2013 Fiscal Year Final Research Report

Development of new cambial marking method by using high DC volage pulse.

Research Project

Project/Area Number	23658127
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Forest science
Research Institution	Kyoto University
Principal Investigator	OKADA Naoki 京都大学, 地球環境学堂, 准教授 (40335302)
Co-Investigator(Kenkyū-buntansha)	SEINO Tatsuyuki 筑波大学, 大学院・生命環境科学研究科(系), 准教授 (40362420)
Project Period (FY)	2011 – 2013
Keywords	熱帯樹木 / 成長輪 / 形成層 / 高電圧パルス
Research Abstract	DC high voltage pulse was applied to tree cambium to develop an effective cambial marking method for estimating tree growth of ring-less tropical trees. In addition, bio-impedance of tree cambium was also monitored for estimating seasonal changes of cambial activity. Temperate tree species formed abnormal cells and tissues by treating 300-500 v. The degree of abnormal tissue formation was different by species, but common features were observed as follows: (1) formation of thick-walled vessel element and wood fibers, (2) increase in tangential row of ray cells, and formation of abnormal-shaped ray parenchyma cells, and (3) formation of colored-substances in parenchyma cells. The value of impedance showed seasonal changes, probably reflecting the difference of cambial activity.

(4 results)