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Summary
Four lakes in northern Sweden, all of them having varved sediments have been investigated. The annual deposition rate of organic and mineral matter has been calculated. Changes in vegetation and the history of land use have been studied mainly by pollen analysis.
An increase in the annual deposition of both organic as well as mineral matter has occurred due to land use. The changes in deposition become especially striking during the period of agricultural expansion that has taken place in the 19th and 20th century. The organic deposition has increased by about 100% and the deposition of inorganic matter has increased by about 150–200% during the last 200 years. Eutrophication causing higher production in the lakes and/or erosion and subsequent supply of allochthonous material into the lakes seem to be the most possible reasons to these changes.