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Published in J Environ Qual 27:267-277 (1998)
© 1998 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Hydrologic Controls on Phosphorus Loss from Upland Agricultural Watersheds

William J. Gburek* and Andrew N. Sharpley

Pasture Systems and Watershed Management Research Laboratory, USDA-ARS, University Park, PA 16802.

* Corresponding author (wjg1{at}psu.edu).

ABSTRACT

Development of strategies for controlling P loss from upland agricultural watersheds requires an ability to identify specific source areas of P at field and farm scales, and to predict their resultant effects at the watershed scale. Key to identification of P source areas is defining the interaction between P availability over the landscape and its potential for movement to the watershed outlet by runoff and erosion. A current weakness in quantifying this interaction is determining specific zones of runoff and erosion within a watershed, that is, source areas for the P transport mechanisms. Research results from a series of studies within a small, upland agricultural watershed in east-central Pennsylvania show that the zones of runoff production, and consequently the areas ultimately controlling most P transport, are often a limited and identifiable portion of the landscape. Quantifying the hydrologic controls on P transport within and from a watershed in this way allows us to focus management options on small and definable portions of the total watershed that contribute most export.

Received for publication February 7, 1997.


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