title: Dynamics of diffuse pollution from US southern watersheds.
abstract: To understand the effects of diffuse pollution information on the source of pollutants, quantities in transport, mode of transport, transient nature of the pollution event, and most importantly, a consideration of remediation efforts need to be known. For example, water quality research in the Yazoo Basin uplands in Mississippi has shown sediment loads from a conventional-till upland soybean watershed to be about 19,000kg/ha/yr, and responsible for 77-96% of P and N in transport. In contrast, sediment loads from a comparable no-till soybean watershed were only 500 kg/ha/yr. transporting about 31% of P and N in transport. Sediment loads from a nearby forested area were low, about 200 kg/ha/yr, but responsible for about 47-76% of P and N in transport. Transient pollution events are responsible for the transport of large quantities of sediment, nutrients, and pesticides; in some storm events nearly the annual load. Best management practices (BMPs) must be designed to remediate diffuse pollution and the transient nature of pollution events which can have a profound effect on the ecological health of steams and reservoirs.
authors.affiliation: USDA-ARS-National Sedimentation Laboratory, Oxford, MS 38655, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Schreiber
authors.forename: R A
authors.initials: RA
authors.lastname: Rebich
authors.forename: C M
authors.initials: CM
authors.lastname: Cooper
mesh_terms: D000383:Agriculture; D011232:Chemical Precipitation; D004058:Diffusion; D004463:Ecology; D004784:Environmental Monitoring; D016468:Forestry; D005618:Fresh Water / Q000032:analysis* / Q000737:chemistry; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010710:Phosphates / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012995:Solubility; D014481:United States; D014877:Water Pollution, Chemical / Q000032:analysis*
chemical_list: D009566:Nitrates; D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D010758:Phosphorus; D009584:Nitrogen