This data is the result of an identification study of Jomon-era Toxicodendron trichocarpum by Professor Mitsuo Suzuki of the Botanical Garden, Tohoku University. It describes changes in the diameter of the vessels in the earlywood and latewood portions of the annual rings.
Compared to the previous graph of the lacquer tree, the differences in the vascular system of the earlywood parts of the Toxicodendron trichocarpum and the lacquer tree can be clearly seen.When superimposed, the graphs look like this.The diameter of the vessels of mountain poison ivy varies almost constantly with the age of the tree.
When buried in the soil for a long time, the bark rarely remains and wood only remains in special environments such as peat layers. For this reason, it has been difficult to determine the identification of lac tree and Toxicodendron trichocarpum in wood excavated from archaeological sites. However, by using a new technique, DNA analysis,it is now possible to clearly identify the differences between Chinese and Japanese lacquer trees, which are also members of the same lacquer family.
For important woods, that level of analysis is necessary. Past articles
