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• W4285799722 abstract "Abstract Agricultural soils contribute significantly to global CO 2 emissions. Soils can be both a CO 2 sink and source depending on vegetation cover and the physical‐chemical characteristics of the soil environment. This study uses a new 14 C dating approach to elucidate soil physical and geochemical properties that drive the production and transport of CO 2 in cultivated and noncultivated drainage ditch soil environments. As expected, CO 2 production and fluxes decrease with soil depth. Relating depth‐specific subsurface radiocarbon of CO 2 ( 14 CO 2 ) to the atmospheric scenario generated from the testing of thermonuclear bombs in the 1950s and 1960s provides a means to date the labile organic C pools responsible for soil respiration that are otherwise generalized as having a modern age (≤1950 AD). Depth‐specific 14 CO 2 measurements showed that CO 2 in shallow soils (≤22.5‐cm depth) have a younger age than CO 2 in deeper soils (>22.5‐cm depth). The 14 CO 2 of surface emissions were comparable to those of shallow soils (≤22.5‐cm depth), showing that respiration in the deeper soils (>22.5‐cm depth) do not contribute significantly to surface emissions, and the higher CO 2 concentrations at depth in soil result from processes limiting CO 2 transport to surface. Coupling the 14 C data with CO 2 flux profiles confirms that CO 2 effluxes are derived from modern soil organic C (<10 yr since sequestered) from the shallowest soil depths in all soil environments studied, but changes in physical soil processes governing gas transport at depth could release these deeper CO 2 stores." @default.
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• W4285799722 date "2022-07-19" @default.
• W4285799722 modified "2023-10-02" @default.
• W4285799722 title "Relationships between carbon age and CO₂ efflux in agricultural and drainage ditch soils using the thermonuclear bomb pulse" @default.
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• W4285799722 doi "https://doi.org/10.1002/vzj2.20208" @default.
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