Abstract
Detailed stratigraphic analyses of sediments deposited in Lake Botjärnen, a small boreal forest lake in the shield terrain of central Sweden, clearly reflect progressively increasing human impact on terrestrial and aquatic ecosystems following settlement and establishment of an iron industry in the 17th century. Rising frequencies of pollen and spores from light-demanding plants provide evidence of extensive forest clearance for charcoal and timber production, which peaked in the early 20th century. An associated increase in catchment erosion is reflected by changing carbon and nitrogen elemental content and carbon–isotope composition of sediment organic matter and by increased magnetic susceptibility of the sediments. Records of air-borne pollutants (lead, zinc and sulphur) can be correlated to the development of local and regional mining and metal industry as inferred from historical accounts. Rapid recession of the iron industry led to re-forestation and recovery of the aquatic nutrient status to pre-industrial conditions over the past 100 years. The chronology of the sediment succession, which is based on 210Pb and 137Cs radionuclide data in combination with radiocarbon dating, is confirmed by historical lead pollution trends established for the region.
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Acknowledgements
We express our gratitude to Urban Ahlström, Kloten, for logistic support, Bengt Johansson, Kloten, for historical documentation, Per Nyberg, Swedish Board of Fisheries, for limnological information, Janet Hope and Tula Maxsted for laboratory assistance, Natalie St. Amour for comments on the radionuclide data, Sylvia Peglar for advice on pollen determination and John Birks for help with the rarefaction analysis. We thank John Boyle and an anonymous reviewer for constructive comments on the manuscript. Financial support was provided by the Swedish Research Council and the UCL Geography Mead Scholarship Fund.
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Hammarlund, D., Mackay, A.W., Fallon, D.M.J. et al. A sedimentary record of the rise and fall of the metal industry in Bergslagen, south central Sweden. J Paleolimnol 39, 463–475 (2008). https://doi.org/10.1007/s10933-007-9124-z
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DOI: https://doi.org/10.1007/s10933-007-9124-z