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gcb12342-sup-0001-FigS1.TIFimage/tif2361KFigure S1. Replicate (= 3) 13C CP-MAS NMR spectra. The vertical lines indicate the partitioning of the spectra into different groups of carbon compounds: Region 1 (0–50 ppm) is assigned to alkyl carbon; region 2 (50–60 ppm) to methoxy/N-alkyl carbon; region 3 (60–93 ppm) to O-alkyl carbon; region 4 (93–112) to Di-O-alkyl; region 5(112–140) to aromatic carbon; region 5 (140–165 ppm) to O-aromatic carbon, and region 6 (165–190 ppm) to carbonyl carbon.
gcb12342-sup-0002-FigS2.TIFimage/tif3051KFigure S2. The basal respiration rate in mg CO2 g−1 OM (dw) h−1for 10 litter samples incubated at four temperatures: (a) 4C°, (b) 9 C°, (c) 14 C°, and (d) 19 C°. Error bars represent SE.
gcb12342-sup-0003-FigS3.TIFimage/tif3015KFigure S3. The basal respiration rate in mg CO2 g−1 OM (dw) h−1for 12 samples of soil organic matter, incubated at four temperatures: (a) 4C°, (b) 9 C°, (c) 14 C°, and (d) 19 C°. Error bars represent SE.
gcb12342-sup-0004-FigS4.TIFimage/tif5399KFigure S4. Replicate (= 3) 13C CP-MAS NMR spectra on top of each other from litter.
gcb12342-sup-0005-FigS5.TIFimage/tif6675KFigure S5. Replicate (= 3) 13C CP-MAS NMR spectra on top of each other from the soil (site I.D.). The star (*) indicates dominant tree species.
gcb12342-sup-0006-FigS6.TIFimage/tif2229KFigure S6. CP-MAS NMR spectra of litter with highly different Q10 responses, Wavy hair grass (Deshampsia flexuosa) and Spruce and Pine needles, respectively. The different Q10 responses are given in the graph.
gcb12342-sup-0007-FigS7a.tifimage/tif81KFigure S7. Contour plots illustrating the Q10 of saprotrophic CO2 production from soil organic matter samples in response to the significant two-way interactions of the explanatory variables: (a) O-alkyl*Di-O-alkyl and (b) O-alkyl*Carbonyl. The graph (7a) clearly reveals that the effect of the proportion of di-O-alkyl on the temperature sensitivity depends on the amount of O-alkyl. At lower concentrations of O-alkyl the Q10-response decreases from ca. 3.2 to 2.8 with increasing di-O-alky while at higher O-alkyl content the response is opposite. The effect of the carbonyl content on the Q10 response of saprotrophic CO2 production is highly dependent on the O-alkyl content. At lower contents of O-alkyl (34–36%), the Q10 response increases with increasing content of carbonyl carbon. At O-alkyl contents above ca. 38%, there is not much effect of the carbonyl content on the Q10 response of saprotrophic.
gcb12342-sup-0008-FigS7b.tifimage/tif76K 
gcb12342-sup-0009-TableS1.docxWord document80KTable S1. Summary site descriptions including location, vegetation cover, and litter type.

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