Auxiliary material for this article contains a summary of the results from <sup>14</sup>C dating. The results from the analyses of individual sites are provided in three figures.

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jgrg912-sup-0001-readme.txtplain text document7Kreadme.txt
jgrg912-sup-0002-txts01.docplain text document74KText S1. This document contains detailed information from 14C dating in Table S1 and a detailed description of the observed trends in each site.
jgrg912-sup-0003-fs01.jpgJPEG image1831KFigure S1. SOM characteristics in tundra and forest soils.
jgrg912-sup-0004-fs02.jpgJPEG image2072KFigure S2. SOM characteristics in fens.
jgrg912-sup-0005-fs03.jpgJPEG image2121KFigure S3. SOM characteristics in permafrost peat plateaus.
jgrg912-sup-0006-t01.txtplain text document2KTab-delimited Table 1.
jgrg912-sup-0007-t02.txtplain text document2KTab-delimited Table 2.
jgrg912-sup-0008-t03.txtplain text document2KTab-delimited Table 3.
jgrg912-sup-0009-t04.txtplain text document1KTab-delimited Table 4.

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