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Deep root activity overprints weathering of petrogenic organic carbon in shale

May 15, 2023

The oxidation of organic carbon in sedimentary bedrock (petrogenic OC, OCpetro">petro) is increasingly recognized as a potential source of CO2 to the atmosphere. Recent studies provide evidence for the mobilization and oxidation of OCpetro">petro in sedimentary bedrock during rock weathering. However, the mechanisms and rates remain uncertain, particularly where overlying soils and vegetation drive contemporaneous oxidation of recently fixed organic carbon. Here, we quantify OCpetro">petro weathering across a 16 m shale depth profile in a steep, rapidly eroding forested hillslope in the Northern California Coast Ranges. We report solid and gas phase radiocarbon and stable isotope analyses of samples extracted from specialized in-situ samplers, and a supporting laboratory incubation experiment of the shale regolith. OCpetro">petro is removed from the weathered bedrock at a rate of approximately 0.12 gC/m3yr, which is orders of magnitude lower than the rate of OCpetro">petro oxidation we achieved in the laboratory with crushed samples (557.1 gC/m3/yr). This disparity occurs despite high O2(g)">2(g) content across the depth profile, indicating that physical accessibility of OCpetro">petro can regulate oxidative weathering. There is no direct radiocarbon evidence of OCpetro">petro oxidation in CO2(g)">2(g) across the upper 13 m of the weathering profile during both wet and dry seasons. Instead, vadose zone CO2(g)">2(g) production at the site is dominated by respiration of recently fixed carbon associated with deep rooting. OCpetro">petro is clearly mobilized across the vadose zone during weathering in this rapidly eroding, oxygen-rich, biologically dynamic hillslope, but at rates far below what can be measured given the contribution of root-derived CO2(g)">2(g).

Publication Year 2023
Title Deep root activity overprints weathering of petrogenic organic carbon in shale
DOI 10.1016/j.epsl.2023.118048
Authors Alison K. Tune, Jennifer L. Druhan, Corey Lawrence, Daniella M. Rempe
Publication Type Article
Publication Subtype Journal Article
Series Title Earth and Planetary Science Letters
Index ID 70243598
Record Source USGS Publications Warehouse
USGS Organization Geosciences and Environmental Change Science Center