1996 Fiscal Year Final Research Report Summary
Alkalization and Its Causative Materials of Sugi Black-Heartwood
| Project/Area Number |
07660224
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林産学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
ODA Kazuyuki KYUSHU UNIVERSITY,FACULTY OF AGRICULTURE,ASSOCIATE PROFESSOR, 農学部, 助教授 (10045130)
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| Project Period (FY) |
1995 – 1996
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| Keywords | sugi heartwood / red-heartwood / black-heartwood / alkali / ash / potassium ion |
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| Research Abstract |
Ash contents were ca.0.5% in the typical red-heartwoods having lightness values of 65 or more, and ca.1.0% in the typical black-heartwoods having lightness values of 50 or less. As a result high correlations between ash contents and lightness in heartwoods were recognized. The pH values of typical black-heartwood showed weak alkali, although the values of normal red-heartwoods indicated weak acid. On the other hand, total contents of potassium, calcium, magnesium and sodium were more in black-heartwood than in red-heartwoods. This suggested that heartwood of sugi was alkalized when the accumulation of these matal ions in the heartwood exceeded the permitted amount.
There was a significant correlation between ash content and potassium content in heartwood. Lightness values of heartwood were constantly high with low potassium content, However the values decreased as potassium content increased. They were then constantly low with high potassium content.
Ash content in the heartwood varied among cultivars. It was significantly correlated to diameter at breast height within a cultivar in the same stand. The amount of inorganic matters absorbed in heartwood was affected by hereditary factors and locational conditions or environmental factors to diameter growth. However it is thought that the degree of impact of environmental factors on alkalization of heartwood varied among cultivars.
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[Publications] MORIKAWA,T., ODA,K., MATSUMURA,J., TSUTSUMI,J.and KII,H.: "Heartwood Properties of Sugi (Cryptomeriajaponica) : Moisture Content in green condition, lightness, ash content and hot water extractives of cultivar Yabukuguri" BULLETIN OF KYUSHU BRANCH OF JAPANESE FORESTRY SOCIETY. No.48. 195-196 (1995)
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