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Geographica Helvetica
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Volume 70, issue 3
Geogr. Helv., 70, 193-198, 2015
https://doi.org/10.5194/gh-70-193-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Mapping, measuring and modeling in geomorphology

Geogr. Helv., 70, 193-198, 2015
https://doi.org/10.5194/gh-70-193-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Standard article 13 Aug 2015

Standard article | 13 Aug 2015

Risiko des Eintrags von Phosphor in den Hallwilersee durch Bodenerosion

S. Müller1,a and D. Schaub1 S. Müller and D. Schaub
  • 1Departement Bau, Verkehr und Umwelt, Entfelderstr. 22, 5001 Basel, Switzerland
  • aformerly at: Departement Umweltwissenschaften, Klingelbergstr. 27, 4056 Basel, Switzerland

Abstract. An important factor in the release of phosphorus by soil erosion, with corresponding consequences on the quality of surface waters, is the formation of aggregates and their stability. Around the eutrophic Lake Hallwil six arable lands were examined in five repetitions regarding aggregate and particle size distribution, P-contents of the different fractions and aggregate stability. Central to this was the use of the setting column for fractionation of soil samples. In the case of Lake Hallwil the risk of phosphorus discharges by soil erosion seems low since the phosphorus is mainly bound in aggregates which are transported over short distances only. Thus other pathways (runoff from grassland, leaching via drains) may be more important.

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