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The N and P budget of the shallow, flushed lake Müggelsee: retention, external and internal load

  • Hans-Peter Kozerski
  • Horst Behrendt
  • Jan Köhler
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  • 353 Downloads
Part of the Developments in Hydrobiology book series (DIHY, volume 143)

Abstract

The shallow (mean depth 4.9 m), polymictic and eutrophic lake Müggelsee was highly loaded with phosphorus (6 gP m−2 a−1) and nitrogen (170 gN m−2 a−1) by the river Spree up to the end of the 1980s. Annual load declined by 40–50% during the last years (1991–97). Phosphorus retention fluctuated strongly during the seasonal cycle between −200 and +100 kgP d−1 and from year to year between −44% and + 26% of the P import. At the end of the eighties, the P retention capacity of the sediment was exceeded and Müggelsee became a source of phosphorus. The lake regained its ability to retain P in the sediments after external load reduction in the 1990s. However, the internal load of P reached the level of the external one. The release of P during summer was strongly related to the import of nitrate. On long-term average (1979–1997), less than 1% of the P input was retained in Müggelsee. About 24% of the nitrogen load were removed in the lake on annual mean. This rate decreased during the last years.

Key words

shallow lake nutrient loading retention nitrogen phosphorus release 

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Hans-Peter Kozerski
    • 1
  • Horst Behrendt
    • 1
  • Jan Köhler
    • 1
  1. 1.Institute of Freshwater Ecology and Inland FisheriesBerlinGermany

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