49 九州産主要樹種の実験生態学的研究(第4報) : 飫肥地方のスギ各品種の樹液の屈折率の差異に就て
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1. On the point of experimental and ecological researches, some studies were carried out upon the relation of refractive index of the expressed plant tissue bluids of the various Sugi trees (Criptomeria japonica Don.) growing in Obi region.2. As materials, the 18 years-old Cryptmeria trees growing in the Otono national forest, Obi divisional national forest office, where is seen to keep a uniform condition of soil and environment, were taken by the new-grown shoots and leaves of biennial branches of each top-trees, at 10 O'clok about 18 th day of every month.3. The expressed plant tissue bluids was expressed by means of the hydraulic press giving about 300 kg per sq.m.4. The determination of the refractive index was performed by the Abbe refractmeter with the Shimadu's heating apparatus at temperature of 18℃ and 20℃.5. As the seasonal variation of refractive index, it is low in the initial period of development, becomes gradually higher during the period of maximum growth, increased rapidly in the arrest or resting period, showing the maximum value in February, and then declines suddenly in March.6. The lower value of index in July is likely due to the fact that sampling was taken at a short interval of clear weather during along rainy period, and now it may indicate that it is the maximum and optimum conditions for the most active development in the respective periods of growth.The same results were seemed in September and November.7. The rapid increase in refractive-index from December towards February is due to the fact that a continued dry period in this region and lower water content of soil brought to a decrease of water in plant and an increase of reserving nutritive substances as sugars.8. Summerizing thes results, the types of monthly variation of refractive index are classified as follows : 1. Aka type 2. Tosaaka, Karatsuki, Edanaga type 3. Garin, Hidarimaki type 4. Kuro, Tosaguro, Haara type 5. Chirimentosa type 6. Measa type 9. The results obtained are to be concluded by the discussion, basing on other results of still more extensive and physiological experiment, and it will be represented in another publication.
- 一般社団法人日本森林学会の論文
- 1951-09-25
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