Phosphorus release from coastal Baltic Sea sediments as estimated from sediment profiles
Phosphorus release from coastal Baltic Sea sediments as estimated from sediment profiles
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DOI：
10.1016/j.ecss.2010.12.020
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发表时间：
2011-03
影响因子：
2.8
通讯作者：
E. Rydin;J. M. Malmaeus;O. M. Karlsson;P. Jonsson
中科院分区：
文献类型：
--
作者：
E. Rydin;J. M. Malmaeus;O. M. Karlsson;P. Jonsson
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/m2were 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/m2yr 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.
