Spatial and historical variation in sediment phosphorus fractions and mobility in a large shallow lake
Spears, B. M.; Carvalho, L.; Perkins, R.; Kirika, A.; Paterson, D. M.. 2006 Spatial and historical variation in sediment phosphorus fractions and mobility in a large shallow lake. Water Research, 40. 383-391. 10.1016/j.watres.2005.11.013Full text not available from this repository.
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 4 m 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 (R2=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 (EPC0).
|Item Type:||Publication - Article|
|Digital Object Identifier (DOI):||10.1016/j.watres.2005.11.013|
|Programmes:||CEH Programmes pre-2009 publications > Water|
|CEH Sections:||_ Scottish Freshwater Ecosystem|
|Format Availability:||Electronic, Print|
|Additional Keywords:||Sediment, Phosphorus, Mobility, Composition, Bio-regulation, Eutrophication, loch leven|
|NORA Subject Terms:||Hydrology|
|Date made live:||28 Jun 2007 13:25|
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