Journal of Paleolimnology

, Volume 3, Issue 2, pp 161–169 | Cite as

Drainage ditch erosion history as recorded in the varved sediment of a small lake in East Finland

  • Olavi Sandman
  • Anita Lichu
  • Heikki Simola
Article

Abstract

Short core stratigraphy of total N, P, Zn, Hg and diatoms were investigated in the varved sediment of Lake Heinälampi, a small 8 m deep pond in East Finland. The sediment has recently changed from organic mud to minerogenic silt. The presence of varved sediment offers independent control for 210Pb and 137Cs dates and these are in good agreement: the sediment quality initially changed around the year 1930 due to increaed field erosion, and the inflow of mineral matter was further increased by ditching of paludified forests in 1980.

Diatom analysis reveals that eutrophication has occurred before and concurrent with the sedimentary change. The causes of eutrophication and the increased levels of Zn and Hg are discussed.

Key words

paleolimnology artificial drainage ditch erosion sediment varves 210Pb-dating 

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Olavi Sandman
    • 1
  • Anita Lichu
    • 2
  • Heikki Simola
    • 3
  1. 1.Mikkeli District OfficeNational Board of Waters and EnvironmentMikkeliFinland
  2. 2.Reactor Lab.Technical Res. Center of FinlandEspooFinland
  3. 3.Karelian instituteUniv. JoensuuJoensuuFinland

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