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Climate mitigation comparison of woody biomass systems with the inclusion of land-use in the reference fossil system
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. (sber)
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. (sber)
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology. (sber)
2014 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 65, p. 136-144Article in journal (Refereed) Published
Abstract [en]

While issues of land-use have been considered in many direct analyses of biomass systems, little attention has heretofore been paid to land-use in reference fossil systems. Here we address this limitation by comparing forest biomass systems to reference fossil systems with explicit consideration of land-use in both systems. We estimate and compare the time profiles of greenhouse gas (GHG) emission and cumulative radiative forcing (CRF) of woody biomass systems and reference fossil systems. A life cycle perspective is used that includes all significant elements of both systems, including GHG emissions along the full material and energy chains. We consider the growth dynamics of forests under different management regimes, as well as energy and material substitution effects of harvested biomass. We determine the annual net emissions of CO2, N2O and CH4 for each system over a 240-year period, and then calculate time profiles of cRF as a proxy measurement of climate change impact. The results show greatest potential for climate change mitigation when intensive forest management is applied in the woody biomass system. This methodological framework provides a tool to help determine optimal strategies for managing forests so as to minimize climate change impacts. The inclusion of land-use in the reference system improves the accuracy of quantitative projections of climate benefits of biomass-based systems. (c) 2014 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2014. Vol. 65, p. 136-144
Keywords [en]
Life cycle assessment, Greenhouse gases, Cumulative radiative forcing, Land-use, Time dynamics, Woody bioenergy
National Category
Energy Systems
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
URN: urn:nbn:se:lnu:diva-36191DOI: 10.1016/j.biombioe.2014.04.012ISI: 000337854900015Scopus ID: 2-s2.0-84901255653OAI: oai:DiVA.org:lnu-36191DiVA, id: diva2:735223
Available from: 2014-07-24 Created: 2014-07-24 Last updated: 2018-01-04Bibliographically approved
In thesis
1. Climate impact of the sustainable use of forest biomass in energy and material system: a life cycle perspective
Open this publication in new window or tab >>Climate impact of the sustainable use of forest biomass in energy and material system: a life cycle perspective
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Human society releases greenhouse gas emissions to the atmosphere while providing housing, heat, mobility and industrial production. Man-made greenhouse gas emissions are the main causes of climate change, coming mainly from burning fossil fuels and land-use changes. Sustainably managed forests play an important role in climate change mitigation with the prospect of sustainably providing essential materials and services as part of a low-carbon economy, both through the substitution of fossil-intensive fuels and material and through their potential to capture and store carbon in the long-term perspective.

The overall aim of this thesis was to develop a methodology under a life cycle perspective to assess the climate impact of the sustainable use of forest biomass in bioenergy and material systems. To perform this kind of analysis a methodological framework is needed to accurately compare the different biological and technological systems with the aim to minimize the net carbon dioxide emissions to the atmosphere and hence the climate impact. In such a comparison, the complete energy supply chains from natural resources to energy end-use services has to be considered and are defined as the system boundaries.

The results show that increasing biomass production through more intensive forest management or the usage of more productive tree species combined with substitution of non-wood products and fuels can significantly reduce global warming. The biggest single factor causing radiative forcing reduction was using timber to produce wood material to replace energy-intensive construction materials such as concrete and steel. Another very significant factor was replacing fossil fuels with forest residues from forest thinning, harvest, wood processing, and post-use wood products. The fossil fuel that was replaced by forest biomass affected the reductions in greenhouse gas emissions, with carbon-intensive coal being most beneficial to replace. Over the long term, an active and sustainable management of forests, including their use as a source for wood products and bioenergy allows the greatest potential for reducing greenhouse gas emissions.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2018
Series
Linnaeus University Dissertations ; 306/2018
Keywords
forest residues, fossil fuel substitution, forest management, radiative forcing, land use change, climate change, bioenergy
National Category
Energy Systems Civil Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology; Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-69561 (URN)978-91-88761-11-8 (ISBN)978-91-88761-12-5 (ISBN)
Public defence
2018-01-18, 10:00 (English)
Opponent
Supervisors
Available from: 2018-01-05 Created: 2018-01-04 Last updated: 2018-05-17Bibliographically approved

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Haus, SylviaGustavsson, LeifSathre, Roger

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