Relationship Between the Sediment Geochemistry and Phosphorus Fluxes in a Great Lakes Coastal Marsh,Cootes Paradise,ON, Canada |
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Authors: | T Mayer F Rosa R Mayer M Charlton |
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Institution: | (1) Environment Canada, 867 Lakeshore Rd., Burlington, ON, L7R 4A6, Canada;(2) 74 Resurrection Rd., Toronto, M9A 5H1, Canada |
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Abstract: | Cootes Paradise is a coastal wetland, adjacent to Hamilton Harbour at the western tip of Lake Ontario. The marsh has been
considerably degraded due to the excessive sediment and nutrient input from sewage treatment plants (STPs), marsh tributaries
and Combined Sewer Overflows (CSOs). Although there has been reduction in nutrient loadings from external sources, high nutrient
levels, and a prolific algal growth remain a problem in Cootes Paradise. To assess the importance of external versus internal nutrient loadings to the marsh, nutrient fluxes from sediments were estimated using porewater profiles at three
locations from 2001 and five additional sites from 2002. The fluxes varied between 0.27 and 5.25 mg P m−2 day−1, with sites receiving outfalls of STP and CSO having highest fluxes (∼5 mg P m−2 day−1). Mean phosphorus release rate of 2.02 mg P m−2 day−1 was calculated from the spatial distribution of the non-apatite inorganic phosphorus (NAI-P) in sediments, employing a relationship
between the NAI-P and P fluxes. The results confirm that sediment P geochemistry is important in regulating the P pool in
porewater which, consequently, governs the P fluxes from sediments. |
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Keywords: | phosphorus fluxes sediments porewater wetlands |
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