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Title: Factors contributing to the internal loading of phosphorus from anoxic sediments in six Maine, USA, lakes
Author(s): Lake, Bjorn A.; Kyle M. Coolidge; Stephen A. Norton; Aria Amirbahman
Year: 2007
Journal: Science of the Total Environment: 373 (2-3) : 534-541
Abstract:

Phosphorus (P) is the limiting macronutrient for primary production in most lakes. Seasonal anoxia in the hypolimnion of lakes has been strongly correlated with internal P loading to the water column. Gravimetric sediment cores were collected before and after the onset of anoxia in six Maine (USA) lakes during the summer of 2003. This study investigates the relative importance of P sequestration by aluminum hydroxide (Al(OH)3(s)), and ferric (oxy)hydroxide (Fe(OH)3(S)) dissolution with subsequent P release in lakes with varying trophic status. Two lakes, Pennesseewassee and Highland, are oligotrophic. The remaining lakes, China, Cobbosseecontee, Webber and Salmon, have varying levels of productivity. The results suggest that a sediment [NH4Cl–Al+BD–Al+NaOH25–Al]:[NH4Cl–Fe+BD–Fe] molar ratio N3 and a sediment [NaOH25–Al]:[NH4Cl–P+BD– P] molar ratio N25 predict low P flux from sediments during the development of anoxia, as proposed by Kopá ek et al. [Kopá ek J, Borovec J, Hejzlar J, Ulrich K, Norton S, Amirbahman A. Aluminum control of Phosphorus Sorption in Lake Sediments. Environ Sci Technol 2005; 39: 8784–8789.], despite the development of anoxia in and the release of Fe(II) from the hypolimnia of the two study lakes. However, when these molar ratios are not exceeded the model does not adequately describe sedimentary P flux. The application of the model proposed by Kopá ek et al. to Cobbosseecontee Lake suggests that its sediment may be a source of P to the water column. However, water column data indicate little to no sedimentary P flux. Therefore, the lack of P flux may be attributed to the absence of Fe (III) reduction in the Cobbosseecontee Lake sediment or perhaps to the slow diagenesis of organically-bound P.

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Core Keywords: Aluminum // Lake - Pond // Nutrients // Phosphorus // Soils - sediments // Trophic state // Water quality - quantity
Additional Keywords:
States/Provinces: ME
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