Abstract
Prealpine Lake Lungern shows in spite of low primary production rates (120 g C/m2. year) and full winter overturns a complete oxygen depletion in the deepest hypolimnion (65–70 m below surface) towards the end of summer stagnation. Periodical examinations of O2- and CH4-concentrations, CH4-oxidation rates and temperature in the water column during 1975/76 enabled an O2-balance of Lake Lungern. The direct measurement of the CH4-flux at the sediment-water-interface and of the CH4-concentrations in sediment cores as well as the determination of the age of methane bubbles lead to the conclusion, that the hypolimnic oxygen depletion is partly due to the oxidation of fossile methane penetrating the lake from below.
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