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.
10.1016/j.watres.2005.11.013
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 |
| 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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