Spatial and Temporal Variations in Dissolved P Stream Concentrations for Wet and Dry Years

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Franklin, Dorcas H.
Steiner, Jean L.
Duke, S. E.
Moriasi, D. N.
Starks, P. J.
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Dissolved phosphorus (P) has often been identified as the nutrient of concern in lakes, reservoirs, and streams especially where there is evidence of eutrophication. We analyzed contiguous-spatial and temporal variability of dissolved P [soluble reactive P (SRP)] stream concentrations during times with drought and during times with a series of severe storms (2005 through 2009) in the Fort Cobb Reservoir watershed located in southwestern OK. The streams were sampled every two weeks (212 sampling dates) for SRP. Horizontal, longitudinal, and vertical biogeophysical metrics were compiled for each contributing area, within each stream reach, and from climate and precipitation data, respectively, and were related to SRP concentrations for spatially autocorrelated data and not spatially autocorrelated data. After a series of extreme rainfall events (drought to heavy rainfall) the proportion of spatial autocorrelation of stream SRP increased significantly (p < 0.05) as did the corresponding mean stream concentration of SRP.
Sponsored by: Georgia Environmental Protection Division U.S. Geological Survey, Georgia Water Science Center U.S. Department of Agriculture, Natural Resources Conservation Service Georgia Institute of Technology, Georgia Water Resources Institute The University of Georgia, Water Resources Faculty
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