Total phosphorus concentrations and compaction in riparian areas under different riparian land-uses of Iowa

摘要: Abstract Reducing non-point source phosphorus (P) pollution is often necessary to improve water quality in agricultural streams. Soil total P (TP) concentrations and compaction are soil characteristics that can influence losses The objective of this study was compare these two among riparian forest buffers, grass filters, pastures with cattle fenced out the stream, intensive rotational, rotational continuously grazed row-cropped fields three physiographic regions Iowa. TP for seven land-uses were determined stream bank surface soils. Total bed material along also measured. soils ranged from 303 398 mg kg−1 central region, 432–518 mg kg−1 northeast, 360–555 mg kg−1 southeast. In 434 649 mg kg−1 493–764 mg kg−1 northeast 428–716 mg kg−1 southeast region. Finally, sediments 194–307 mg kg−1 169–461 mg kg−1 389–964 mg kg−1 Few significant differences within found. under some grazing practices significantly higher than conservation practices. Limited partially due young age pastures. Past land-use on sites had been either continuous or row-cropping those uses still influencing parameters. Within land-uses, generally Stream samples lower but Overall bank, high indicating areas potentially be important focus should reducing transport P.