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Simulated climate change impacts on fluxes of carbon in Norway spruce ecosystems along a climatic transect in Sweden
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.ORCID iD: 0000-0002-0926-3304
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2008 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 89, no 1, 81-94 p.Article in journal (Refereed) Published
Abstract [en]

A simulation study based on recent regional climate scenarios for Sweden investigated possible changes in carbon (C) dynamics and net ecosystem exchange (NEE) of Swedish Norway spruce forest ecosystems. Four sites, representative of well-drained soils in four regions, were included. Stand development was simulated for a 100-year rotation period using a coupled model describing abiotic and biotic processes in the soil-plant-atmosphere system. Two IPCC climate change scenarios, corresponding to a mean annual temperature increase of about 2 degrees C (A2) or 3 degrees C (B2) from the reference period 1961-1990 to a new period 2061-2090, were considered. Annual maximum snow depth decreased with the increase in air temperature, whereas maximum soil frost depth and mean annual soil temperature showed only small changes, especially for the sites in northern Sweden. Simulations suggested that in the warmer climate, gross primary production (GPP) increased by 24-32% in northern Sweden and by 32-43% in the south. In the north, the increase was related to the combined effect of air and soil temperature extending the growing season, whereas in the south it was mainly governed by increased N availability due to increased soil temperature. NEE increased by about 20% (A2) or 25% (B2) at all sites, more or less solely due to increased accumulation of C in the tree biomass (including harvest residues), since changes in soil C were small compared with the current climate. Both light use efficiency and water use efficiency were improved in the future climate scenarios, despite increases in atmospheric CO2 not being considered.

Place, publisher, year, edition, pages
2008. Vol. 89, no 1, 81-94 p.
Keyword [en]
air temperature, boreal, CoupModel, net ecosystem exchange, nitrogen, soil temperature, soil frost, soil respiration
National Category
Agricultural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6650DOI: 10.1007/s10533-007-9147-6ISI: 000257201300007Scopus ID: 2-s2.0-46249117260OAI: oai:DiVA.org:kth-6650DiVA: diva2:11416
Note
Uppdaterad från manuskript till artikel: 20100922 Tidigare titel: Climate change impacts on fluxes of carbon in Norway spruce ecosystems along a climatic transect in Sweden. QC 20100922Available from: 2006-12-15 Created: 2006-12-15 Last updated: 2011-09-01Bibliographically approved
In thesis
1. Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions
Open this publication in new window or tab >>Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Carbon (C) pools and fluxes in northern hemisphere forest ecosystems are attracting increasing attention concerning predicted climate change. This thesis studied C fluxes, particularly soil C dynamics, in spruce forest ecosystems in relation to interactions between physical/biological processes using a process-based ecosystem model (CoupModel) with data for Swedish conditions. The model successfully described general patterns of C and N dynamics in managed spruce forest ecosystems with both tree and field layers. Using regional soil and plant data, the change in current soil C pools was -3 g C m-2 yr-1 in northern Sweden and +24 g C m-2 yr-1 in southern Sweden. Simulated climate change scenarios resulted in increased inflows of 16-38 g C m-2 yr-1 to forest ecosystems throughout Sweden, with the highest increase in the south and the lowest in the north. Along a north-south transect, this increased C sequestration mainly related to increased tree growth, as there were only minor decreases in soil C pools. Measurements at one northern site during 2001-2002 indicated large soil C losses (-96 g C m-2 yr-1), which the model successfully described. However, the discrepancy between these large losses and substantially smaller losses obtained in regional simulations was not explained. A simulation based on Bayesian calibration successfully reproduced measured C, water and energy fluxes, with estimated uncertainties for major components of the simulated C budget. Site-specific measurements indicated a large contribution from field layer fine roots to total litter production, particularly in northern Sweden. Mean annual tree litter production was 66% higher at the most southerly site (240 g C m-2 yr-1 compared with 145 g C m-2 yr-1 in the north), but when field and bottom layers were included the difference decreased to 16% (total litter production 276 g C m-2 yr-1 and 239 g C m-2 yr-1 respectively). Regional simulations showed that decomposition rate for the stable soil C fraction was three times higher in northern regions compared with southern, providing a possible explanation why soil C pools in southern Sweden are roughly twice as large as those in the north.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. viii, 25 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1029
Keyword
boreal, climate, CoupModel, net ecosystem production, nitrogen, process-based model, soil carbon
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-4240 (URN)978-91-7178-544-2 (ISBN)
Public defence
2006-12-19, D3, Lindstedtsvägen 5, KTH, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100922Available from: 2006-12-15 Created: 2006-12-15 Last updated: 2010-09-22Bibliographically approved

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