title: Screening risk areas for sediment and phosphorus losses to improve placement of mitigation measures.
abstract: Identification of vulnerable arable areas to phosphorus (P) losses is needed to effectively implement mitigation measures. Indicators for source (soil test P, STP), potential mobilization by erosion (soil dispersion), and transport (unit-stream power length-slope, LS) risks were used to screen the vulnerability to suspended solids (SS) and P losses in two contrasting catchments regarding topography, soil textural distribution, and STP. Soils in the first catchment ranged from loamy sand to clay loam, while clay soils were dominant in the second catchment. Long-term SS and total P losses were higher in the second catchment in spite of significantly lower topsoil STP. A higher proportion of areas in the second catchment were identified with higher risk due to the significantly higher risk of overland flow generation (LS) and a significantly higher mobilization risk in the soil dispersion laboratory tests. A simple screening method was presented to improve the placement of mitigation measures.
authors.affiliation: Department of Soil and Environment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, P.O. Box 7014, 75007, Uppsala, Sweden. ana.villa@slu.se.
authors.forename: Ana
authors.initials: A
authors.lastname: Villa
authors.affiliation: Department of Soil and Environment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, P.O. Box 7014, 75007, Uppsala, Sweden. faruk.djodjic@slu.se.
authors.forename: Faruk
authors.initials: F
authors.lastname: Djodjic
authors.affiliation: Department of Soil and Environment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, P.O. Box 7014, 75007, Uppsala, Sweden. lars.bergstrom@slu.se.
authors.forename: Lars
authors.initials: L
authors.lastname: Bergström
authors.affiliation: Department of Soil and Environment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, P.O. Box 7014, 75007, Uppsala, Sweden. katarina.kyllmar@slu.se.
authors.forename: Katarina
authors.initials: K
authors.lastname: Kyllmar
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D019015:Geologic Sediments / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D018570:Risk Assessment; D012989:Soil Pollutants / Q000032:analysis*; D013548:Sweden; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: Critical source areas; Erosion; Phosphorus; Risk screening