Temporal and seasonal changes in greenhouse gas emissions from a constructed wetland purifying peat mining runoff waters
| Autor: | Satu Maaria Karjalainen, Hannu Nykänen, Jari T. Huttunen, Anu Liikanen, Pertti J. Martikainen, Kaisa Heikkinen, Tero Väisänen |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
geography
Environmental Engineering geography.geographical_feature_category Peat Environmental engineering chemistry.chemical_element Biomass Wetland Management Monitoring Policy and Law Methane chemistry.chemical_compound chemistry Environmental chemistry Greenhouse gas Carbon dioxide Constructed wetland Environmental science Carbon Nature and Landscape Conservation |
| Zdroj: | Ecological Engineering. 26:241-251 |
| ISSN: | 0925-8574 |
| DOI: | 10.1016/j.ecoleng.2005.10.005 |
| Popis: | Constructed wetlands (CW), widely used to remove nutrients from runoff waters, transform some of the carbon and nitrogen they receive into greenhouse gases, carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O), and may therefore have adverse atmospheric impacts. We studied seasonal and temporal changes in C degradation and emissions of CH 4 and N 2 O of a boreal CW used to purify peat mining runoff waters 5 (in 1992) and 15 (in 2001–2002) years after construction. There was a remarkable change in the cycling of carbon in the wetland as the number of years in operation increased: the mean CH 4 emission tripled from 140 to 400 mg CH 4 m −2 d −1 and the mean CO 2 release (respiration) doubled from 7270 to 13 600 mg CO 2 m −2 d −1 in the 10-year period. The reasons for the increased C gas production were the increased plant biomass, which doubled in 10 years, and a 3 °C higher average temperature in 2002 than in 1992. The N 2 O fluxes did not change during the study period: the mean emissions were 340 and 450 μg N 2 O m −2 d −1 in 1992 and 2002. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect