average CH4 or N2O flux, and average WFPS, soil temperature, or plot greenness measured across all five replicates for each treatment at a specific date between 2007 and 2011. Treatments: ct: ambient CO2 and ambient temperature; cT: ambient CO2 and elevated temperature; Ct: elevated CO2 and ambient temperature; CT: elevated CO2 and elevated temperature. Regression lines are only shown when significant (< 0.05, Table S1).

Table S1. Results from ancovas with water filled pore space (WFPS), soil temperature (Temp), and plot greenness (Greenness) as covariates, and as independent variables in regression analyses to predict CH4 and N2O fluxes for each treatment (ct: ambient CO2 and ambient temperature; cT: ambient CO2 and elevated temperature; Ct: elevated CO2 and ambient temperature; CT: elevated CO2 and elevated temperature).

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