Articles | Volume 23, issue 8
https://doi.org/10.5194/bg-23-2803-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-2803-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Mercury concentration records in tree rings of sessile oak and Douglas fir – The role of pollution and climate
Alexander Land
CORRESPONDING AUTHOR
Institute of Biology (190a), University of Hohenheim, Stuttgart, Germany
Aleta Neugebauer
Institute of Biology (190a), University of Hohenheim, Stuttgart, Germany
Jürgen Franzaring
Institute of Landscape and Plant Ecology (320), University of Hohenheim, Stuttgart, Germany
Petra Schmidt
Institute for Geoecology, Department of Environmental Geochemistry, Technische Universität Braunschweig, Germany
Harald Biester
CORRESPONDING AUTHOR
Institute for Geoecology, Department of Environmental Geochemistry, Technische Universität Braunschweig, Germany
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Juan Francisco Morales Arteaga, Grace Tatiana Páez-Barrera, Matthias Beyer, Christian Birkel, Werner Huber, María Auxiliadora Zúñiga Amador, Harald Biester, and Marta Pérez-Rodríguez
EGUsphere, https://doi.org/10.5194/egusphere-2026-1354, https://doi.org/10.5194/egusphere-2026-1354, 2026
This preprint is open for discussion and under review for Biogeosciences (BG).
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Mercury (Hg) is a toxic pollutant that vegetation removes from the atmosphere. We examined how rainfall seasonality regulates Hg sequestration in understudied tropical dry and rainforests. Dry forests showed strong seasonality, with Hg uptake peaking in the wet season, while high water availability kept stable uptake in rainforests. Vegetation absorbed Hg in both, but higher litterfall enhanced Hg transfer to rainforest soils, emphasizing tropical forests as major yet vulnerable global Hg sinks.
David S. McLagan, Carina Esser, Lorenz Schwab, Jan G. Wiederhold, Jan-Helge Richard, and Harald Biester
SOIL, 10, 77–92, https://doi.org/10.5194/soil-10-77-2024, https://doi.org/10.5194/soil-10-77-2024, 2024
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Sorption of mercury in soils, aquifer materials, and sediments is primarily linked to organic matter. Using column experiments, mercury concentration, speciation, and stable isotope analyses, we show that large quantities of mercury in soil water and groundwater can be sorbed to inorganic minerals; sorption to the solid phase favours lighter isotopes. Data provide important insights on the transport and fate of mercury in soil–groundwater systems and particularly in low-organic-matter systems.
Laura Balzer, Carluvy Baptista-Salazar, Sofi Jonsson, and Harald Biester
Biogeosciences, 20, 1459–1472, https://doi.org/10.5194/bg-20-1459-2023, https://doi.org/10.5194/bg-20-1459-2023, 2023
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Toxic methylmercury (MeHg) in lakes can be enriched in fish and is harmful for humans. Phytoplankton is the entry point for MeHg into the aquatic food chain. We investigated seasonal MeHg concentrations in plankton of a productive lake. Our results show that high amounts of MeHg occur in algae and suspended matter in lakes and that productive lakes are hot spots of MeHg formation, which is mainly controlled by decomposition of algae organic matter and water-phase redox conditions.
David S. McLagan, Harald Biester, Tomas Navrátil, Stephan M. Kraemer, and Lorenz Schwab
Biogeosciences, 19, 4415–4429, https://doi.org/10.5194/bg-19-4415-2022, https://doi.org/10.5194/bg-19-4415-2022, 2022
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Spruce and larch trees are effective archiving species for historical atmospheric mercury using growth rings of bole wood. Mercury stable isotope analysis proved an effective tool to characterise industrial mercury signals and assess mercury uptake pathways (leaf uptake for both wood and bark) and mercury cycling within the trees. These data detail important information for understanding the mercury biogeochemical cycle particularly in forest systems.
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Short summary
Trees take up mercury through their leaves and enrich it in their tree-rings. We investigated tree-ring records of oak and Douglas fir in Germany reaching back ~120 years. We have found that the overall magnitude of mercury loads in trees are determined by local atmospheric Hg concentrations while changes in mercury uptake are controlled by climate. Oak and Douglas fir show different Hg records through time as a results of different adaptation strategies to high temperatures and drought.
Trees take up mercury through their leaves and enrich it in their tree-rings. We investigated...
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