An experiment with forced oxygenation of the deepwater of the anoxic By Fjord, western Sweden
Journal article, 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

Author

Anders Stigebrandt

University of Gothenburg

Bengt Liljebladh

University of Gothenburg

L. De Brabandere

M Forth

Åke Granmo

Per Hall

University of Gothenburg

J Hammar

Daniel Hansson

University of Gothenburg

Mikhail Kononets

University of Gothenburg

M Magnusson

F Norén

L Rahm

A Treusch

Lena Viktorsson

University of Gothenburg

Ambio

0044-7447 (ISSN)

Vol. 44 1 42-54

Subject Categories

Earth and Related Environmental Sciences

DOI

10.1007/s13280-014-0524-9

More information

Created

10/10/2017