Development History of Thinned Wood Utilization Technology in Ryujin Village, Tanabe City, Wakayama Prefecture (2000s–2020s)

Development History of Thinned Wood Utilization Technology in Ryujin Village, Tanabe City, Wakayama Prefecture (2000s–2020s)

2000s: Emergence of Thinned Wood Utilization Technology
In Ryujin Village, Tanabe City, Wakayama Prefecture, the effective use of thinned wood became a significant regional issue, and the "Pod Method" gained attention in 2007. This method, developed by a research team at Kyoto University, uses cedar and cypress thinned wood to create rectangular wooden frames, which are combined to form a box structure with earthquake resistance. At the time, a model facility near the "Atelier Ryujin House" in the village was planned as a base for local residents and artists. This period marked the beginning of efforts to prevent forest degradation and utilize regional resources.

2010s: Expansion of Technology and Strengthening of Regional Brands
In the 2010s, the use of thinned wood began to spread nationwide, and the "Ryujin Wood" brand was established in Ryujin Village. During this period, the Ryujin Village Forest Association played a leading role in actively producing products using thinned wood. Products such as dunnage, stakes, and wood chips made from local thinned wood were introduced to the market, becoming a significant source of income for the regional economy. The "Pod Method," developed by Kyoto University, was evaluated as a construction technology with high earthquake resistance that could be locally produced, and its use expanded to local sawmills and construction companies. This further enhanced the value of thinned wood utilization and established it as a model for sustainable forest management.

2020s: Increased Environmental Awareness and Utilization of Circular Resources
In the 2020s, forest conservation and collaboration with local industries progressed further in Ryujin Village, Wakayama Prefecture. The Ryujin Village Forest Association manufactures and sells products such as wood chips through the Thinned Wood Distribution Center, gaining attention as a circular resource contributing to CO₂ emissions reduction. Additionally, Kyoto University's "j.Pod Method" has been improved to incorporate rib frame structures made of metal plates and wood, achieving both the utilization of local materials and high earthquake resistance. These efforts have positioned Ryujin Village as a leading example of sustainable forest management and regional revitalization.

Summary
The efforts to utilize thinned wood, which began in the 2000s, progressed to implementation and dissemination in the 2010s and have developed into a model case for a circular society in the 2020s. Ryujin Village's "Ryujin Wood" and the "j.Pod Method" are widely recognized as successful examples of balancing environmental conservation and the regional economy.