TY - JOUR
T1 - Effect of height-to-diameter ratio on stem stiffness of sugi (Cryptomeria japonica) cultivars
AU - Kijidani, Yoshio
AU - Hamazuna, Tetsuya
AU - Ito, Satoshi
AU - Kitahara, Ryushi
AU - Fukuchi, Shinsuke
AU - Mizoue, Nobuya
AU - Yoshida, Shigejiro
N1 - Funding Information:
Acknowledgments We thank the Miyazaki-nanbu district forest office, Forestry Agency, for use of the experimental plots for plantation spacing. This research was financially supported by a Grant-in-Aid for scientific research from the Ministry of Education, Culture, Sports, Science and Technology (no. 16780128).
PY - 2010/2
Y1 - 2010/2
N2 - The lumber from sugi plantations in Japan displays large intra- and intertree variation in mechanical properties, even within a stand. These variations seem to be induced by the effects of the characteristics of cultivars as well as the effects of growth traits on mechanical properties. Therefore, the effects of growth traits on mechanical properties per cultivar need to be precisely examined. In this study, we focused on the effects of growth traits, especially height-to-diameter ratio (H/D ratio), on stem stiffness per cultivar. Sixteen cultivars were classified into three groups according to the relationships between stem stiffness and growth traits. In cultivars that showed a close correlation between growth traits and stem stiffness, it was assumed that stem stiffness could be controlled to a certain extent by silvicultural practices using the H/D ratio as an indicator. In cultivars that showed a weak correlation between growth traits and stem stiffness, selecting cultivars for the production of logs with higher mechanical properties seemed to be effective; in this study, Kumotoshi, Tanoaka, and Edanaga were found to be suitable. Tree age and site index may be important factors for producing wood with higher mechanical properties.
AB - The lumber from sugi plantations in Japan displays large intra- and intertree variation in mechanical properties, even within a stand. These variations seem to be induced by the effects of the characteristics of cultivars as well as the effects of growth traits on mechanical properties. Therefore, the effects of growth traits on mechanical properties per cultivar need to be precisely examined. In this study, we focused on the effects of growth traits, especially height-to-diameter ratio (H/D ratio), on stem stiffness per cultivar. Sixteen cultivars were classified into three groups according to the relationships between stem stiffness and growth traits. In cultivars that showed a close correlation between growth traits and stem stiffness, it was assumed that stem stiffness could be controlled to a certain extent by silvicultural practices using the H/D ratio as an indicator. In cultivars that showed a weak correlation between growth traits and stem stiffness, selecting cultivars for the production of logs with higher mechanical properties seemed to be effective; in this study, Kumotoshi, Tanoaka, and Edanaga were found to be suitable. Tree age and site index may be important factors for producing wood with higher mechanical properties.
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U2 - 10.1007/s10086-009-1060-2
DO - 10.1007/s10086-009-1060-2
M3 - Article
AN - SCOPUS:76649125203
SN - 1435-0211
VL - 56
SP - 1
EP - 6
JO - Journal of Wood Science
JF - Journal of Wood Science
IS - 1
ER -