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Scholars Day 2008, Wednesday, April 9

Phosphorus Transformations From Field Soils to Lake Sediments

Phosphorus has been identified as one of the major factors influencing the anthropogenic eutrophication of surface waters. In this study, we investigated the transformation of phosphorus species as soil is eroded, transported through a stream, and ultimately deposited in a near-shore sedimentary environment. Conesus Lake, located in Livingston County, New York, has several small sub-watersheds entering around the perimeter of the lake. Graywood Creek is a small watershed, comprising approximately 38 hectares, and dominated by a single dairy farm. Soil samples were collected from six different agricultural fields based on current and past management practices and one forest soil within the watershed. Stream sediment was collected in three shallow pools within the stream, and seven sediment samples were collected within the near-shore area of the lake. These samples were subjected to a sequential extraction procedure (Psenner, 1988) that operationally separates P into five physicochemical phases, pore solution and easily exchangeable, associated with Fe and Mn oxyhydroxides, associated with Al oxyhydroxides, associated with organic matter, and Ca associated P.

Presenter: Aimee Szatkowski (Undergraduate Student)
Topic: Earth Science
Location: Fireside Lounge, Seymour Union
Time: 11 am (Session II)