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Title:   Author  item
                                            Walthall, Charlesitem
                                            Gish, Timothyitem
                                            Daughtry, Craigitem
                                            Dulaney, Wayneitem
                                            KUNG, K. - UNIVERSITY OF WIitem
                                            MCARTY, G. - USDA-ARS ALTERNATE CROPSitem
                                            TIMLIN, D. - USDA-ARS ALTERNATE CROPSitem
                                            Angier, Jonathanitem
                                            BUSS, P. - SENTEK PTY, KENT TOWNitem
                                            HOUSER, P. - NASA
  Submitted to: Nitrogen Environment and People Conference Proceedings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/14/2001
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract:  Fundamental watershed-scale processes governing chemical flux to neighboring ecosystems are so poorly understood that effective strategies for mitigating chemical contamination cannot be formulated. Characterization of evapotranspiration, surface runoff, plant uptake, subsurface preferential flow, behavior of the chemicals in neighboring  ecosystems and an understanding of how crop management practices influence the processes are needed. Adequate characterization of subsurface flow has been especially difficult because conventional sampling methods are ineffective for measuring preferential flow of water and solutes. A sampling strategy based on ground penetrating radar mapping of subsurface structures coupled with near-real time soil moisture data, surface topography, remotely sensed imagery and a geographic information system appear to offer a means of accurately identifying subsurface preferential  flow pathways. Four small adjacent watersheds draining into a riparian wetland and first order stream at the USDA-ARS Beltsville Agricultural Research Center, Beltsville, Maryland are being studied with this protocol. The spatial location of some of the preferential flow pathways for chemicals exiting these agricultural watersheds to the neighboring ecosystems have been identified. These results will be presented with a description of the broader objectives of the experiments at the site.


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