The Mitsui & Co. Environment Fund

Introduction to Grant Projects

Kyushu University, Faculty of Agriculture    Assistant professor: Hiroki Sakagami

Elucidation of the natural healing mechanism of bark that has been extensively annellated by deer and proposal for a damage control method based on this mechanism

Research grant

Project Description

Plant mortality attributed to bark stripping by deer has a major impact on the ecosystem and forestry, and significantly reduces the public benefit function of forests. Prompt and timely resolution of this issue is of critical importance. In this study, we propose an effective method for preventing the death of 100-year-old Enkianthus campanulatus in the Yatsugatake plateau that have been damaged by deer. This method makes use of the specific restoration ability of the bark identified in previous studies. To that end, we will undertake (1) elucidation of the time of formation layer activity that affects peel strength of the bark and the cell morphology at that time, (2) elucidation of the time of easiest bark peeling by means of tensile testing, and (3) elucidation of the specific repair mechanism of the bark that is the core element of this research, and (4) investigate other tree species to which this technology can be transferred, with the ultimate goal of proposing a symbiotic deer damage control method that limits the countermeasure period to the shortest possible timeline. [No. R19-0042]

Mitsui & Co. Environment Fund FY2019 Research Grants List (PDF 508KB)

Ecosystems and the Symbiotic Society
Grant year
FY2019 Research Grants
Grant term
3 years (April 2020 to March 2023)
Grant amount
Activity region
Minamimaki Village, Minamisaku District, Nagano Prefecture
Enkianthus campanulatus stripped of bark by a deer

Overview of the Organization

Assistant professor: Hiroki Sakagami
Project organization
Kyushu University, Faculty of Agriculture
Assistant professor: Hiroki Sakagami
Specialist field: Wood science
Affiliated academic societies: Japan Wood Research Society, Wood Technological Association of Japan, Japan Wood Protection Association
Background: After graduating from Kyushu University's Graduate School of Bioresources and Environmental Sciences, he worked in a private company before assuming in his current position in January 2011. He earned a doctorate (agriculture) from the same university.
Research record
Hiroki Sakagami, Microcrack propagation in transverse surface from heartwood to sapwood during drying, Journal of Wood Science, 10.1186/s10086-019-1812-6, 65, 33, 2019.
Hiroki Sakagami, Saki Higurashi, Tetsuya Tsuda, Satoshi Seino, Susumu Kuwabata, Decay resistance of Polymerized ionic liquid modified woods, Bioresources, 13, 3, 5702-5710, 2018.
Hiroki Sakagami, Atsuro Tokunaga, Noboru Fujimoto, Shinya Koga, Isao Kobayashi, Ikuo Momohara, Effects of drying temperature for Cryptomeria japonica on the permeability of wood preservative. II. The permeability of dried, split log pieces, Bioresources, 10.15376/biores.11.3.6896-6908, 11, 3, 6896-6908, 2016.
Hiroki Sakagami, Junji Matsumura, Tetsuya Tsuda, Susumu Kuwabata, Visualization of Wood Cells by Electron Microscopy Using Ionic Liquid, Japanese Society of Electron Microscopy Technology for Medicine and Biology, 29(1), 14-19, 2015.

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