2020 Activity Report for Mission5-4:
Scientific Research on Wood Selection and its Contribution to Society: Wooden Architecture, Living Environments, Wood Resources/Databases, and Transition of Usage

Updated: 2021/04/30


13th Tachibana Award, Honorable Mention in Researcher Category

【Winner】Suyako Tazuru
【Awarding Organization】 Kyoto University
【Date】March 3

Research1: Investigation of wood information in East Asia

Principal Investigator (PI): Suyako Tazuru (RISH, Kyoto University)
Research collaborator(s): Tomoya Imai, Keiichi Baba (RISH, Kyoto University)

It is clear that our wood-based resource culture has been strongly influenced by East Asian countries. Exchanging information with neighboring countries opens a new horizon for understanding mutual relationships. This year, we focused on Asian old wooden statues preserved in Museum of Fine Arts, Boston and Cleveland Museum of Art in USA. The results were partly published.
In Japan, such as Torreya nucifera, Chamaecyparis obtusa, Cerusus sp., Zelkova serrata and so on were traditionally used for wooden statues. Our wood identification project conducted in the USA showed that the wood species selected for wood statues in China were completely different from those in Japan. It is indeed impossible to draw any conclusions from the results so far, however, the information on wood species obtained from the Chinese statues survey may contain important hints for understanding Buddhist sculpture in Asia. Continued research would be needed to understand why and how these wood species were selected for Asian statues.

Publications, etc.

  1. 田鶴寿弥子 杉山淳司 重要文化財裏千家住宅保存修理工事における部材の樹種識別調査 木材学会誌 , 67,1 , 2021.
  2. 喜多祐介 田鶴寿弥子 竹下弘展 杉山淳司 近赤外分光法と多変量解析を用いた建築用材の識別とその汎化性能向上, 木材学会誌 , 66, 3, 171 182 , 2020.
  3. 田鶴寿弥子 木材の樹種識別の今とこれから Cellulose Communications, 27, 21, 50 53 , 2020.
  4. Sung Wook Hwang Suyako Tazuru , Junji Sugiyama , Wood Identification of a Historical Architecture in Korea by Synchrotron X ray Microtomography based Three Dimensional Microstructural Imaging , Journal of the Korean Wood Science and Technology, 48, 3, 283 290 , 2020.
  5. 5Yusuke Kita, Suyako Tazuru, Junji Sugiyama Two dimensional microfibril angle mapping via polarization microscopy for wood classification, IOP Conf. Series: Earth and Environmental Science, 012028, 415, 2020.
  6. 田鶴寿弥子 重要文化財菅田庵及び向月亭ほか一棟保存修理工事事業における部材の樹種識別調査 茶の湯文化学 , 35 , 2020 .

Research 2 : Dendroclimatology in equatorial regions

Principal Investigator (PI): Tomoya Imai (RISH, Kyoto University),
Research collaborator(s): Takahiro Tagami (Kyoto University), Yumiko Watanabe (Kyoto University), Yoshito Katayama (Kyoto University), Suyako Tazuru (RISH, Kyoto University) and Junji Sugiyama (Kyoto University)

Dendroclimatology of Javanese teak: We performed a forward model analysis of tree-ring cellulose oxygen isotopic ratios, in order to improve our understanding of teak isotopes as a precipitation proxy on Java, Indonesia.
Dendroclimatology of Japanese cedar: We analyzed tree-ring width and cellulose isotopic ratios of cedar disks collected from Hieizan, Shiga during the last 350 years. By comparison with the master chronology of oxygen isotopes, tree-ring growing duration was determined. Correlation analysis between oxygen isotopes and meteorological data showed negative correlations with precipitation in May and June and relative humidity in June, suggesting that they could be useful as rainfall proxies.

Publications, etc.

  1. Ohmuro, W., Watanabe, Y., Li, Z. and Nakatsuka, 2020. Cellulose oxygen isotopic time series of teak disks collected from Bago Mountains, Myanmar.  JpGU-AGU Joint Meeting 2020, virtual meeting, July 12-16th, 2020.
  2. Watanabe, Y.、Hisamochi, R., Sano, M., Nakatsuka, T. and Tagami, T., 2020. Cellulose oxygen isotopic time series of teak disks collected from Java, Indonesia.  JpGU-AGU Joint Meeting 2020, virtual meeting, July 12-16th, 2020.
  3. Katayama, Y., Watanabe, Y., Li, Z. and Nakatsuka, 2020. Hydrogen, carbon, and oxygen isotopic variations of tree ring cellulose in Mt. Hiei, Shiga.  The 5th Asia Research Node Symposium on Humanosphere Science, virtual meeting, December 22-23th, 2020.
  4. Nakajima, K., Li, Z., Nakatsuka, T., Watanabe, Y. and Tagami, T., 2020. Intra-annual variations of cellulose oxygen and hydrogen isotopic ratios in wood samples collected from archaeological sites.  The 37th JSSSCP Congress, virtual meeting, Semptember 5-13th, 2020.
  5. Watanabe, Y., 2021. Rainfall information by tree-ring width and cellulose isotopic ratio: case studies in Indonesia and Myanmar.  The 441th Humanosphere Science Symposium, virtual meeting, March 2nd, 2021.

