Stratigraphy of nutrients and metals in sediment profiles of two dimictic lakes in North-Eastern Germany |
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| Authors: | Uwe Selig Thomas Leipe |
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| Institution: | (1) Institute of Bio Science, University of Rostock, Albert Einstein Str. 3, Rostock, 18051, Germany;(2) Marine Geology, Baltic Sea Research Institute, Seestr. 5, Rostock-Warnemünde, 18119, Germany |
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| Abstract: | A sedimentological study of two dimitic lakes in North-Eastern Germany provided a record of anthropogenic impacts and historical
changes of water quality. The upper 50 cm sediment profiles were compared for major nutrients and selected major trace elements.
The sediments were dated by 210Pb and 137Cs measurement. The upper 50 cm sediment profiles represent approximately the last 100 years of history in both lakes. Element
analyses show different characteristic stratigraphic patterns in both lakes. Based on the nutrient and metal stratification,
three characteristic time periods can be documented for both lakes. In addition to agricultural use of the catchment area,
atmospheric pollution greatly influenced the metal concentration in the sediment layers. Variation in the external loading
and redox conditions in the hypolimnion explain the variation in the composition and accumulation of metals in the sediment
stratigraphy. No increases or changes in the trophic level of either lake could be documented based on the accumulation of
the nutrients C, N and P. The ratio of Fe/Mn and Fe/Ca characterized the changing redox conditions. The stratigraphy of Pb
and Zn agrees with the historical variation in atmospheric pollution and confirms literature values for Central and North
Europe. The drop in Pb and Zn over the last 10–15 years is a regional effect in North-Eastern Germany. |
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| Keywords: | Lake sediment Palaeolimnology Geochemistry Nutrients Trace metals Redox transformation Water Management Biogeochemistry Water Quality |
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