Phosphorus Fractionation in Sediment Cores Collected In 2005 Before and After Onset of an Aphanizomenon flos-aquae Bloom in Upper Klamath Lake, OR, USA
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We tested the hypothesis that there would be measurable losses of phosphorus (P) from surficial sediments of Upper Klamath Lake (UKL), Oregon, if sediments were a source of P during an algal bloom. We compared concentrations of total and forms of P at various depths in cores collected before and after the onset of a large Aphanizomenon flos-aquae bloom. Concentrations of inorganic P were determined in extraction solutions of MgCl2 (1 M, pH 8), citrate-dithionite-bicarbonate, and 1 M HCl. Sediments below 2 cm were dominated by residual P which is defined as total P minus inorganic P. During the study period, data from the top 2-cm of sediment indicated (a) significant decrease in total P concentration, primarily associated with iron oxyhydroxides at one site, and (b) significant increase in total P concentration associated with residual P at a second site. Data from two other sites indicated no net changes in concentrations of total P.
KeywordsPhosphorus fractionation Residual phosphorus Cyanophyte Eutrophic Shallow lake Metals
The authors greatly appreciate the excellent support of the U.S. Geological Survey Klamath Falls Field Office field crew and the helpful suggestions of James Kuwabara and Thomas Kraemer, both from the U.S. Geological Survey.
The authors gratefully acknowledge the financial support of the U.S. Bureau of Reclamation for part of the project. s.d.g. Any use of trade, product, or firm names in this report is for identification purposes only and does not constitute endorsement by the U.S. Government.
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