Supplementary material to "Changes in temperature sensitivity of soil respiration with decadal warming"

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S.1 Soil properties, soil content, & vegetation biomassThe intact soil cores were initially weighed before incubation and then sieved (2 mm) to separate roots, rocks, and soil material after incubation.Each fraction was weighed, after which the roots and soil were oven-dried at 55 °C to obtain dry weights (Figure S1). 5Figure S1.Percentages of water (cyan), roots (green), soil (gold), and rocks (dark grey) per five replicates within each decadal warming level.Decadal warming levels included: ambient (+0.0, 0.0, and 0.5 °C), low (+1.5, 2.0, and 2.5 °C), mid (+7.5, 8.5, and 10.0 °C), mid-high (+15.0 and 20.0 °C), high (+25.0and 35.0 °C), and hotspot (+75.0 °C).Composition of intact soil cores is shown as percentages of water, roots, soil, and rocks across the decadal warming gradient 10 (Figure S1).Each bar represents one of five replicate cores per plot per decadal warming level: ambient (+0 °C), low (+1-3 °C), mid (+7-10 °C), mid-high (+15-20 °C), high (+25-35 °C), and hotspot (+75 °C).Root content declined under higher warming, especially at the hotspot, indicating reduced belowground plant biomass.Rock content varied most strongly among levels and between replicates, with one (+2 °C) core containing > 20% rock and < 20% soil.Methods for determining SOC concentration (%C; Figure 2A) and soil bulk density (g cm⁻³; Figure 2B) are described in section 15 2.4 of the main text.Corresponding post-hoc test results provided in Supplementary Tables 1 and 2, respectively.decadal warming (°C) Mid 6.02 -0.022 ------Mid-High 4.94 -0.335 -0.313 ----High 10.44 5.40 5.39 5.18 --Hotspot 10.64 6.26 6.25 6.06 1.39 Mid -4.49 2.79 ------Mid-High -4.84 1.54 -9.05 ----High -8.73 -2.67 -4.95 -3.73 --Hotspot -7.86 -2.59 -4.58 -3.57-0.23

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