Nitrogen cycling across the sediment-water interface in an eutrophic, artificially oxygenated lake

Processes controlling the nitrogen (N) exchange between water and sediment in eutrophic Lake Sempach were studied using three different independent methods: benthic flux chambers, interstitial water data and hypolimnetic mass balances. The sediments released NH 4 + (1.1–16.1 mmoles m−2 d−1), NO 2 - (0.1–0.4 mmoles m−2 d−1) and dissolved organic N (