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Uptake and Release of Phosphorus from Overland Flow in a Stream Environment

R. W. McDowell* and A. N. Sharpley

USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802-3702



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  		Fig. 1. Location of WE-38 watershed and sampling sites.

 


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  		Fig. 2. Top and side-on views depicting one trough of the fluvarium. Three other troughs sit alongside. Diagram is not to scale.

 


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  		Fig. 3. Relationship between the dissolved reactive phosphorus (DRP) concentration at the end of the uptake phase of flow and the solution P concentration at which no net sorption or desorption of P occurs (EPC0) determined from batch sorption isotherms. The numbers in parentheses refer to sediment sites (Table 1).

 


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  		Fig. 4. Concentration pattern of P fractions during the uptake phase of flow.

 


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  		Fig. 5. Relationship between the decay rate parameter (ß) and the percent sand in each sediment. Numbers in parentheses refer to sediment sites (Table 1).

 


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  		Fig. 6. Concentration pattern of P fractions during the release or flushing phase of flow.

 




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