Phosphorus Storage in Fine Channel Bed Sediments |
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Authors: | Deborah J Ballantine Desmond E Walling Adrian L Collins Graham J L Leeks |
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Institution: | (1) Department of Geography, University of Exeter, Exeter, EX4 4RJ, UK;(2) Centre for Ecology and Hydrology, Wallingford, Oxfordshire, OX10 8BB, UK;(3) SEPA, Carseview House, Castle Business Park, Stirling, FK9 5AD, Scotland |
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Abstract: | Deposition and storage of fine sediment on channel beds represents an important component of a catchment’s sediment budget
and can have important implications for sediment-associated P fluxes, due to storage and remobilisation, and for P concentrations
through water–sediment interactions. Spatial and temporal variations in P content and storage in fine bed sediment have been
studied in two UK lowland catchments, the Rivers Frome and Piddle in Dorset. Fine bed sediment was sampled in representative
reaches on a bi-monthly basis using a re-suspension cylinder, and the resulting samples were analysed for total P, a range
of P fractions and particle size. The results demonstrate significant spatial and temporal variability in PP concentrations
and storage, with maximum and minimum P concentrations and storage occurring in late summer and winter, respectively. Temporal
variations in concentrations reflect residence times of the sediment and ambient P concentrations, while variations in storage
are mainly due to hydrological regimes. Spatial variations reflect catchment characteristics, the location of inputs and local
variations in hydrological and channel bed conditions. |
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Keywords: | bed sediment phosphorus storage study area UK |
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