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- W2021830110 abstract "Recent (<7 years old) cave sediments in Speedwell Cavern, Derbyshire, show an approximately exponential decay of organic carbon with depth. This phenomenon was thought to be due to one of two causes: (i) changing agricultural practice within the catchment feeding the cave, especially the increased use of sewage sludge and animal slurry as fertilizer; (ii) a relatively constant organic carbon concentration over time in the input sediment, with subsequent carbon mineralization during diagenesis. Carbon isotope composition of the organic material and the evolution of H C ratio with depth indicate that the latter hypothesis is correct and that the profiles result from microbial diagenesis, not increased organic carbon inputs. By comparison with sediment of known (7 years) age, temporal decay constants for organic matter can be derived; these lie between rates previously determined for organic matter decomposition in marine sediments and soils. The H C ratio of organic matter can be modelled as a function of time and proceeds in a similar fashion to soil organic material." @default.
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- W2021830110 title "Organic carbon concentration profiles in recent cave sediments: Records of agricultural pollution or diagenesis?" @default.
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- W2021830110 doi "https://doi.org/10.1016/0269-7491(95)00064-x" @default.
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