京都府和知産スギ間伐木の材質

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  • 京都府和知産スギ間伐木の材質(林学部門)
  • キョウトフ ワチサン スギカン バツボク ノ ザイシツ
  • Physical and mechanical properties of thinned wood of Sugi grown in Wachi district, Kyoto Prefecture(Forestry)

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Physical and mechanical properties of Sugi (Cryptomeria japonica D Don) produced by thinning of an artificial forest in Wachi district, Kyoto Prefecture, were determined according to Japanese Industrial Standards. Results obtained are as follows; 1) Average width of anual ring was narrow in comparison with that of general thinnings of Sugi. Average specific gravity in air dry condition was 0.40. This value was considerably higher than that of general thinnings and slightly higher than the basic value of mature wood (Table 2). 2) Average of bending strength, modulus of elasticity in bending and compressive strength was respectively stronger than the basic strength in mature wood (Table 2). However, the lower 95% confidence limits of these values were greatly reduced because of the large variation (σ_b : 481,E_b : 48×(10)^3,σ_c : 243kg/(cm)^2). These limits were smaller than that of the basic strength in mature wood. A linear relationship was obtained between the strength and the specific gravity (Figures 2 and 3). 3) Location of specimen on a cross section of wood had influence upon the specific strength (Table 3). The specific strength of the specimen in outer zone (location 1 and 4 in Figure 1) was stronger 8 to 30% than that of inner zone (location 2 and 3 in Figure 1). Effect of location in height of tree trunk on the specific strength was only a few in the range of this experiment (Fig. 5). 4) Shrinkage in radial and tangential direction of the thinnings was similar to that of mature wood (Table 4).

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