Articles | Volume 17, issue 8
Biogeosciences, 17, 2169–2180, 2020
https://doi.org/10.5194/bg-17-2169-2020
Biogeosciences, 17, 2169–2180, 2020
https://doi.org/10.5194/bg-17-2169-2020

Research article 20 Apr 2020

Research article | 20 Apr 2020

Understanding the effects of early degradation on isotopic tracers: implications for sediment source attribution using compound-specific isotope analysis (CSIA)

Pranav Hirave et al.

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Alewell, C., Birkholz, A., Meusburger, K., Schindler Wildhaber, Y., and Mabit, L.: Quantitative sediment source attribution with compound-specific isotope analysis in a C3 plant-dominated catchment (central Switzerland), Biogeosciences, 13, 1587–1596, https://doi.org/10.5194/bg-13-1587-2016, 2016. 
Amblès, A., Jambu, P., Parlanti, E., Joffre, J., and Riffe, C.: Incorporation of natural monoacids from plant residues into an hydromorphic forest podzol, Eur. J. Soil Sci., 45, 175–182, https://doi.org/10.1111/j.1365-2389.1994.tb00499.x, 1994a. 
Amblès, A., Parlanti, E., Jambu, P., Mayoungou, P., and Jacquesy, J.-C.: n-Alkane oxidation in soil, Formation of internal monoalkenes, Geoderma, 64, 111–124, https://doi.org/10.1016/0016-7061(94)90092-2, 1994b. 
Blake, W. H., Ficken, K. J., Taylor, P., Russell, M. A., and Walling, D. E.: Tracing crop-specific sediment sources in agricultural catchments, Geomorphology, 139–140, 322–329, https://doi.org/10.1016/j.geomorph.2011.10.036, 2012. 
Blessing, M., Jochmann, M. A., and Schmidt, T. C.: Pitfalls in compound-specific isotope analysis of environmental samples, Anal. Bioanal. Chem., 390, 591–603, https://doi.org/10.1007/s00216-007-1588-1, 2008. 
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Sediment input into water bodies is a prominent threat to freshwater ecosystems. We tested the stability of tracers employed in freshwater sediment tracing based on compound-specific isotope analysis during early degradation in soil. While bulk δ13C values showed no stability, δ13C values of plant-derived fatty acids and n-alkanes were stably transferred to the soil without soil particle size dependency after an early degradation in organic horizons, thus indicating their suitability as tracers.
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