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Johanna Stadmark

Johanna Stadmark

Researcher

Johanna Stadmark

Emissions of greenhouse gases from ponds constructed for nitrogen removal

Author

  • Johanna Stadmark
  • Lars Leonardson

Summary, in English

Methane and carbon dioxide emission from three constructed ponds were monitored during an annual cycle. Water temperature was a good predictor of methane emission in all three ponds. In the most intensively studied pond, nitrate concentration in the bottom water could further explain the amount of methane emitted. When water temperature exceeded 15 °C between 1 and 54 mg, CH4 m−2 h−1 was emitted on all occasions, while at temperatures below 10 °C, less than 0.6 mg CH4 m−2 h−1 was emitted. The flux of carbon dioxide differed between the ponds and no consistent patterns were found. In a laboratory study at 20 °C, we showed that high, but naturally occurring, nitrate concentrations (8 and 16 mg NO3−–N l−1) constrained the production of methane compared to the treatment with no nitrate addition. Nitrous oxide production was positively correlated with nitrate concentration. Carbon dioxide production was highest at the highest nitrate concentration, which indicates that increased nitrate loading on ponds and wetlands will stimulate organic matter decomposition rates. Our conclusion is that these ponds constructed for nitrate removal emit greenhouse gases comparable to lakes in the temperate region.

Department/s

  • Department of Biology
  • Division aquatic ecology

Publishing year

2005

Language

English

Pages

542-551

Publication/Series

Ecological Engineering: the Journal of Ecotechnology

Volume

25

Issue

5

Document type

Journal article

Publisher

Elsevier

Topic

  • Ecology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1872-6992