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Pools and fluxes of carbon in three Norway spruce ecosystems along a climatic gradient in Sweden

Författare:
Publiceringsår: 2008
Språk: Engelska
Sidor: 7-25
Publikation/Tidskrift/Serie: Biogeochemistry
Volym: 89
Nummer: 1
Dokumenttyp: Artikel
Förlag: Springer

Sammanfattning

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).

Disputation

Nyckelord

  • Earth and Environmental Sciences
  • soil carbon
  • climatic gradient
  • CoupModel
  • root
  • dissolved organic carbon
  • litter
  • boreal ecosystems

Övriga

Published
  • Climate Initiative
Yes
  • ISSN: 0168-2563

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