Sauerstoffzehrungsraten von Profundalsediment des Bodensee-Obersees unter oxischen und anoxischen Bedingungen |
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| Authors: | Dr Tönnies Frevert |
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| Institution: | 1. Lehrstuhl für Hydrologie der Universit?t, Postfach 3008, D-8580, Bayreuth, BRD
2. Kinneret Limnological Laboratory, P.O. Box 345, Tiberias, Israel
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| Abstract: | Oxygen uptake rates by the sediment have been determined in a natural stratified sediment-water system from Lake Constance (Obersee, max. depth). After oxic preconditioning of the system the uptake rates ranged between 855 and 1,062 mg·m?2·d?1; after anoxic preconditioning of the system they ranged between 3,405 and 3,794 mg·m?2·d?1. These data, and the electron activity buffer capacity and oxygen consumption intensity as found in Lake Constance profundal water, show that the oxic-anoxic transition will happen here at the earliest after 142 days (about 4.5 months) of total oxygen isolation. Reoxygenation requires at least 3.7 times higher O2 input than supposed for a ‘normal’ winter circulation in Obersee. |
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