Journal
ECOLOGICAL MODELLING
Volume 251, Issue -, Pages 246-259Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecolmodel.2012.12.008
Keywords
Early diagenesis; Nutrients; Reaction-transport modeling; Hypolimnion aeration; Restoration; Lake sediment
Categories
Funding
- Swiss National Science Foundation (SNF) [200021-107985/1]
- Natural Science and Engineering Research Council of Canada (NSERC)
- University of Minnesota
- University of Toronto
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Phosphorus (P) releases from lake sediments are controlled in the long term by P burial into the deep sediment and on shorter time scales by the redox conditions at the sediment-water interface. In Lake Sempach (Switzerland), hypolimnetic oxygen concentration was increased by artificial aeration after two decades of nearly anoxic conditions. Using diagenetic reaction-transport modeling and sediment core analysis, we investigated the effects that this change, as well as variations in the organic carbon loadings, had on the long-term mobility of sediment P. During low-oxygen conditions, the reducible iron pool in the sediment was depleted, resulting in the release of previously accumulated P. The remobilization of iron-bound P affected phosphate effluxes from the sediment on the time scale of the sediment iron cycle (several years). On longer time scales, P effluxes followed the sedimentation fluxes of organic matter. Mass balance calculations indicate that, despite the dominance of internal P loading in Lake Sempach, over the long-term phosphorus content in the water column was controlled by the external P inputs. The results suggest that, whereas short-term decreases in sediment P releases may be achieved by preventing sediment anoxia, long-term solutions should involve reductions in the external P inputs. (C) 2012 Elsevier BY. All rights reserved.
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