Mechanisms Controlling Fluxes of Nutrients Across the Sediment/Water Interface in a Eutrophic Lake

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Abstract
In oligotrophic lakes with low nutrient concentrations, primary production is low, hypolimnetic oxygen (O2) concentration is generally high, and a large fraction of the settled phosphorus (P) is permanently buried in the sediments. In the deep hypolimnion, ammonia (NH4+) usually occurs in trace concentrations and nitrate (NO3−) neither accumulates nor decreases during summer stagnation. This suggests that the NH4+ released during decomposition of organic material is oxidized to NO3− and then denitrified to a large extent within the sediment.

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