『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.

Keywords: Phosphorus; Sediments; Patuxent river; Chesapeake bay; Citrate dithionite bicarbonate (CDB)』

Introduction
Study location
Methods
　Sediment and pore water collection
　Chemical analyses
　Sediment characterization
　²¹⁰Pb dating
Results
　Spatial variability of PP fractions
　Spatial trends in CDB extractable Fe (CDB-Fe)
　Sediment characterization
　²¹⁰Pb dating
　Pore water solutes
Discussion
　The fate of PP entering the upper Patuxent River subestuary
　　P burial rates
　　P burial in subtidal and marsh sediments
　　P budget for the Patuxent
　　Historical P loading
　The Chemical forms of PP retained in the sediments
　　CDB-extractable P (Fe-P)
　　Organic-P
　　Authigenic CFA
Summary
Acknowledgements
References

※リンの連続抽出には、Ruttenberg（1992）のSEDEX法を修正したものを用いている。