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Organic carbon mass accumulation rate regulates the flux of reduced substances from the sediments of deep lakes
Predicting organic matter mineralization in sediments during lake re-oligotrophication
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Titel der Proceedings
The flux of reduced substances from the sediment to the bottom water F(red) is one of the major factors contributing to the consumption of oxygen in the hypolimnia of lakes and thus crucial for lake oxygen management. This study presents sediment porewater measurements at different water depths from five deep lakes of differing trophic states. F(red) was directly proportional to the total organic carbon mass accumulation rate (TOC-MAR) measured in the sediments. In eutrophic lakes F(red) decreased systematically with increasing mean hypolimnion depth (zH). In Lake Baldegg, both TOC- MAR and F(red) increased with depth due to sediment focusing. Temporarily anoxic conditions increased F(red) even in the oligotrophic Lake Aegeri, while F(red) was surprisingly low in the 310 m deep but eutrophic Lake Geneva. As TOC-MAR and zH are based on more commonly available data sets, these relationships provide an estimate for the O2 consumption by F(red), where no direct flux measurements are available.