Assessments of Potential Spatial-temporal Variations in Phosphorus Distribution and Fractionation in River Bed Sediments

作者：Wang Jingyu^*; Pant Hari K

来源：Clean-Soil Air Water, 2011, 39(2): 148-156.

DOI：10.1002/clen.201000088

• Microbial P
• Mineralization
• NaHCO(3)-P
• NaOH-P
• P distribution
• P pool

Sediment characteristics influence the distribution and bioavailability of phosphorus (P) in river sediments. In this study, we analyzed different P fractions in the sediments of the Bronx River, New York City, NY, using sequential extraction. The results showed that the average P pool rank order was HCl-P > NaOH-P > NaHCO(3)-P > residue-P, and their relative proportions were 3.7: 2.0: 1.4: 1 in sediments collected in 2006, while HCl-P > NaOH-P > residue-P > NaHCO(3)-P, with their relative proportions of 27.8:6.2:2.7:1 in the sediments obtained in 2007. The strong correlation between microbial P and organic P (OP), along with the changes in microbial P over time indicate that most of the OP in the river bed sediments is potentially bioavailable. The sediment transport, deposition, assimilation, the exchange of P between sediments and water columns, the land use changes, raw sewer discharge, gas spill, construction, fertilizer application, etc., as well as the hydro-climatic changes could result in the spatial and temporal variations in P bioavailability in the river bed sediments. The estimations of P pools and their bioavailability in river bed sediments could help determine the spatial and temporal variations in P transport and impacts of land use on water quality, in turn, help regulate P in the river's watershed.

• 出版日期2011-2