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. Geogenic organic carbon (GOC) from sedimentary rocks is an overlookedfraction in soils that has not yet been quantified but influences thecomposition, age, and stability of total organic carbon (OC) in soils. Inthis context, GOC is the OC in bedrock deposited during sedimentation. Thecontribution of GOC to total soil OC may vary, depending on the type ofbedrock. However, no studies have been carried out to investigate thecontribution of GOC derived from different terrestrial sedimentary rocks tosoil OC contents. In order to fill this knowledge gap, 10 m long sediment cores from threesites recovered from Pleistocene loess, Miocene sand, and Triassic RedSandstone were analysed at 1 m depth intervals, and the amount of GOC wascalculated based on 14C measurements. The 14C ages of bulksedimentary OC revealed that OC is comprised of both biogenic and geogeniccomponents. The biogenic component relates to OC that entered the sedimentsfrom plant sources since soil development started. Assuming an average agefor this biogenic component ranging from 1000–4000 years BP (before present), we calculatedaverage amounts of GOC in the sediments starting at 1.5 m depth, based onmeasured 14C ages. The median amount of GOC in the sediments was thentaken, and its proportion of soil mass (g GOC per kg−1 fine soil) wascalculated in the soil profile. All the sediments contained considerableamounts of GOC (median amounts of 0.10 g kg−1 in Miocene sand, 0.27 g kg−1 in Pleistocene loess, and 0.17 g kg−1 in Red Sandstone) compared with subsoil OC contents (between 0.53 and 15.21 g kg−1). Long-term incubation experiments revealed that the GOC appeared comparatively stable against biodegradation. Its possible contribution to subsoil OC stocks (0.3–1.5 m depth) ranged from 1 % to 26 % in soil developed in the Miocene sand, from 16 % to 21 % in the loess soil, and from 6 % to 36 % at the Red Sandstone site. Thus, GOC with no detectable 14C content influenced the 14C ages of subsoil OC and may partly explain the strong increase in 14C ages observed in many subsoils. This could be particularly important in young soils on terrestrial sediments with comparatively low amounts of OC, where GOC can make a large contribution to total OC stocks.

Geogenic organic carbon in terrestrial sediments and its contribution to total soil carbon