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Fluxes of CO2, CH4 and N2O from drained coniferous forests on organic soils
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Department of Inorganic Chemistry, c/o Botanical Institute, Göteborg University, Göteborg, Sweden.
Department of Forest Ecology, Swedish University of Agricultural Sciences, Umeå, Sweden.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
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2005 (English)In: Forest Ecology and Management, ISSN 0378-1127, Vol. 210, no 1-3, 239-254 p.Article in journal (Refereed) Published
Abstract [en]

Fluxes of CO2, CH4 and N2O were measured during two to three years at four sites, located within an area of 9 km2 in southern Sweden, using dark static chamber techniques. Three of the sites were drained coniferous forests on moist organic soils that differed in forest productivity and tree species. The fourth site was an undrained tall sedge mire. Although the drained sites were all moist, with average groundwater levels between 17 and 27 cm below the soil surface, the mean annual dark forest floor CO2 release rate was significantly higher at the drained sites, (0.9–1.9 kg m−2 y−1) than at the undrained mire site (0.8 to 1.2 kg m−2 y−1). CH4 emissions were significantly lower from the drained sites than from the undrained mire (0.0 to 1.6 g m−2 y−1, compared to 10.6 to 12.2 g m−2 y−1), while N2O emissions were significantly lower from the undrained site than from the drained sites (20 to 30 mg m−2 y−1, compared to 30 to 90 mg m−2 y−1). There were no clear effects of site productivity or tree species on the soil fluxes of any of the gases. The annual net primary production of the forests was modeled. All drained sites were net sinks, while the undrained mire was a net source of greenhouse gases. The estimated net greenhouse gas exchange of the drained sites was correlated with productivity: the most productive site was the largest net sink and the least productive the smallest net sink for greenhouse gases. The results indicate that, to mitigate the increase of atmospheric greenhouse gases, drained forest sites, which have been unsuccessfully drained or rewetted due to subsidence, should be managed in a way that keeps the groundwater level at a steady state.

Place, publisher, year, edition, pages
2005. Vol. 210, no 1-3, 239-254 p.
Keyword [en]
Forestry drainage; Forest productivity; CO2 flux; CH4 flux; N2O flux
National Category
Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:liu:diva-13452DOI: 10.1016/j.foreco.2005.02.031OAI: oai:DiVA.org:liu-13452DiVA: diva2:20776
Available from: 2004-12-12 Created: 2004-12-12 Last updated: 2009-06-08
In thesis
1. Forests and Greenhouse gases. Fluxes of CO2, CH4 and N2O from drained forests on organic soils
Open this publication in new window or tab >>Forests and Greenhouse gases. Fluxes of CO2, CH4 and N2O from drained forests on organic soils
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One of the largest environmental threats believed to be facing us today is global warming due to the accumulation of green house gases (GHG). The concentrations of GHG in the atmosphere are a result of the net strength of different sinks and sources. Forests, in this context, are of particular interest because of their dual role as both sinks and sources. Most forests are net sinks for CO2 but others, such as drained forests, may be significant sources of both CO2 and N20. Consequently, it is essential to understand the fluxes of GHG between drained forests and the atmosphere in order to obtain accurate estimates of national GHG budgets.

The findings reported in this thesis and the accompanying papers are based on dark chamber flux measurements of soil GHG fluxes and modelled annual net primary productions in five drained forest sites and two undrained sites situated on organic soil.

Temporal variations in forest floor CO2, release could be explained, to a large extent, by differencies in temperature and groundwater level. The within-site spatial variation in soil GHG fluxes could only be explained to a very small extent by distance to tree stems. Much of the among-site variations in soil CO2 and CH4 release could be caused by differences in the mean annual groundwater table, while N20 emissions were strongly correlated to the carbon-to-nitrogen ratio of soil organic matter. Most poorly drained forested areas are probably net sinks for GHG as the CO2 uptake by trees more than compensates for the soil GHG emissions. However, the total drained forested area in Sweden was estimated to be a net source of GHG. The CO2 release from decomposition of soil organic matter stored before drainage was estimated to be substantial. Corresponding to 15% of the CO2 release from the consumption of fossil fuels.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2004. 47 p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 302
Keyword
Greenhouse gases, GHG, fluxes of CO2, CH4, drained forests, organic soils, Skogsbotanik, miljöaspekter, växthusgaser
National Category
Oceanography, Hydrology, Water Resources
Identifiers
urn:nbn:se:liu:diva-4853 (URN)91-85295-71-X (ISBN)
Public defence
2004-11-26, Elysion, Hus T, Campus Valla, Linköpings universitet, Linköping, 10:00 (English)
Supervisors
Note

On the day of the public defence of the doctoral thesis the status of the articles I and II was: Conditionally accepted; article III was: Submitted and articles IV and V was: Manuscript. The title of article III was on the day of the public defence "Can the distribution of trees explain the spatial variation in N2O emissions from boreal forest soils?".

Available from: 2004-12-12 Created: 2004-12-12 Last updated: 2014-09-02Bibliographically approved

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von Arnold, KarinSvensson, Bo H.

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