Factors controlling phosphorus release from sediments in coastal archipelago areas

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Irma Puttonen, Tuula Kohonen, Johanna Mattila
Förläggare: Elsevier
Publiceringsår: 2016
Tidskrift: Marine Pollution Bulletin
Volym: 108
Nummer: 1-2
Artikelns första sida, sidnummer: 77
Artikelns sista sida, sidnummer: 86
eISSN: 1879-3363


Abstrakt

In coastal archipelago areas of the northern Baltic Sea, significantly higher phosphate concentrations (6.0 ±
4.5 μmol/l, mean ± SD) were measured in water samples close to the sediment surface compared with those
from 1 m above the seafloor (1.6± 2.0 μmol/l). The results indicated notable phosphate release from sediments
under the bottom water oxygen concentrations of up to 250 μmol/l, especially in areas that had experienced recent
temporal fluctuation between oxic and hypoxic/anoxic conditions. No single factor alone was found to control
the elevated PO4-P concentrations in the near-bottom water. In addition to the oxygen in the water, the
contents of potentially mobile phosphorus fractions, grain-size, the organic content at the sediment surface,
and the water depth were all important factors controlling the internal loading of phosphorus. The complexity
of this process needs to be accounted for in assessments of the internal loading of phosphorus and in potential
mitigation plans.
In coastal archipelago areas of the northern Baltic Sea, significantly higher phosphate concentrations (6.0 ±
4.5 μmol/l, mean ± SD) were measured in water samples close to the sediment surface compared with those
from 1 m above the seafloor (1.6± 2.0 μmol/l). The results indicated notable phosphate release from sediments
under the bottom water oxygen concentrations of up to 250 μmol/l, especially in areas that had experienced recent
temporal fluctuation between oxic and hypoxic/anoxic conditions. No single factor alone was found to control
the elevated PO4-P concentrations in the near-bottom water. In addition to the oxygen in the water, the
contents of potentially mobile phosphorus fractions, grain-size, the organic content at the sediment surface,
and the water depth were all important factors controlling the internal loading of phosphorus. The complexity
of this process needs to be accounted for in assessments of the internal loading of phosphorus and in potential
mitigation plans.


Nyckelord

Archipelago Sea, Baltic Sea, coastal eutrophication, Hypoxia, sediment phosphorus dynamics, Water quality


Dokument


Senast uppdaterad 2020-29-09 vid 03:04