Articles | Volume 23, issue 8
https://doi.org/10.5194/bg-23-2803-2026
https://doi.org/10.5194/bg-23-2803-2026
Research article
 | 
22 Apr 2026
Research article |  | 22 Apr 2026

Mercury concentration records in tree rings of sessile oak and Douglas fir – The role of pollution and climate

Alexander Land, Aleta Neugebauer, Jürgen Franzaring, Petra Schmidt, and Harald Biester

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Cited articles

Arnold, J., Gustin, M. S., and Weisberg, P. J.: Evidence for Nonstomatal Uptake of Hg by Aspen and Translocation of Hg from Foliage to Tree Rings in Austrian Pine, Environ. Sci. Technol., 52, 1174–1182, https://doi.org/10.1021/acs.est.7b04468, 2018. 
Baroni, D., Ancora, S., Franzaring, J., Loppi, S., and Monaci, F.: Tree-rings analysis to reconstruct atmospheric mercury contamination at a historical mining site, Front. Plant Sci., 14, 1260431, https://doi.org/10.3389/fpls.2023.1260431, 2023. 
Bohn, F. J., May, F., and Huth, A.: Species composition and forest structure explain the temperature sensitivity patterns of productivity in temperate forests, Biogeosciences, 15, 1795–1813, https://doi.org/10.5194/bg-15-1795-2018, 2018. 
Boonen, K., Shetti, R., Navrátil, T., Nováková, T., Rohovec, J., and Lehejček, J.: Atmospheric mercury pollution recorded in conifer tree rings: Disentangling the effects of tree-ring width, water content, and climate on mercury concentrations, Dendrochronologia, 92, 126370, https://doi.org/10.1016/j.dendro.2025.126370, 2025. 
Bréda, N., Cochard, H., Dreyer, E., and Granier, A.: Field comparison of transpiration, stomatal conductance and vulnerability to cavitation of Quercus petraea and Quercus robur under water stress, Ann. Sci. Forest., 50, 571–582, 1993. 
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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.
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