Abstract
We used a sequential extraction technique and 210Pb dating to determine the chemical form and amount of particulate phosphorus (PP) that is retained during burial in 1-m-long sediment cores collected along a salinity gradient from tidal freshwater to the mesohaline waters of the Patuxent River, a subestuary of the Chesapeake Bay. PP buried in the study sites with salinity values ≤3 was similar in concentration and form to PP entering the Patuxent from the watershed, suggesting efficient sequestration by the sediments at these low-salinity sites. PP extracted with citrate–dithionite–bicarbonate was the dominant form of PP at all salinities and all depths, and organic-P was the second most abundant fraction. We estimated that 81% of PP entering from the watershed is trapped in the sediments of the upper Patuxent subestuary and that the subtidal sediments retain three times as much PP as the marshes adjacent to the study sites.
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Acknowledgements
Funding was provided by National Science Foundation grant DEB-0235884, and the US Environmental Protection Agency (EPA) Science to Achieve Results (STAR) Graduate Fellowship Program. Greg Foster generously provided lab space at George Mason University. Technical assistance was provided by Nancy Goff, Joseph Miklas, Marc Sigrist, Mike Owens, and Jonathan Chester. Help also came from George Mason University students Kim Cone and Jackie Nguyen. This paper was improved by valuable and constructive suggestions from Don Kelso, Greg Foster, and two anonymous reviewers.
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Hartzell, J.L., Jordan, T.E. & Cornwell, J.C. Phosphorus Burial in Sediments Along the Salinity Gradient of the Patuxent River, a Subestuary of the Chesapeake Bay (USA). Estuaries and Coasts 33, 92–106 (2010). https://doi.org/10.1007/s12237-009-9232-2
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DOI: https://doi.org/10.1007/s12237-009-9232-2