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Phosphorus Export from an Agricultural Watershed

Linking Source and Transport Mechanisms

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

View larger version (85K): [in a new window]   Fig. 1. Location, topography, soil types (grey = Typic Dystrochrept, white = Typic Fragiudult), and instrumentation of Watershed FD-36, Pennsylvania. Letters refer to grab samples taken in October 2000.

View larger version (26K): [in a new window]   Fig. 2. Saturated distance from the stream for each segment for storms that occurred from August to November 1996 (data from Sharpley et al., 1999). The dashed line shows the saturated distance within which 90% of the storms influenced.

View larger version (29K): [in a new window]   Fig. 3. Dissolved reactive P lost in overland flow during a 30-min event for a Typic Fragiudult and Typic Dystrochrept soil. Bars represent percent clay in overland flow collected for the Typic Fragiudult soil.

View larger version (36K): [in a new window]   Fig. 4. The distribution of Mehlich-3 extractable P and the relative erosion potential within the watershed. Yellow lines refers to field boundaries, red to watershed segments, blue to stream channel and green to 30 m from stream channel.

View larger version (22K): [in a new window]   Fig. 5. Sorption isotherms for a Typic Fragiudult and Typic Dystrochrept soil of similar total P concentrations.

View larger version (22K): [in a new window]   Fig. 6. Sorption isotherms for each flume sediment sample fitted to the Langmuir equation.

View larger version (26K): [in a new window]   Fig. 7. Desorption of P at different sediment to water ratios with time for each flume sediment.