Research 3 : Wooden building technologies: innovation based on traditional wisdom

Principal Investigator (PI): Hiroshi Isoda (RISH, Kyoto University),
Research collaborator(s): Takafumi Nakagawa, Zherui Li, Kohei Komatsu(RISH,Kyoto University), Akishisa Kitamori(Osaka Sangyo University), Que Zeli (Nanjing Forestry University), Min-Fu Hsu (National Cheng Kung University)

Aiming to create a safe and secure type of wooden living space for the future, we will deepen our understanding of the wisdom embodied in wood technologies by investigating traditional or modern wooden buildings. On the basis of that knowledge, we will develop high-performance wooden materials.
  In order to find a way to properly evaluate the structural performance of large-scale wooden frameworks with regard to traditional construction techniques, improvement of evaluation methods for detached columns with hanging walls that take into account traditional joint strength, as well as technical improvements to the construction method of drilled pillars with enhance durability and rigidity has been carried out. And for preservation and maintenance of wooden cultural property buildings, we are investigating an improvement of ultrasonic measurement method to search for internal defects of wood members.
  The static loading tests of the traditional timber frame with the sizeable dimensional column and the Kashira-nuki system that applied in traditional Japanese residential houses have been carried out to evaluate seismic performance. The bending tests for a large dimensional column with a notch for sashi-gamoi beam also have been conducted to decide the section modulus.

Publications, etc.

  1. Dot Corporation and RISH Kyoto University: Report of lateral behavior of the traditional timber frame considering deep column and beam, funded by MLIT, 2021.3
  2. Kohei Komatsu, Akishisa Kitamori, Takafumi Nakagawa, Shoich Nakashima, Hiroshi Isoda: Research on the Mechanism of Flexible Structure Found in the Traditional Wooden Architectures in East Asia Part 1 – Influence of Japanese-style head-penetrating tie-beam specifications on the column restoring force, Summaries of Technical Papers of Annual Meeting, (2020)
  3. Li Zherui, Akihisa Kitamori, Takafumi Nakagawa, Yasuhiro Araki, Hiroshi Isoda: Lateral Resistance of Traditional Timber Frame with Large Cross-section. Part.3 Diagonal Effect of the Sashigamoi Tie-beam and the Interaction with Beam-end Joints Part3 Effect of dimensional sashi-gamoi beam, Summaries of Technical Papers of Annual Meeting, (2020)

Research 4: High-performance wood-based materials

Principal Investigator (PI): Kenji Umemura (RISH, Kyoto University)
Research collaborator(s): Daisuke Ando (RISH, Kyoto University), Min Zhang (School of Forestry and Biotechnology, Zhejiang A&F University) , Zhongyuan Zhao (College of Furnishings and Industrial Design, Nanjing Forestry University), Ragil Widyorini(Faculty of Forestry, Universitas Gadjah Mada)Sukma Surya Kusumah(Indonesian Instutute of Scinece, Research Center for Biomaterials), Rahma Nur Komariah(Faculty of Forestry, Jambi University), Md. Iftekhar Shams (Forestry and Wood Technology Discipline, Khulna University)

Effective utilization of wood and wood-based materials contributes to preventing global warming and accelerating decarbonization. Considering decrease of global forest area and breaking away from dependence on fossil resources, the development of wood-based materials combined with unutilized lignocellulose resources and natural adhesives derived from bio resources is desirable.
Recently, development of particleboard using inner part of oil palm trunk are being carried out to investigate the utilization of agricultural wastes of as a raw material for wood-based materials. When ammonium phosphate was used as additives, the obtained binderless particleboard had excellent water resistant. As a result of investigating the mechanism, it was clarified that ADP decomposed a part of hemicellulose components in oil palm to generate free sugar, which was changed to a polymer substance containing furan compound and contributed to the water resistant of the particleboard.
Regarding collaborative research with China, Indonesia and Bangladesh, we discussed future research plan and acceptance of student.

Publications, etc. 

Rahma Nur KOMARIAH, Takuji MIYAMOTO, Sukma Surya KUSUMAH, Soichi TANAKA, Toshiaki UMEZAWA, Kozo KANAYAMA and Kenji UMEMURA: Influence of water-soluble extract of the inner part of oil palm trunk on the binderless particleboard adding ammonium dihydrogen phosphate. BioResources (submitted)

2019 Activity Report

Gokasho, Uji City, Kyoto Prefecture, Japan. 611-0011
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