Spatial and historical variation in sediment phosphorus fractions and mobility in a large shallow lake

Spears, Bryan ORCID: https://orcid.org/0000-0002-0876-0405; 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. https://doi.org/10.1016/j.watres.2005.11.013

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Abstract/Summary

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):	https://doi.org/10.1016/j.watres.2005.11.013
Programmes:	CEH Programmes pre-2009 publications > Water
UKCEH and CEH Sections/Science Areas:	_ Scottish Freshwater Ecosystem
ISSN:	0043-1354
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 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/471

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