Journal
WATER RESEARCH
Volume 40, Issue 2, Pages 383-391Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2005.11.013
Keywords
sediment; phosphorus; mobility; composition; bio-regulation; eutrophication
Funding
- Natural Environment Research Council [ceh010022] Funding Source: researchfish
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Temporal and spatial variation in sediment P composition and mobility were investigated in Loch Leven. Little change was observed in total sediment P (surface sediment at 4m depth), in comparison to a previous study (1990), despite significant reduction of external point sources of P. Labile P and residual P have both increased (0.007-0.039 mg PO4-P and 0.121-0.420 mg PO4-P per gram dry weight of sediment, respectively) since 1990. An analysis of P fractions, along a depth transect, indicated elevated labile P concentrations in shallow water sediment (< 12 m overlying water depth). Regression analysis showed that spatial variability in reductant-adsorbed P was significantly related to sediment chlorophyll a concentration (R-2 = 0.733, p < 0.05). This may be linked to the production of oxygen, by benthic algae, resulting in the maintenance of an oxygenated layer at the sediment surface. Variation in labile P was best explained by overlying water temperature and equilibrium phosphate concentration (EPCO). (c) 2005 Elsevier Ltd. All rights reserved.
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