THE JOURNAL OF THE JAPANESE FORESTRY SOCIETY
Online ISSN : 2185-8195
Print ISSN : 0021-485X
ISSN-L : 0021-485X
Studies on the pulp of “Akamatsu” (Pinus densiflora S. et Z.) wood
(1) On the length, diameter and the length/diameter ratio of tracheids in Akamatsu (Pinus densiflorv S. et Z.) wood
Katsumi HATA
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1950 Volume 32 Issue 1 Pages 1-7

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Abstract
The author measured the length and the radial diameter of tracheids in “Akamatsu” wood, and from these data calculated the length/diameter ratio of them. Five trees which grew in the natural forest in Kagawa Prefecture were selected for the material of investigation. In order to measure the size of tracheids two methods were emloyed:
(1) maceration method for the measurment in the length of tracheids (II) section method for it in the diameter of them.
The principal results are, in substance, as follows.
I. Not only in the length of tracheids but also in the diameter and legth/diameter ratio of tracheids, the variations of these data are considerably regular.
II. The variation in the diameter and the leggt/diameter ratio of tracheids are found to be in conformity with the variations in the length of them.
III. The tracheids of the stems are longer and wider in length and diameter than those of the branches, there is the same relation also between thick branches and slender ones.
IV. Rapidly growing trees are longer and wider in length and diameter' of tracheids than slowly growing ones, and the length/diameter ratio of tracheids in the former are larger than that in the latter.
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