Phosphorus sorption experiments and the potential for internal phosphorus loading in littoral areas of a stratified lake |
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Authors: | Hélène Cyr Shelley K McCabe Gertrud K Nürnberg |
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Affiliation: | a Department of Ecology and Evolutionary Biology, Ramsay Wright Zoological Labs, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5 b Freshwater Research, 3421 Hwy 117, Baysville, Ontario, Canada P0B 1A0 |
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Abstract: | The exchange of phosphorus (P) during the resuspension of sediments into shallow (oxic) waters of deep stratified lakes is regulated by equilibrium dynamics. In this study, we compared the P-sorption characteristics of sediments from 17 shallow and deep littoral sites in an oligo-mesotrophic lake. Zero Equilibrium P Concentration (EPC0) ranged from 0.2 to 5 μg P L−1. EPC0 did not vary with sediment characteristics, but increased with increasing sediment-to-water ratios (SWR). Buffering capacity also increased with increasing SWR up to 1 g L−1, at which point P concentrations were buffered almost perfectly. Therefore, internal P loading in littoral areas may depend primarily on the intensity and duration of sediment resuspension instead of sediment composition, and is expected to be spatially and temporally patchy. Maximum P-sorption capacity (Smax) varied with chemical composition of the sediments, but was generally low, indicating a limited capacity of littoral sediments to retain external inputs of P. |
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Keywords: | Phosphorus Internal loading Sediment resuspension P sorption Oxic Littoral Lake |
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