Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions
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 usin...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
KTH, Mark- och vattenteknik
2006
|
Subjects: | |
Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4240 |
id |
ftkthstockholm:oai:DiVA.org:kth-4240 |
---|---|
record_format |
openpolar |
spelling |
ftkthstockholm:oai:DiVA.org:kth-4240 2023-05-15T17:44:35+02:00 Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions Svensson, Magnus 2006 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4240 eng eng KTH, Mark- och vattenteknik Stockholm : KTH Trita-LWR. PHD, 1650-8602 1029 orcid:0000-0002-0926-3304 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4240 urn:isbn:978-91-7178-544-2 info:eu-repo/semantics/openAccess boreal climate CoupModel net ecosystem production nitrogen process-based model soil carbon Natural Sciences Naturvetenskap Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2006 ftkthstockholm 2022-10-26T22:29:40Z 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 ... Doctoral or Postdoctoral Thesis Northern Sweden Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA |
institution |
Open Polar |
collection |
Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA |
op_collection_id |
ftkthstockholm |
language |
English |
topic |
boreal climate CoupModel net ecosystem production nitrogen process-based model soil carbon Natural Sciences Naturvetenskap |
spellingShingle |
boreal climate CoupModel net ecosystem production nitrogen process-based model soil carbon Natural Sciences Naturvetenskap Svensson, Magnus Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions |
topic_facet |
boreal climate CoupModel net ecosystem production nitrogen process-based model soil carbon Natural Sciences Naturvetenskap |
description |
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 ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Svensson, Magnus |
author_facet |
Svensson, Magnus |
author_sort |
Svensson, Magnus |
title |
Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions |
title_short |
Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions |
title_full |
Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions |
title_fullStr |
Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions |
title_full_unstemmed |
Carbon dynamics in spruce forest ecosystems - modelling pools and trends for Swedish conditions |
title_sort |
carbon dynamics in spruce forest ecosystems - modelling pools and trends for swedish conditions |
publisher |
KTH, Mark- och vattenteknik |
publishDate |
2006 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4240 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
Trita-LWR. PHD, 1650-8602 1029 orcid:0000-0002-0926-3304 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4240 urn:isbn:978-91-7178-544-2 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766146823832993792 |