Longitudinal and Seasonal Patterns of Phosphorus in Riverbed Sediments
Seasonal variability in particulate phosphorus (P) was characterized in riverbed sediment along the longitudinal gradient of an agricultural watershed in southern Ontario. Particulate P forms, nonapatite P (NAIP), apatite P (AP) and organic P (P), were determined by sequential extraction. Increased concentrations of NAIP and OP in fine-grained sediment ( 63 mu m) in upper reaches of the watershed are attributed to agricultural activity in the watershed. From a management perspective, this study provides a locational focus for P abatement programmes where a combination of traditional best management practices and improved nutrient management practices should be targeted.
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