Biogeosciences
Biogeosciences
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Articles | Volume 22, issue 19
Articles | Volume 22, issue 19
https://doi.org/10.5194/bg-22-5535-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-5535-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 19
Research article
 | 
14 Oct 2025
Research article |  | 14 Oct 2025

N transformations in nitrate-rich groundwaters: combined isotope and microbial approach

Sushmita Deb, Mikk Espenberg, Reinhard Well, Michał Bucha, Marta Jakubiak, Ülo Mander, Mariusz-Orion Jędrysek, and Dominika Lewicka-Szczebak

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Latest update: 14 Oct 2025
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Short summary
This study investigates nitrogen cycling in groundwater from an agricultural area using organic fertilizer. The research combines isotope and microbial studies to track transformations. High-nitrate samples were incubated with a low addition of 15N tracer. Results showed a shift from archaeal nitrification to bacterial denitrification under low oxygen with glucose, confirmed by isotope and microbial analyses. The findings offer insights for improving water quality and pollution management.
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