Details

Autor(en) / Beteiligte

• JOHANSSON, A. E
• KLEMEDTSSON, A. Kasimir
• KLEMEDTSSON, L
• SVENSSON, B. H

Titel

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

Ist Teil von

• Tellus. Series B, Chemical and physical meteorology, 2003-07, Vol.55 (3), p.737-750

Ort / Verlag

Oxford: Blackwell

Erscheinungsjahr

2003

Quelle

Wiley Online Library Database Model

Beschreibungen/Notizen

• Static chamber measurements of N sub(2)O 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 N sub(2)O fluxes, which ranged from consumption at -350 to emissions at 1791 kg N sub(2)O m super(-2) h super(-1). The largest positive flux occurred in October 1999 and the lowest in the middle of July 1999. The average N sub(2)O flux for the two years was 130 kg N sub(2)O m super(-2) h super(-1) (SD = 220). No significant differences in N sub(2)O 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 N sub(2)O. Consumption occurred on a few occasions at most measurement sites and ranged from 1-350 kg N sub(2)O m super(-2) h super(-1). 13-43% of the variation in N sub(2)O fluxes was explained by multiple linear regression analysis including principal components. Emission factors were calculated according to IPCC methods from the N sub(2)O 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 N sub(2)O fluxes from constructed wastewater-treating wetlands.