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The exchange of phosphorus between riparian wetland sediments, pore water and surface water

Research output: Contribution in Book/Report/ProceedingsChapter

Published

Publication date2005
Host publicationDynamics and Biogeochemistry of River corridors and Wetlands
EditorsL Heathwaite, B Webb, D Rosenberry, D Weaver, M Hayash
Place of publicationWallingford
PublisherIAHS Publications
Pages37-45
Number of pages9
ISBN (Print)1-901502-03-1
Original languageEnglish

Abstract

Phosphorus (P) is generally viewed as the main element driving eutrophication risk in freshwaters. In this paper we examine the release of P from riparian wetland sediments to pore water and surface water. The research was conducted at Strumpshaw Fen in the Norfolk Broads region of the UK. We show that substantial quantities of bioavailable P may be released into solution from the sediments at Strumpshaw Fen. This release is physicochemically controlled, and involves the reductive-dissolution of P complexed at the surface of ferric hydroxide. Maximum concentrations of molybdate-reactive P (MRP) in 0.45 m m filtered solutions can reach up to 1 mg l-1 P in surface water, and up to 4.5 mg l-1 P in pore water. Such high concentrations of MRP indicate that riparian wetlands may act as sources of P with the potential to threaten the chemical and ecological quality of receiving water bodies.

Bibliographic note

The exchange of phosphorus between riparian wetland sediments, pore water and surface water