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

B.M. Spears, L. Carvalho, R. Perkins, A. Kirika, David Maxwell Paterson

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51 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)383-391
Number of pages9
JournalWater Research
Volume40
DOIs
Publication statusPublished - Jan 2006

Keywords

  • sediment
  • phosphorus
  • mobility
  • composition
  • bio-regulation
  • eutrophication
  • LOCH-LEVEN
  • WATER INTERFACE
  • RELEASE
  • PHYTOPLANKTON
  • EXCHANGE
  • SCOTLAND
  • KINROSS

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