Journal
WATER RESEARCH
Volume 43, Issue 6, Pages 1654-1666Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2008.12.050
Keywords
Phosphorus; Internal loading; Sediment resuspension; P sorption; Oxic; Littoral; Lake
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Summer Career Placement Program of the Human Resources Development Canada
- Ontario Ministry of Education and Training and the University of Toronto
- General Motors Women in Science and Mathematics scholarship and a University of Toronto
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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 (EPCo) ranged from 0.2 to 5 mu g P L-1. EPCO 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 (S-max) varied with chemical composition of the sediments, but was generally low, indicating a limited capacity of littoral sediments to retain external inputs of P. (C) 2009 Elsevier Ltd. All rights reserved.
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