Pools and fluxes of carbon in three Norway spruce ecosystems along a climatic gradient in Sweden.
2008 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 89, no 1, 7-25 p.Article in journal (Refereed) Published
This paper presents an integrated analysis of organic carbon (C) pools in soils and vegetation, within-ecosystem fluxes and net ecosystem exchange (NEE) in three 40-year old Norway spruce stands along a north-south climatic gradient in Sweden, measured 2001-2004. A process-orientated ecosystem model (CoupModel), previously parameterised on a regional dataset, was used for the analysis. Pools of soil organic carbon (SOC) and tree growth rates were highest at the southernmost site (1.6 and 2.0-fold, respectively). Tree litter production (litterfall and root litter) was also highest in the south, with about half coming from fine roots (< 1 mm) at all sites. However, when the litter input from the forest floor vegetation was included, the difference in total litter input rate between the sites almost disappeared (190-233 g C m(-2) year(-1)). We propose that a higher N deposition and N availability in the south result in a slower turnover of soil organic matter than in the north. This effect seems to overshadow the effect of temperature. At the southern site, 19% of the total litter input to the O horizon was leached to the mineral soil as dissolved organic carbon, while at the two northern sites the corresponding figure was approx. 9%. The CoupModel accurately described general C cycling behaviour in these ecosystems, reproducing the differences between north and south. The simulated changes in SOC pools during the measurement period were small, ranging from -8 g C m(-2) year(-1) in the north to +9 g C m(-2) year(-1) in the south. In contrast, NEE and tree growth measurements at the northernmost site suggest that the soil lost about 90 g C m(-2) year(-1).
Place, publisher, year, edition, pages
2008. Vol. 89, no 1, 7-25 p.
soil carbon, boreal ecosystems, climatic gradient, CoupModel, root litter, dissolved organic carbon
IdentifiersURN: urn:nbn:se:kth:diva-6649DOI: 10.1007/s10533-007-9136-9ISI: 000257201300002ScopusID: 2-s2.0-46249089502OAI: oai:DiVA.org:kth-6649DiVA: diva2:11415
Uppdaterad från manuskript till artikel: 20100922
QC 201009222006-12-152006-12-152010-09-22Bibliographically approved