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Climate change mitigation effect of harvested wood products in regions of Japan

https://research.thinkwood.com/en/permalink/catalogue3078
Year of Publication
2015
Topic
Environmental Impact
Author
Kayo, Chihiro
Tsunetsugu, Yuko
Tonosaki, Mario
Organization
Tokyo University of Agriculture and Technology
Publisher
Springer
Year of Publication
2015
Format
Journal Article
Topic
Environmental Impact
Keywords
Harvested Wood Products
Carbon Storage Effect
Material Substitution Effect
Energy Substitution Effect
Inter-Regional Flow
Production Approach
Research Status
Complete
Series
Carbon Balance and Management
Summary
Background Harvested wood products (HWPs) mitigate climate change through carbon storage, material substitution, and energy substitution. We construct a model to assess the overall climate change mitigation effect (comprising the carbon storage, material substitution, and energy substitution effects) resulting from HWPs in regions of Japan. The model allows for projections to 2050 based on future scenarios relating to the domestic forestry industry, HWP use, and energy use. Results Using the production approach, a nationwide maximum figure of 2.9 MtC year-1 for the HWP carbon storage effect is determined for 2030. The maximum nationwide material substitution effect is 2.9 MtC year-1 in 2050. For the energy substitution effect, a nationwide maximum projection of 4.3 MtC year-1 in 2050 is established, with at least 50 % of this figure derived from east and west Japan, where a large volume of logging residue is generated. For the overall climate change mitigation effect, a nationwide maximum projection of 8.4 MtC year-1 in 2050 is established, equivalent to 2.4 % of Japan’s current carbon dioxide emissions. Conclusions When domestic roundwood production and HWP usage is promoted, an overall climate change mitigation effect is consistently expected to be attributable to HWPs until 2050. A significant factor in obtaining the material substitution effect will be substituting non-wooden buildings with wooden ones. The policy of promoting the use of logging residue will have a significant impact on the energy substitution effect. An important future study is an integrated investigation of the climate change mitigation effect for both HWPs and forests.
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Free
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The default methods in the 2019 Refinement drastically reduce estimates of global carbon sinks of harvested wood products

https://research.thinkwood.com/en/permalink/catalogue3075
Year of Publication
2021
Topic
Environmental Impact
Author
Kayo, Chihiro
Kalt, Gerald
Tsunetsugu, Yuko
Hashimoto, Seiji
Komata, Hirotaka
Noda, Ryu
Oka, Hiroyasu
Organization
Tokyo University of Agriculture and Technology
Publisher
Springer
Year of Publication
2021
Format
Journal Article
Topic
Environmental Impact
Keywords
Global Carbon Stocks
Harvested Wood Products
Carbon Removal
Carbon Emission
Research Status
Complete
Series
Carbon Balance and Management
Summary
Background The stock dynamics of harvested wood products (HWPs) are a relevant component of anthropogenic carbon cycles. Generally, HWP stock increases are treated as carbon removals from the atmosphere, while stock decreases are considered emissions. Among the different approaches suggested by the Intergovernmental Panel on Climate Change (IPCC) for accounting HWPs in national greenhouse gas inventories, the production approach has been established as the common approach under the Kyoto Protocol and Paris Agreement. However, the 24th session of the Conference of the Parties to the United Nations Framework Convention on Climate Change decided that alternative approaches can also be used. The IPCC has published guidelines for estimating HWP carbon stocks and default parameters for the various approaches in the 2006 Guidelines, 2013 Guidance, and 2019 Refinement. Although there are significant differences among the default methods in the three IPCC guidelines, no studies have systematically quantified or compared the results from the different guidelines on a global scale. This study quantifies the HWP stock dynamics and corresponding carbon removals/emissions under each approach based on the default methods presented in each guideline for 235 individual countries/regions. Results We identified relatively good consistency in carbon stocks/removals between the stock-change and the atmospheric flow approaches at a global level. Under both approaches, the methodological and parameter updates in the 2019 Refinement (e.g., considered HWPs, starting year for carbon stocks, and conversion factors) resulted in one-third reduction in carbon removals compared to the 2006 Guidelines. The production approach leads to a systematic underestimation of global carbon stocks and removals because it confines accounting to products derived from domestic harvests and uses the share of domestic feedstock for accounting. The 2013 Guidance and the 2019 Refinement reduce the estimated global carbon removals under the production approach by 15% and 45% (2018), respectively, compared to the 2006 Guidelines. Conclusions Gradual refinements in the IPCC default methods have a considerably higher impact on global estimates of HWP carbon stocks and removals than the differences in accounting approaches. The methodological improvements in the 2019 Refinement halve the global HWP carbon removals estimated in the former version, the 2006 Guidelines.
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Free
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Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

https://research.thinkwood.com/en/permalink/catalogue2397
Year of Publication
2020
Topic
Design and Systems
Environmental Impact
Material
CLT (Cross-Laminated Timber)
Application
Bridges and Spans

