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Geochemistry of SOM in the 2 active layer (14 ± 2 and 24 ± 2 cm) and 5 permafrost soil horizons (33.5 ± 2 to 126 ± 2 cm) of core TL08S1C3. (A) Bulk geochemical and stable isotope data and total concentrations of FAs and alkanes. (B) Percent contributions and ratios from lipid sub-classes representing different biological sources.
