Influence of catchment vegetation on mercury accumulation in lake sediments from a long-term perspective
Organic matter (OM) cycling has a large impact on the cycling of mercury (Hg) in the environment. Hence, it is important to have a thorough understanding on how changes in, e.g., catchment vegetation - through its effect on OM cycling - affect the behavior of Hg. To test whether shifts in vegetation...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
[15 December 2015]
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| In: |
The science of the total environment
Year: 2015, Volume: 538, Pages: 896-904 |
| ISSN: | 1879-1026 |
| DOI: | 10.1016/j.scitotenv.2015.08.133 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1016/j.scitotenv.2015.08.133 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0048969715306355 
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| Author Notes: | Johan Rydberg, Manfred Rösch, Emanuel Heinz, Harald Biester |
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| 520 | |a Organic matter (OM) cycling has a large impact on the cycling of mercury (Hg) in the environment. Hence, it is important to have a thorough understanding on how changes in, e.g., catchment vegetation - through its effect on OM cycling - affect the behavior of Hg. To test whether shifts in vegetation had an effect on Hg-transport to lakes we investigated a sediment record from Herrenwieser See (Southern Germany). This lake has a well-defined Holocene vegetation history: at ~8700years BP Corylus avellana (hazel) was replaced by Quercus robur (oak), which was replaced by Abies alba (fir) and Fagus sylvatica (beech) ~5700years BP). We were particularly interested in testing if coniferous vegetation leads to a larger export of Hg to aquatic systems than deciduous vegetation. When hazel was replaced by oak, reduced soil erosion and increased transport of DOM-bound mercury from the catchment resulted in increases in both Hg-concentrations and accumulation rates (61ngg−1 and 5.5ngcm−2yr.−1 to 118ngg−1 and 8.5ngcm−2yr.−1). However, even if Hg-concentrations increased also in association with the introduction of fir and beech (173ngg−1), as a result of higher Hg:C, there was no increase in Hg-accumulation rates (7.6ngcm−2yr.−1), because of a decreased input of OM. At around 2500years BP Hg-accumulation rates and Hg-concentration indicated an additional input of Hg to the sediment (316ngg−1 and 10.3ngcm−2yr.−1), which might be due to increased human activities in the area, e.g., forest burning or mining. Our results contrast those of several paired-catchment studies that suggest a higher release of Hg from coniferous than deciduous forest, and there is a need for studies with a long-term perspective to increase our understanding of the effects of slow and gradual processes on mercury cycling. | ||
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