53 サワラ材に関する研究(第1報)
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This is a part of report on the anatomical properties, which we researched for the wood of "Sawara" Chamaecyparis pisifera, in Tochigi-Prefecture. I Materials and Methsds of research [table] We picked pieces of wood from the part of 2m in stom from the ground on each material, aud tried microscopic examination of these preparations. II Results ofresearch and considerations. 1. On Ray a. Rays are in single file commonly, and cells of one Ray are 1〜26 in number. Rays consisting of 2 cells are most numerous. Rays contained in tangential cross-sectional area per sguare cm are 6683^^〜 in number. b. Rays increase in height according to the increasing of their cells. In the case of Ray consisting of one ccll, mean height of the cell is largest (21.2μ), but Ray consisting of plural cells, it has the tendency of that the more cells increase the more mean height decreases. The largest of cells is 25.1μ in height, and the smallest is 13.8μ. c. Width : In regard to the widths of cells constructing one Ray, the cell existing in the middle part of Ray in height is the widest, usually, and the nearer the cell exists to the both sides, the smaller its width becomes. The width of middle part of the Ray, consisting of one cell, is smallest, and that of the Ray, consisting of plural cells, increases according to the increasing of the number of it's cells. The largest width of the middle parts of Rays is 12.0μ, and the smallest is 6.5μ. d. The cross-sectional area of one Ray increases in proportion to the inerease of cell number. Percentage of Ray area to the tangential cross-sectional area is about 3.45% Total area of Rays consiting of 2〜6 cells is 66% of the total area of all Rays. 2. On relations botween the width of annual ring and Tracheid. a. In the case of the smallest width (112μ) of annual ring, the width of summer wood is 33.7% of the width of annual ring, and that of spring wood is 64.3%, but in proportion to the increasing of annual ring width, percentage of the width of summer wood decreases to 7〜8%, and that of the width of spring wood increases to 92〜93%. b. In the case of 112μ width of annual ring, both spring wood and summer wood consist of 4 cells, but in the other cases the number of cells constructing summer wood decreases to 17〜19% of the number of cells constructing annual ring and that of spring wood increases to 81〜83% according to the increasing of annual ring width. c. The increasing percentage of the radial diameter of cell with increase of the annual ring with, is a little both in spring wood and summer wood. In the case of that the annual ring width decreases less than 400μ, the radial diameter of spring wood decreases exceedingly but the radial diameter of summer wood is nearly unchangeable. The largeest radial diameter of spring wood is 46μ, and the smallest is 14μ, the largest of summer wood is 22μ and the smallest is 4μ.
- 日本森林学会の論文
- 1950-09-25
著者
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