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Soil CN ratio as a scalar parameter to predict nitrous oxide emissions
Botanical Institute, Göteborg University, Göteborg, Sweden.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Botanical Institute, Göteborg University, Göteborg, Sweden.
Danish Centre of Forest, Landscape and Planning, The Royal Veterinary and Agricultural University, Hørsholm, Denmark.
2005 (English)In: Global Change Biology, ISSN 1354-1013, Vol. 11, no 7, 1142-1147 p.Article in journal (Refereed) Published
Abstract [en]

Forested histosols have been found in some cases to be major, and in other cases minor, sources of the greenhouse gas nitrous oxide (N2O). In order to estimate the total national or global emissions of N2O from histosols, scaling or mapping parameters that can separate low- and high-emitting sites are needed, and should be included in soil databases. Based on interannual measurements of N2O emissions from drained forested histosols in Sweden, we found a strong negative relationship between N2O emissions and soil CN ratios (r2adj=0.96, mean annual N2O emission=ae(−b CN ratio)). The same equation could be used to estimate the N2O emissions from Finnish and German sites based on CN ratios in published data. We envisage that the correlation between N2O emissions and CN ratios could be used to scale N2O emissions from histosols determined at sampled sites to national levels. However, at low CN ratios (i.e. below 15–20) other parameters such as climate, pH and groundwater tables increase in importance as regulating factors affecting N2O emissions.

Place, publisher, year, edition, pages
2005. Vol. 11, no 7, 1142-1147 p.
Keyword [en]
CN ratio, drainage, histosol, mapping, nitrous oxide, scaling
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-13455DOI: 10.1111/j.1365-2486.2005.00973.xOAI: diva2:20779
Available from: 2004-12-12 Created: 2004-12-12
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.
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 302
Greenhouse gases, GHG, fluxes of CO2, CH4, drained forests, organic soils, Skogsbotanik, miljöaspekter, växthusgaser
National Category
Oceanography, Hydrology, Water Resources
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)

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, Karin
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