2020
DOI: 10.5194/soil-2020-34
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Geogenic organic carbon in terrestrial sediments and its contribution to total soil carbon

Abstract: Abstract. Geogenic organic carbon (GOC) from sedimentary rocks is an overlooked fraction in soils that has not been quantified yet, influencing the composition, age and stability of total organic carbon (OC) in soils. In this context GOC is referred to as the OC in bedrocks deposited during sedimentation. However, the contribution of GOC to total soil OC varies with the type of bedrock. So far studies investigating the contribution of GOC derived from different terrestrial sedimentary rocks to soil OC contents… Show more

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Cited by 3 publications
(3 citation statements)
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“…The analysis was restricted to topsoils (0-30 cm) since one of the critical assumptions of this MRT OC approach is that SOC is autochthonous, that is, it has been entirely built up in situ by the estimated carbon inputs. This is not always correct for topsoils, but is even more problematic for subsoils, which often contain allochthonous, translocated, relictic or geogenic OC (Kalks et al, 2020;Schneider et al, 2020). As mentioned above, SOC in soils with a C:N ratio >13, which have been classified as 'black sands' (Poeplau et al, 2020;Vos et al, 2018), were excluded since they constitute an extreme example of relictic SOC.…”
Section: Calculation Of the Mean Residence Time Of Organic Carbon Entering The Soilmentioning
confidence: 99%
“…The analysis was restricted to topsoils (0-30 cm) since one of the critical assumptions of this MRT OC approach is that SOC is autochthonous, that is, it has been entirely built up in situ by the estimated carbon inputs. This is not always correct for topsoils, but is even more problematic for subsoils, which often contain allochthonous, translocated, relictic or geogenic OC (Kalks et al, 2020;Schneider et al, 2020). As mentioned above, SOC in soils with a C:N ratio >13, which have been classified as 'black sands' (Poeplau et al, 2020;Vos et al, 2018), were excluded since they constitute an extreme example of relictic SOC.…”
Section: Calculation Of the Mean Residence Time Of Organic Carbon Entering The Soilmentioning
confidence: 99%
“…Following Cerri et al (1985) and Kalks et al (2020) we assume that the biogenic carbon in the different soil depths of all sites were relatively similar and overall several orders of magnitude younger than the FOC. The baseline values for this assumption are the depth explicit mean values of Δ 14 C of the mafic and felsic sites as they are free of FOC.…”
Section: Calculation Of Foc Contribution To Total Socbulkmentioning
confidence: 99%
“…For this estimate, we assumed that fossil organic C is free of 14 C due to the high age of parent material (Doetterl et al, 2021 in review;Schlüter, 2006). Further, we assumed that biogenic SOC in the mixed sediment sites had the same radiocarbon values (Fbio) with depth as the mean depth-specific radiocarbon content measured from plateau soils of the mafic and felsic regions (regions without fossil organic C) and that these values represent biogenic SOC from active biological cycling in plant-soils systems (Cerri et al, 1985;Kalks et al, 2020 in review). However, because rates of biogenic C cycling likely vary across sites, with potentially slower biogenic cycling in mixed sediment sites (see Discussion), this estimate is likely an upper bound on the fossil organic C contribution to these samples.…”
Section: Assessing Fossil Vs Biogenic Organic Carbonmentioning
confidence: 99%