Estimation of carbon stocks in harvested wood products of buildings in Japan: flux-data method and direct inventory method

https://research.thinkwood.com/en/permalink/catalogue3084
Year of Publication
2022
Topic
Environmental Impact
Author
Matsumoto, Ryoto
Kayo, Chihiro
Organization
Toyko University of Agriculture and Technology
Publisher
Springer
Year of Publication
2022
Format
Journal Article
Topic
Environmental Impact
Keywords
Harvested Wood Products
Carbon Stocks
Flux-data Method
Direct Inventory Method
Half-life
Research Status
Complete
Series
Journal of Wood Science
Summary
In this study, carbon stocks in harvested wood products (HWPs) of buildings in Japan were estimated using the direct inventory method, which is highly accurate, and the flux-data method, which was proposed by the Intergovernmental Panel on Climate Change (IPCC) and is commonly used worldwide. We analyzed the differences between the estimated results and the respective reasons. The results indicate that the flux-data method greatly underestimated the carbon stocks in HWPs of buildings in Japan. In 2019, the values estimated by the flux-data method were only approximately 64% of those estimated by the direct inventory method. The half-lives of HWPs and the estimated continuous rate of change in industrial roundwood consumption proposed by the IPCC were likely the main causes of this difference. As for the decay function, the first-order decay, which is a default function proposed by the IPCC, was considered reliable for the estimations, because the decay function was not the main cause of the obtained difference.
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Life Cycle Regional Economic Impacts of Bridge Repair Using Cross-Laminated Timber Floor Slabs: A Case Study in Akita Prefecture, Japan

https://research.thinkwood.com/en/permalink/catalogue2965
Year of Publication
2022
Topic
Environmental Impact
Material
CLT (Cross-Laminated Timber)
Application
Bridges and Spans
Author
Huzita, Tomohumi
Sasaki, Takanobu
Araki, Shogo
Kayo, Chihiro
Organization
Tokyo University of Agriculture and Technology
Hokkaido University
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Bridges and Spans
Topic
Environmental Impact
Keywords
Regional Economic Impact
Input-output Analysis
Cross-laminated Timber
Waterproofing
Reinforced Concrete
Research Status
Complete
Series
Buildings
Summary
Recently, cross-laminated timber (CLT) has attracted attention as a civil engineering material in Japan. In particular, the use of CLT floor slabs for bridge repair is expected to have regional economic impacts throughout their life cycle, but their economic impacts have not been evaluated. In this study, the life cycle regional economic impacts of using non-waterproofed CLT, waterproofed CLT, and reinforced concrete (RC) floor slabs for bridge repair in Akita Prefecture, Japan, were compared. Using past-to-present input–output tables, we quantitatively evaluated the economic impacts over the life cycle of floor slabs by estimating the future input–output tables for construction, maintenance, and disposal. The results showed that the construction and maintenance costs (final demand increase) of CLT floor slabs are higher than those of RC slabs, but the regional economic impact is larger. In addition, the non-waterproofed CLT must be renewed every time it is maintained. Therefore, the demand for CLT production in the prefecture will increase, and the economic impact will be larger than that of the other two floor slabs. This demand for CLT production will not only redound to the benefit of the forestry and wood industry but also the revitalization of regional economies.
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Free
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Potential contributions of forestry and wood use to climate change mitigation in Japan

https://research.thinkwood.com/en/permalink/catalogue3074
Year of Publication
2016
Topic
Environmental Impact
Author
Matsumoto, Mitsuo
Oka, Hiroyasu
Mitsuda, Yasushi
Hashimoto, Shoji
Kayo, Chihiro
Tsunetsugu, Yuko
Tonosaki, Mario
Organization
University of Miyazaki
Tokyo University of Agriculture and Technology
Publisher
Springer
Year of Publication
2016
Format
Journal Article
Topic
Environmental Impact
Keywords
Carbon Removal
Emission Reductions
Forest Sector
Integrated Model
Model Projection
Research Status
Complete
Series
Journal of Forest Reaearch
Summary
By considering trade-offs and complementarity between carbon removal from the atmosphere by forests and emission reduction by wood use, we developed a forest-sector carbon integrated model for Japan. We discuss mitigation measures for Japan based on model projections. The integrated model included the forest model and the wood use model. Based on three scenarios (baseline, moderate increase, and rapid increase) of harvesting and wood use, the integrated model projected mitigation effects including carbon removal by forests and emission reduction through the wider use of wood, until 2050. Results indicate that forests will not become a source of net carbon emissions under the three scenarios considered. The baseline scenario is most effective for mitigating climate change, for most periods. However, the sum total of carbon removal in forests and carbon emission reductions by wood use under the rapid increase scenario exceeded the one of the moderate increase scenario after 2043. This was because of strong mitigation activities: promoting replanting, using new high-yield varieties, and wood use. The results also indicated that increases in emission reduction due to greater wood use compensated for 67.9 % of the decrease of carbon removal in 2050, for the rapid increase scenario. The results show that carbon removal in forests is most important in the short term because of the relative youth of the planted forests in Japan, and that mitigation effects by material and energy substitution may become greater over the longer term.
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Free
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6 records – page 1 of 1.