Surveys on Aizugiri, Paulownia Produced in Aizu District in Fukushima Prefecture
The Department of Intangible Cultural Heritage continues to conduct surveys of the raw materials which support intangible cultural heritage. We have been focusing on techniques to collect and process trees as materials, and conduct surveys, recordings, and a reevaluation of the disappearing techniques and knowledge since FY2020. These activities are supported by the Research Grants in the Humanities of the Mitsubishi Foundation offered for the project “Research on Traditional Wood-use Techniques and Knowledge Regarding Intangible Cultural Heritage.” As a part of these surveys, we visited Mishima Town, Fukushima Prefecture on July 14th, 2022 and investigated the production status and associated issues of Aizugiri: paulownia timbers planted and produced there in Aizu district.
Paulownia timbers are excellent materials because of their characteristics: lightness, limited distortion, excellent function of humidity control, and low heat conductivity. They are generally well-known as materials for Japanese traditional chests and wooden clogs. They have also long been used for koto, a Japanese traditional musical instrument. Furthermore, paulownia boxes have been popular as the most suitable conservation containers for fine arts and crafts. However, the domestic demand for paulownia materials shrunk to approximately one eighth compared to 1959 at their peak, partly because of a shift in consumer preferences away from Japanese traditional chests. Additionally, domestic materials among the overall paulownia material supply dropped sharply. At their peak, domestic materials represented almost 95% of the total supply in Japan. However, they dropped to approximately three percents as of 2018 because of imported paulownia timbers (Data by Mishima Town). The production of Nanbugiri, paulownia produced in Nambu district in Iwate Prefecture, had already ceased, although it was as popular as Aizugiri. The annual market dedicated to paulownia timbers in Yuzawa City, Akita Prefecture, which was the last one, has now been halted. Domestic paulownia timbers are now only produced in limited districts, including Aizugiri and Tsunangiri, paulownia produced in Tsunan district in Niigata Prefecture.
Among them, Aizu district is said to have been the place where paulownia planting began. Since large-scale paulownia afforestation occurred there in the Meiji period, paulownia raw woods have been actively shipped as farmers’ side business. Based on this background, Mishima Town founded Aizukiritansu Corporation (meaning a corporation for Aizu Japanese traditional chests made of paulownia), co-funded by the town and the private sector in the early 1980s, when the demand for paulownia timbers decreased. Since then, the town has trained craftsmen and developed new products and markets. These days, it allocates “Kiri (paulownia) experts” and plants paulownia saplings, manages planting, makes manuals for paulownia planting, and conducts various other activities.
Paulownia trees grow quickly and become ready for timbering in approximately 30 years. Meanwhile, they require intensive work including mowing undergrowth, fertilization, and disinfection. It was said to be a reason why people planted paulownia trees near their houses and took sufficient care of them. Now, approximately 900 paulownia trees are planted and managed by the town. It requires special know-how unique to paulownia trees such as a wider space required between each tree than Japanese cedar trees and efforts against damages by pests and rats. The town not only keeps striving toward a stable supply of paulownia timbers, but also proposes new types of chests suitable for the modern life and develops completely new products such as chairs and butter cases.
Markets for domestic timbers including paulownia have been shrinking. Both the demand and supply of lumbers especially used for further niche fields of intangible cultural heritage have been shrinking drastically. Thus, we face a greater risk of being unable to obtain suitable materials when necessary. The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) will strive to enlighten larger audiences about the efforts necessary for planting, managing, and processing timbers including paulownia, at a reasonable value for its price, to liaise among production regions, craftsmen, and consumers, and to elucidate raw material characteristics from the scientific study. We will continue to work on this.