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Phosphorus dynamics and productivity in sewage-impacted lowland chalk stream

Palmer-Felgate, Elizabeth J.; Jarvie, Helen P.; Williams, Richard J.; Mortimer, Robert J.G.; Loewenthal, Matthew; Neal, Colin. 2008 Phosphorus dynamics and productivity in sewage-impacted lowland chalk stream. Journal of Hydrology, 351 (1-2). 87-97. 10.1016/j.jhydrol.2007.11.036

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Abstract/Summary

Hourly in situ phosphorus, conductivity, turbidity, dissolved oxygen, pH, and chlorophyll measurements were collected from January 2004 to November 2006 for the River Kennet, 2 km downstream of a sewage effluent inlet. Excess carbon dioxide pressure (EpCO2) was calculated from continuous pH and spot alkalinity measurements. EpCO2 and dissolved oxygen were used to estimate rates of photosynthesis and respiration. These parameters were examined alongside flow, water temperature and solar radiation to explore controls on phosphorus dynamics and in-stream productivity. Diurnal, event and seasonal patterns were observed in phosphorus concentrations. The diurnal and seasonal variations appeared to be related to the upstream sewage treatment works. The event patterns coincided with periods of high flow, and were attributed to diffuse sources. Chlorophyll behaved independently of phosphorus concentration and returned to baseline levels before photosynthesis rate. This indicated that, during the period of study, in-stream productivity was primarily controlled by aquatic plants other than phytoplankton.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.jhydrol.2007.11.036
Programmes: CEH Programmes pre-2009 publications > Water > WA02 Quantifying processes that link water quality and quantity, biota and physical environment
CEH Sections: Acreman
Boorman
ISSN: 0022-1694
Additional Keywords: Phosphoru, River Kennet, Chlorophyll, Continuous measurements, High-resolution
NORA Subject Terms: Ecology and Environment
Hydrology
Chemistry
Date made live: 05 May 2009 11:31
URI: http://nora.nerc.ac.uk/id/eprint/5518

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