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Can distribution of trees explain variation in nitrous oxide fluxes?
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Botanical Institute, Göteborg University, Göteborg, Sweden.
Department of Forest Ecology, Swedish University of Agricultural Sciences, Umå, Sweden.
Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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2005 (English)In: Scandinavian Journal of Forest Research, ISSN 0282-7581, Vol. 20, no 6, 481-489 p.Article in journal (Refereed) Published
Abstract [en]

The impact of distance to tree stems on nitrous oxide (N2O) fluxes was examined to determine whether it is possible to improve the accuracy of flux estimates from boreal forest soils. Dark static chambers were placed along transects between pairs of trees within a Norway spruce stand and fluxes of N2O and carbon dioxide (CO2) were measured during the period 1999-2003. The groundwater table was measured on every sampling occasion along the transects. In addition, radiation transmission, potential diffusion rate and biomass of forest floor vegetation were measured once at each chamber site along one of the transects and soil samples were collected at three depths, from which pH, denitrification enzyme activity, soil moisture, organic matter, and carbon and nitrogen content were determined. There was a high level of variation in the N2O fluxes, both spatially and temporally. However, the spatial variation in the N2O fluxes within the transect could not be explained by differences in any of the measured variables. Sometimes, mainly when no major peaks occurred, N2O fluxes were significantly correlated with CO2 release. It is concluded that distance to stems cannot be used to improve the design of sampling schemes or for extrapolating flux levels to larger scales.

Place, publisher, year, edition, pages
2005. Vol. 20, no 6, 481-489 p.
Keyword [en]
Denitrification, nitrogen transformation, nitrous oxide emission, root dynamics, spatial variation, spruce (Picea abies)
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-13454DOI: 10.1080/02827580500443443OAI: diva2:20778
Available from: 2004-12-12 Created: 2004-12-12 Last updated: 2009-03-16Bibliographically approved
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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