Spatial and Temporal Relationships of Bioavailable and Dissolved P Stream Concentrations: II.

Bioavailable and dissolved phosphorus have often been identified as the nutrient of interest in lakes and streams with water assessments for eutrophicaltion.  In the Fort Cobb watershed we analyzed the spatial and temporal variability of biovailable P (BAP) and dissolved P (PO4) stream concentrations during times with drought and a series of severe storms (2005 through 2009).  The streams were sampled every two weeks (212 sampling dates) for BAP, PO4, pH, oxidation reduction potential and precipitation was record.  After a series of extreme rainfall events (drought to heavy rainfall) the proportion of spatial autocorrelation increased significantly for PO4 but not for BAP.  While precipitation did not appear to be correlated to this shift other indices such as DO and oxidation reduction potential experienced similar shifts.