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Phosphorus release from coastal Baltic Sea sediments as estimated from sediment profiles
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Akvatisk miljöanalys)
2011 (English)In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 92, no 1, 111-117 p.Article in journal (Refereed) Published
Abstract [en]

We used the decline in total phosphorus (P) concentration with depth in sediment profiles from the North-western Baltic Proper coastal zone to calculate the site-specific amount of sediment P eventually to be released to the water column: The potentially mobile P. P fractionation revealed that iron bound P dominated the potentially mobile P at sites with oxic surface sediment layers. Organic P forms were also a major constituent of the potentially mobile P pool. We determined that 1-7 g P/m(2) were potentially mobile at our sites, and the turnover time of this P pool was considered short, i.e., less than a decade. To determine long-term average P fluxes to and from the surface sediment layer, we first multiplied the constant and relatively low P concentration in deeper sediment layers with the sediment accumulation rate to gain the P burial rate. Then the average total P concentration in settling matter was multiplied with the sediment accumulation rate to estimate the depositional P flux at each site. The difference between the depositional and burial rates represents the long-term average release rate of sediment P and varied between 1.0 and 2.7 g P/m(2) yr among our sites. These rates are at the same order of magnitude as values reported from other areas of the Baltic Sea, and constitute a major source of P to the water column.

Place, publisher, year, edition, pages
2011. Vol. 92, no 1, 111-117 p.
Keyword [en]
phosphorus, release, burial, Baltic Sea
National Category
Research subject
Earth Science with specialization in Environmental Analysis
URN: urn:nbn:se:uu:diva-148236DOI: 10.1016/j.ecss.2010.12.020ISI: 000289820700012OAI: oai:DiVA.org:uu-148236DiVA: diva2:401600
Available from: 2011-03-03 Created: 2011-03-03 Last updated: 2011-05-16Bibliographically approved

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