Tracing the sources and spatial distribution of organic carbon in subsoils using a multi-biomarker approach.

In the strongly rooted upper subsoil (10 and 35 cm depths), the contents of plant-derived n- alkanes (C 25 -C 33 ) decreased significantly (p = 0.02) between the 10 and 35 cm depths and then remained constant with a slightly increasing trend below the 35 cm depth ( Fig. 2 ).

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This index showed a decreasing trend from the 10 cm depth (6.6 ± 0.2) to the 35 cm depth (5.2 ± 0.4), but strongly increased below the 60 cm depth to a maximum value of 11.1 ± 0.2 (85 cm depth) in the deeper subsoil.

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