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- W2007097103 abstract "Soil erosion, in the form of transported suspended sediment in overland flow, is often associated with high rates of particulate phosphorus (PP) (total P>0.45 μm) transfer from land to watercourses. Particulate P may provide a long-term source of P for aquatic biota. Twenty-two sites for winter overland flow monitoring were selected in south-west England within fields ranging from 0.2–3.8 ha on conventionally-managed arable land. Fields were situated on highly porous, light textured soils, lacking impermeable horizons and often overlying major aquifers. Long arable use and modern cultivation methods result in these soils capping under rain impact. Overland flow was observed when rainfall intensity approached the modest rate of 0.8 mm hr −1 on land at or near to field capacity. Low intensity rainfall ( −1 ) produced mean suspended sediment losses of 14 kg ha −1 hr −1 , with associated PP transfer rates of 16 g ha −1 hr −1 . In high intensity rainfall (>9 mm hr −1 ) mean PP losses of 319 g ha −1 hr −1 leaving the field were observed. As might be expected, there was a good relationship between PP and suspended sediment transfer in overland flow leaving the sites. The capacity of light soils to cap when in arable use, combined with heavy or prolonged rainfall, resulted in substantial discharges, soil erosion and associated PP transfer. Storms with heavy rain, typically of only a few hours duration, were characterised by considerable losses of PP. Such events, with return periods of once or twice a winter, may account for a significant proportion of total annual P transfer from agricultural soils under arable crops. However, contributions from less intense rain with much longer duration (around 100 hours per winter in many arable districts of the UK) are also demonstrated here." @default.
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- W2007097103 date "1999-01-01" @default.
- W2007097103 modified "2023-10-11" @default.
- W2007097103 title "The effect of rainfall intensity on soil erosion and particulate phosphorus transfer from arable soils" @default.
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- W2007097103 doi "https://doi.org/10.1016/s0273-1223(99)00316-9" @default.
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