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Estimation of denitrification potential in a karst aquifer using the 15N and 18O isotopes of NO −3

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Abstract.

A confined aquifer in the Malm Karst of the Franconian Alb, South Germany was investigated in order to understand the role of the vadose zone in denitrifiaction processes. The concentrations of chemical tracers Sr2+ and Cl− and concentrations of stable isotope 18O were measured in spring water and precipitation during storm events. Based on these measurements a conceptual model for runoff was constructed. The results indicate that pre-event water, already stored in the system at the beginning of the event, flows downslope on vertical and lateral preferential flow paths. Chemical tracers used in a mixing model for hydrograph separation have shown that the pre-event water contribution is up to 30%. Applying this information to a conceptual runoff generation model, the values of δ15N and δ18O in nitrate could be calculated. Field observations showed the occurence of significant microbial denitrification processes above the soil/bedrock interface before nitrate percolates through to the deeper horizon of the vadose zone. The source of nitrate could be determined and denitrification processes were calculated. Assuming that the nitrate reduction follows a Rayleigh process one could approximate a nitrate input concentration of about 170 mg/l and a residual nitrate concentration of only about 15%. The results of the chemical and isotopic tracers postulate fertilizers as nitrate source with some influence of atmospheric nitrate. The combined application of hydrograph separation and determination of isotope values in δ15N and δ18O of nitrate lead to an improved understanding of microbial processes (nitrification, denitrification) in dynamic systems.

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  1. Institute for Groundwater Ecology, GSF-National Research Center for Environment and Health, Ingolstädter Landstr. 1, D-85764, Neuherberg, Germany

    Florian Einsiedl, Piotr Maloszewski & Willibald Stichler

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  1. Florian Einsiedl
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  2. Piotr Maloszewski
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  3. Willibald Stichler
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Correspondence to Florian Einsiedl.

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Einsiedl, F., Maloszewski, P. & Stichler, W. Estimation of denitrification potential in a karst aquifer using the 15N and 18O isotopes of NO −3 . Biogeochemistry 72, 67–86 (2005). https://doi.org/10.1007/s10533-004-0375-8

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  • DOI: https://doi.org/10.1007/s10533-004-0375-8

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