Whereas for the vast majority of natural and agricultural
soils observed SOC for subsoil was 2–4 times lower than in the
upper horizons, subsoil SOC within settlements was often comparable
with, and in a few cases even exceeded, topsoil SOC. Considering significant
difference in thickness of the layers (10 cm for topsoil observed
and from30 cmto severalmeters for the “cultural layer”), this outcome
definitely illustrates the necessity to consider the SOC profile distribution