Tuesday, November 14, 2006

Phosphorus Transport in a Ditch-drained Agroecosystem During Two Large Stormflow Events.

Skye Wills1, Brian A. Needelman1, Peter J.A. Kleinman2, and Arthur L. Allen3. (1) Univ of Maryland, 9604 49th Pl., College Park, MD 20740, (2) USDA-ARS-Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Rd., University Park, PA 16802-3702, (3) Univ of Maryland, Eastern Shore, 30921 Martin Ct, Crop and Aquaculture Bldg, Princess Anne, MD 21853

Long-term poultry litter applications have resulted in soils with high phosphorus concentrations in the Delmarva Peninsula. In this study, we examine the dynamics of surface and subsurface phosphorus transport pathways from agricultural fields to drainage ditches and through a ditch network during two large stormflow events. The study was conducted on the University of Maryland Eastern Shore Research Farm as part of a larger study investigating the management of ditches to improve water quality in local streams and estuaries. Water quality was monitored at surface flumes, in shallow wells and piezometers, and at in-ditch flumes. Additional data include field and ditch soil characterization and ditch water dissolved oxygen and pH. We will discuss the dominant hydrological pathways during these major events and geomorphic and biogeochemical factors controlling phosphorus transport in this landscape.  

Handout (.pdf format, 398.0 kb)