An experiment with forced oxygenation of the deepwater of the anoxic By Fjord, western Sweden
Artikel i vetenskaplig tidskrift, 2015

In a 2.5-year-long environmental engineering experiment in the By Fjord, surface water was pumped into the deepwater where the frequency of deepwater renewals increased by a factor of 10. During the experiment, the deepwater became long-term oxic, and nitrate became the dominating dissolved inorganic nitrogen component. The amount of phosphate in the water column decreased by a factor of 5 due to the increase in flushing and reduction in the leakage of phosphate from the sediments when the sediment surface became oxidized. Oxygenation of the sediments did not increase the leakage of toxic metals and organic pollutants. The bacterial community was the first to show changes after the oxygenation, with aerobic bacteria also thriving in the deepwater. The earlier azoic deepwater bottom sediments were colonized by animals. No structural difference between the phytoplankton communities in the By Fjord and the adjacent Havsten Fjord, with oxygenated deepwater, could be detected during the experiment.

syresättning av fjordbassäng

ekologisk ingenjörskonst

återkolonisering av tidigare dör bassäng

syrefritt

Författare

Anders Stigebrandt

Göteborgs universitet

Bengt Liljebladh

Göteborgs universitet

L. De Brabandere

M Forth

Åke Granmo

Per Hall

Göteborgs universitet

J Hammar

Daniel Hansson

Göteborgs universitet

Mikhail Kononets

Göteborgs universitet

M Magnusson

F Norén

L Rahm

A Treusch

Lena Viktorsson

Göteborgs universitet

Ambio

0044-7447 (ISSN)

Vol. 44 42-54

Ämneskategorier

Geovetenskap och miljövetenskap

DOI

10.1007/s13280-014-0524-9