Horizontal distribution of sediment phosphorus in shallow eutrophic Lake Võrtsjärv (Estonia)

  • Peeter Nõges
  • Anu Kisand
Part of the Developments in Hydrobiology book series (DIHY, volume 143)


Effective wind fetch and lake width in the dominating wind direction accounted for 87% of the observed spatial variability of sediment dry weight in large (270 km2), shallow (mean depth 2.8 m) eutrophic Lake VOrtsjArv, Estonia. Focusing of lighter sediments to more sheltered bottom areas was reflected also in the horizontal distribution of sediment phosphorus forms which correlated strongly (R 2 from 0.72 to 0.96) with the dry matter content of the surficial 10 cm sediment. Loosely bound (NH4C1-RP), Fe- and Al-bound (NaOH-RP), and organic phosphorus (NaOH-NRP) revealed strong positive intercorrelation (r 2 from 0.72 to 0.87). Ca-bound phosphorus (HCl-RP) correlated negatively with the three former fractions. In contrast to the other fractions, CH1-RP correlated better with general sediment characteristics, such as dry weight, bulk density and loss on ignition, when volumetric concentrations were used. Relatively constant HCl-RP content per dry weight in sediments of different grain size suggests that Ca-bound phosphorus was included in the particle matrix, apatite probably forming its major part. As apatite belongs to a heavier crystalline fraction, it is more resistant to resuspension. Therefore, HCl-RP was the overwhelming form of phosphorus in erosion areas, where its volumetric concentration was up to 30 times higher than in organic-rich soft sediments.

Key words

lake morphometry wind fetch sediment phosphorus fractionation 


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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Peeter Nõges
    • 1
  • Anu Kisand
    • 2
  1. 1.Võrtsjärv Limnological Station, Institute of Zoology and BotanyEstonian Agricultural UniversityRannu, Tartu countyEstonia
  2. 2.Institute of Zoology and HydrobiologyTartu UniversityEstonia

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