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Modelling soil C sequestration in spruce forest ecosystems along a Swedish transect based on current conditions
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, 95-119 p.Article in journal (Refereed) Published
Abstract [en]

The change of current pools of soil C in Norway spruce ecosystems in Sweden were studied using a process-based model (CoupModel). Simulations were conducted for four sites representing different regions covering most of the forested area in Sweden and representing annual mean temperatures from 0.7 degrees C to 7.1 degrees C. The development of both tree layer and field layer (understory) was simulated during a 100-year period using data on standing stock volumes from the Swedish Forest Inventory to calibrate tree growth using different assumptions regarding N supply to the plants. The model successfully described the general patterns of forest stand dynamics along the Swedish climatic transect, with decreasing tree growth rates and increasing field layer biomass from south to north. However, the current tree growth pattern for the northern parts of Sweden could not be explained without organic N uptake and/or enhanced mineralisation rates compared to the southern parts. Depending on the assumption made regarding N supply to the tree, different soil C sequestration rates were obtained. The approach to supply trees with both mineralised N and organic N, keeping the soil C:N ratio constant during the simulation period was found to be the most realistic alternative. With this approach the soils in the northern region of Sweden lost 5 g C m(-2) year(-1), the soils in the central region lost 2 g C m(-2) year(-1), and the soils in the two southern regions sequestered 9 and 23 g C m(-2) year(-1), respectively. In addition to climatic effects, the feedback between C and N turnover plays an important role that needs to be more clearly understood to improve estimates of C sequestration in boreal forest ecosystems.

Place, publisher, year, edition, pages
2008. Vol. 89, no 1, 95-119 p.
Keyword [en]
boreal, carbon, CoupModel, climate, nitrogen, organic nitrogen uptake
National Category
Agricultural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6648DOI: 10.1007/s10533-007-9134-yISI: 000257201300008Scopus ID: 2-s2.0-46249102136OAI: oai:DiVA.org:kth-6648DiVA: diva2:11414
Note
Uppdaterad från manusript till artikel: 20100922 Tidigare titel: Soil C in spruce forest ecosystems in Sweden – modelling current pools and trends using different assumptions on N supply. QC 20100922Available from: 2006-12-15 Created: 2006-12-15 Last updated: 2017-12-14Bibliographically 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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