Biogeosciences
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Articles | Volume 21, issue 15
Articles | Volume 21, issue 15
https://doi.org/10.5194/bg-21-3537-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-3537-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 15
Research article
 | 
08 Aug 2024
Research article |  | 08 Aug 2024

From Iron Curtain to green belt: shift from heterotrophic to autotrophic nitrogen retention in the Elbe River over 35 years of passive restoration

Alexander Wachholz, James W. Jawitz, and Dietrich Borchardt

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Latest update: 26 Jul 2025
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Short summary
Human activities are rivers' main source of nitrogen, causing eutrophication and other hazards. However, rivers can serve as a natural defense mechanism against this by retaining nitrogen. We show that the Elbe River retains more nitrogen during times of high pollution. With improvements in water quality, less nitrogen is retained. We explain this with changed algal and bacterial activities, which correspond to pollution and have many implications for the river and adjacent ecosystems.
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