Bacterial decomposition of organic matter in lacustrine sediments

  • V. G. Drabkova
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 15)

Abstract

The investigations were carried out in lakes situated in the forest zone (Karelian Isthmus, Baltic zone, South Ural) and in the forest-steppe (South Ural) of the USSR. The lakes differ in their bioproductivity and in the intensity of their human influence. The amount of organic matter accumulating in the sediments is closely related to production and decomposition processes in the trophogenic layer. Processes of organic matter transformation were found to be most active in the uppermost sediment. The quantity of bacteria shows no correlation with the organic matter content of the sediment. Increase in organic matter, up to 70–80% of dry weight, is often accompanied by a decrease in bottom bacteria. The intensity of aerobic decomposition of the labile organic matter can be judged from the oxygen demand of the sediments. However, it is important to differentiate between chemical and biological oxidation processes. The quantity of bottom bacteria correlates closely with the value of oxygen consumption only in cases of high sediment redox potentials

Keywords

paleolimnology organic matter bacteria aerobic decomposition oxygen consumption 

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Copyright information

© Dr W. Junk Publisher, The Hague 1983

Authors and Affiliations

  • V. G. Drabkova
    • 1
  1. 1.Institute of Lake ResearchAcademy of Sciences of the U.S.S.R.LeningradUSSR

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