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Greenhouse gas fluxes from drained organic forestland in Sweden
Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
Department of Silviculture, Swedish University of Agricultural Sciences, Umeå, Sweden.
Botanical Institute, Göteborg University, Göteborg, Sweden.
Department of Forest Soils, Swedish University of Agricultural Sciences, Uppsala, Sweden.
2005 (Engelska)Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, Vol. 20, nr 5, s. 400-411Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The objective of this study was to estimate the contribution of drained organic forestlands in Sweden to the national greenhouse gas budget. Drained organic forestland in Sweden collectively comprises an estimated net sink for greenhouse gases of -5.0 Mt carbon dioxide (CO2) equivalents year-1 (range -12.0 to 1.2) when default emission factors provided by the Good practice guidance for land use, land-use change and forestry are used, and an estimated net source of 0.8 Mt CO2 equivalents year-1 (range -6.7 to 5.1) when available emission data for the climatic zones spanned by Sweden are used. This discrepancy is mainly due to differences in the emission factors for heterotrophic respiration. The main uncertainties in the estimates are related to carbon changes in the litter pool and releases of soil CO2 and nitrous oxide.

Ort, förlag, år, upplaga, sidor
2005. Vol. 20, nr 5, s. 400-411
Nyckelord [en]
Carbon dioxide; good practice guidance; greenhouse gas budget; methane; nitrous oxide; peat; scaling
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Identifikatorer
URN: urn:nbn:se:liu:diva-13456DOI: 10.1080/02827580500281975OAI: oai:DiVA.org:liu-13456DiVA, id: diva2:20780
Tillgänglig från: 2004-12-12 Skapad: 2004-12-12 Senast uppdaterad: 2018-01-13
Ingår i avhandling
1. Forests and Greenhouse gases. Fluxes of CO2, CH4 and N2O from drained forests on organic soils
Öppna denna publikation i ny flik eller fönster >>Forests and Greenhouse gases. Fluxes of CO2, CH4 and N2O from drained forests on organic soils
2004 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2004. s. 47
Serie
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 302
Nyckelord
Greenhouse gases, GHG, fluxes of CO2, CH4, drained forests, organic soils, Skogsbotanik, miljöaspekter, växthusgaser
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Identifikatorer
urn:nbn:se:liu:diva-4853 (URN)91-85295-71-X (ISBN)
Disputation
2004-11-26, Elysion, Hus T, Campus Valla, Linköpings universitet, Linköping, 10:00 (Engelska)
Handledare
Anmärkning

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?".

Tillgänglig från: 2004-12-12 Skapad: 2004-12-12 Senast uppdaterad: 2018-01-13Bibliografiskt granskad

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