THE JOURNAL OF THE JAPANESE FORESTRY SOCIETY
Online ISSN : 2185-8195
Print ISSN : 0021-485X
ISSN-L : 0021-485X
Research on specific gravity, water content in the green condition, volumetric shrinkage for trunk and branches and the specific gravity, water content in the green condition, volumetric shrinkage of the springwood and summerwood of Japanese red pine (Pinus desiflora s. et Z.)
Kamekichi YAZAWAShigeru TATEHirotoshi IWATA
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1951 Volume 33 Issue 1 Pages 34-39

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Abstract
A Japanese red pine of 35cm d. b. h. and of 63 years old with well formed crown was chosen from the natural forest at the Kuraiyama University Forest of Gifu university, Ono-district, Gifu Pref.
146 small samples were taken from the disks of trunk and 38 samples from two branches. These samples were weighed by a balance and their volumes were determined separately in a Breiul mercury volumeter in both green and ove-dry condition.
The results may be summarized as follows:
1) The mean values of specific gravity, moisture content, volumetric shrinkage etc. of trunk and branch wood were as follows:
2) Specific gravity (weight oven-dry, volume oven-dry) of Japanese red pine definitely decreases from butt to top.
3) The mean values of specific gravity, moisture content, volumetric shrinkage etc. of springwood and summerwood of the trunk were as follows:
4) The relation between the percentage summerwood (A) and the specific gravity (weight oven-dry, volume volume oven-dry) (S0) is represented theoretically by following linear equation:
S0=0.333+0.374×_??_
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© The Japanese Forest Society
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