Original Articles
Vol. 62 No. 2 (2003)
https://doi.org/10.4081/jlimnol.2003.151

Characterisation and quantification of phosphorus release from profundal bottom sediments in two dimictic lakes during summer stratification

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Received: 8 December 2011
Published: 1 August 2003
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phosphorus release, phosphorus fractionation, sediment, redox condition, dimictic lakes

Authors

Uwe SELIG
uwe.selig@biologie.uni-rostock.de
, .
Günter SCHLUNGBAUM†
, .
Phosphorus release from the sediment in two dimictic lakes was compared during the summer stratification. Soluble reactive phosphate (SRP) and also NH4 + were released from the anoxic sediment into the water column in Lake Dudinghausen and Lake Tiefer. The sediment released NH4 + and SRP only when oxygen and nitrate/nitrite were absent. Besides the SRP concentration in the hypolimnion, P-binding in the upper sediment changed during summer stratification in both lakes. In Lake Dudinghausen a decrease in the redox-sensitive bound P was observed in the upper sediment. Only in this lake does the classic anoxic P-release by reduction of the FeOOH-phosphate complex play a dominant role. In both lakes, however, the contents of organically bound P increased in the upper 0.5 cm layer during the summer stratification. P-release was calculated using four different methods. The calculated P-release during summer stratification varied between 15 and 207 mg P m-2 y-1 in Lake Dudinghausen and between 22 and 55 mg P m-2 y-1 in Lake Tiefer.

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1.
SELIG U, SCHLUNGBAUM† G. Characterisation and quantification of phosphorus release from profundal bottom sediments in two dimictic lakes during summer stratification. J Limnol [Internet]. 2003 Aug. 1 [cited 2026 Jul. 19];62(2):151-62. Available from: https://www.jlimnol.it/jlimnol/article/view/jlimnol.2003.151