Determining ages of conifer trees with resistance microdrilling.

Autor: Xu, Pengfei1,2 (AUTHOR) xupengfei.nick@foxmail.com, Houjiang, Zhang1,2 (AUTHOR) hjzhang6@bjfu.edu.cn, Zhenbo, Xin1,2 (AUTHOR) zb_xin6@163.com, Fenglu, Liu3 (AUTHOR) liufenglu39@fafu.edu.cn, Haiou, Song4 (AUTHOR) 124423939@qq.com, Jiangyu, Yuan5 (AUTHOR) 568165167@qq.com
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Zdroj: Canadian Journal of Forest Research. 2024, Vol. 54 Issue 3, p268-277. 10p.
Abstrakt: This study verified the potential for determining the age of conifer trees using resistance microdrilling. A laboratory investigation, comparison of resistance microdrilling and counting branch whorls, and dating of old trees in a historic heritage site were conducted in this study. Two methods were proposed to determine the drilling path for resistance microdrilling. The results showed that resistance microdrilling is suitable for non-destructive testing (NDT) of living conifer trees. Moreover, the drilling path deviation must not exceed 15° to obtain reliable results. The absolute detection error of resistance microdrilling was within ± 3 years for young trees (age < 40 years old), within ± 5 years for old trees, and the relative error for all trees was less than 10%. The two methods for determining the drilling path proposed in this study are recommended for aligning the needle with the pith. For trees with a DBH exceeding the range of a resistance microdrill, the pith and age may be determined by using a "two-way drilling" in a forward and then reverse direction. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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