Phosphorus release from coastal Baltic Sea sediments as estimated from sediment profiles
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
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.
Phosphorus, sediment, release, burial, Baltic Sea
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-69445DOI: 10.1016/j.ecss.2010.12.020ISI: 000289820700012OAI: oai:DiVA.org:su-69445DiVA: diva2:477800
authorCount :42012-01-132012-01-122012-01-13Bibliographically approved