Abstract
On the basic of selective extractions, loosely sorbed phosphorus (ADS-P) has been shown to constitute much of the total phosphorus in the P-rich near-surface sediments of Lake Søbygaard, Denmark. The concentrations of ADS-P are seasonally variable, ranging from 0.2 mg Pg−1 DW in the winter to more than 2 mg Pg−1 DW in the summer. The variations can be observed as deep as 10 cm into the sediment but are most pronounced in the upper few centimeters.
During the summer, lake and pore water pH levels are very high, and photosynthetic activity causes elevation to pH 10–11 in the lake. Laboratory experiments demonstrated a strong association between ADS-P and high pore water pH.
It is likely that Lake Søbygaard represents an extreme example of pH control on sediment/water phosphorus equilibria in which high concentrations of internal ADS-P contribute significantly to the total P load of the Lake.
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Søndergaard, M. Seasonal variations in the loosely sorbed phosphorus fraction of the sediment of a shallow and hypereutrophic lake. Environ. Geol. Water Sci 11, 115–121 (1988). https://doi.org/10.1007/BF02587770
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DOI: https://doi.org/10.1007/BF02587770