nerc.ac.uk

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

Spears, Bryan; 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.2005.11.013

Full text not available from this repository.

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): 10.1016/j.watres.2005.11.013
Programmes: CEH Programmes pre-2009 publications > Water
CEH Sections: _ 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
URI: http://nora.nerc.ac.uk/id/eprint/471

Actions (login required)

View Item View Item