Characteristics and Influence of Phosphorus Accumulated in the Bed Sediments of a Stream Located in an Agricultural Watershed |
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| Authors: | Adam R Hoffman David E Armstrong Richard C Lathrop Michael R Penn |
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| Institution: | (1) Environmental Chemistry and Technology, University of Wisconsin-Madison, 660 North Park St, Madison, WI 53706, USA;(2) Present address: Department of Applied and Natural Sciences, University of Dubuque, 2000 University Ave., Dubuque, IA 52001, USA;(3) Wisconsin Department of Natural Resources, Madison, WI 53707, USA;(4) Center for Limnology, University of Wisconsin-Madison, Madison, WI 53706, USA;(5) Civil and Environmental Engineering, University of Wisconsin-Platteville, Platteville, WI 53818, USA |
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| Abstract: | We investigated the accumulation and influence of bioavailable P (BAP) in sediments of a stream located in an agricultural
area of the Lake Mendota watershed in Wisconsin, USA. During hydrologic events, the stream carried high concentrations of
suspended sediment (up to 250 mg/l) and BAP (up to 2.5 mg/l). Bed sediments were highly enriched in BAP, as inventories of
BAP in the top 10 cm of sediment ranged from 143 to 14,500 μg P/cm2. Space variations in BAP inventories were related to site-specific hydrodynamics and geochemical factors, including iron
(Fe; r
2 = 0.71) and aluminum (Al; r
2 = 0.54) concentrations. Most sites behaved as potential sinks for dissolved reactive phosphate during hydrologic events and
potential sources during base-flow periods. Through the combination of site-specific factors and geochemical controls, Dorn
Creek modifies the amount, timing, and composition of P delivered from the watershed to downstream sites and water bodies. |
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| Keywords: | Agricultural watersheds Bioavailable phosphorus Phosphorus Sediment Equilibrium phosphorus concentrations |
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