11 アカマツの樹斡, 枝條に於ける生材含水率, 比重, 体積収縮率及春秋材別の比重, 生材含水率等について

概要

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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 : [table] 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 : [table] 4) The relation between the percentage summerwood (A) and the specific gravity (weight oven-dry, volume volume oven-dry) (S_0) is represented theoretically by following linear equation : S_0=0.333+0.374×A/100
一般社団法人日本森林学会の論文
1951-01-25