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Nitrous oxide exchanges with the atmosphere of a constructed wetland treating wastewater - Parameters and implications for emission factors

Artikel i vetenskaplig tidskrift
Författare A. E. Johansson
Åsa Kasimir Klemedtsson
Leif Klemedtsson
B. H. Svensson
Publicerad i Tellus Series B-Chemical and Physical Meteorology
Volym 55
Nummer/häfte 3
Sidor 737-750
ISSN 0280-6509
Publiceringsår 2003
Publicerad vid Institutionen för geovetenskaper
Botaniska institutionen
Sidor 737-750
Språk en
Länkar <Go to ISI>://000184137700001
Ämneskategorier Biologiska vetenskaper


Static chamber measurements of N2O fluxes were taken during the 1998 and 1999 growth seasons in a Swedish constructed wetland receiving wastewater. The dominating plant species in different parts of the wetland were Lemna minor L., Typha latifolia L., Spirogyra sp. and Glyceria maxima (Hartm.) and Phalaris arundinacea (L.), respectively. There were large temporal and spatial variations in N2O fluxes, which ranged from consumption at -350 to emissions at 1791 mug N2O m(-2) h(-1). The largest positive flux occurred in October 1999 and the lowest in the middle of July 1999. The average N2O flux for the two years was 130 mug N2O m(-2) h(-1) (SD = 220). No significant differences in N2O fluxes were found between the years, even though the two growing seasons differed considerably with respect to both air temperature and precipitation. 15% of the fluxes were negative, showing a consumption of N2O. Consumption occurred on a few occasions at most measurement sites and ranged from 1-350 mug N2O m(-2) h(-1). 13-43% of the variation in N2O fluxes was explained by multiple linear regression analysis including principal components. Emission factors were calculated according to IPCC methods from the N2O fluxes in the constructed wetland. The calculated emission factors were always lower (0.02-0.27%) compared to the default factor provided by the IPCC (0.75%). Thus, direct application of the IPCC default factor may lead to overestimation of N2O fluxes from constructed wastewater-treating wetlands.

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