Phosphorus sedimentation in seven basins of Lake Lucerne, Switzerland

In 1989 sedimentation in seven basins of oligotrophic Lake Lucerne was measured by means of cylindrical traps below the epilimnion (30-50 m) and in the hypolimnion 5 m above lake bottom. The aim of this study was to evaluate horizontal P sedimentation differences and the possible causes thereof. By...

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Bibliographic Details
Published in:Hydrobiologia 1993-03, Vol.253 (1-3), p.319-319
Main Author: Bloesch, J urg
Format: Article
Language:English
Subjects:
Freshwater
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Summary:In 1989 sedimentation in seven basins of oligotrophic Lake Lucerne was measured by means of cylindrical traps below the epilimnion (30-50 m) and in the hypolimnion 5 m above lake bottom. The aim of this study was to evaluate horizontal P sedimentation differences and the possible causes thereof. By means of measuring autochthonous primary production, mean sestonic PP concentration, major allochthonous P inputs and the P output, and increments in bottom sediments, the fate of P in the different lake basins might be elucidated, despite the complicated morphological structure of Lake Lucerne. The annual PP flux in the seven basins ranged between 0.6 and 2.0 g PP/m super(2)/yr. PP fluxes varied not only horizontally, but also seasonally and vertically between 0.4 and 11.7 mg PP/m super(2)/d, with one extreme sedimentation rate of 32 mg PP/m super(2)/d in a sediment trap 5 m above lake bottom, measured after a rainfall event in one basin and indicating a turbidity current.
ISSN:0018-8158
1573-5117
DOI:10.1007/BF00050752