| Project/Area Number |
12460071
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
IMADA Morio KYUSHU UNIV, AGRICULTURE, PROFESSOR, 大学院・農学研究院, 教授 (60038338)
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| Co-Investigator(Kenkyū-buntansha) |
TERAOKA Yukio KAGOSHMA UNIV., AGRIC, ASSOCIATE PROFESSOR, 農学部, 助教授 (40264105)
OKANO Tetsuo KYUSHU UNIV, AGRIC, ASSOCIATE PROFESSOR, 大学院・農学研究院, 助教授 (00194374)
YOSHIDA Shigejiro KYUSHU UNIV, AGRIC, ASSOCIATE PROFESSOR, 大学院・農学研究院, 助教授 (80128462)
KUNISAKI Takashi IWATE UNIV, AGRIC., LECTURER, 農学部, 講師 (00292178)
MIZOUE Nobuya MIYAZAKI UNIV., AGRIC, LECTURER, 農学部, 講師 (00274522)
INOUE Akio TOTTORI UNIV, AGRIC., ASSISTANT PROFESSOR (80304202)
MURAKAMI Takuhiko KYUSHU UNIV, AGRIC, ASSISTANT PROFESSOR (20332843)
井上 晋 九州大学, 農学研究院, 助教授 (20038342)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2000: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | Japanese Oak / High quality timber production / Silvicultural system / Forest management system / Clear-cutting system / Rotation |
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| Research Abstract |
In April 1972, an experimental management system for Japanese oak (Quercus mongolica var. grosseserrata) was established in a natural Japanese oak forest, approximately 200 ha in area, in the Kyushu University Forest in Hokkaido. The management system was imposed by dear-cutting system in tongue-shaped blocks surrounded by shelterbelts. Rotations were 150 years and cutting blocks for staggered annual cutting were set up. The natural stands containing these blocks have been managed by a silvicultural process designed to produce high-quality timber from Japanese oak. The results obtained for 30 years between 1972 and 2001 (the first, second and third periods) are follows;.
1) The number of first-year oak seedlings established by regeneration process per ha varied widely-from 5,000 (in 2001) to 133,000 (in 1974); it averaged 55,500. Such variation was due to noted variations in size of seed crop for natural forests of Japanese oak. 2) When the stands established by the regeneration process
… More
developed into near the 15-year-old stand, vertical stratifications were distinguished in the canopy on the same manner as the above established stands. 3) In the 15- to 22- year-old stand, the height of the upper oak trees seemed to be somewhat lower than the one of the upper trees progressing with wide variations. 4) In the established stands by the regeneration process from 15- through 29-year-old, whereas the DBH of the upper trees was varied between the 15- and 21-year-old stand, the diameter growth was nearly constant (approximately 5 mm per year) in the 21- through 29-year-old stands. 5) In the 35- to 57-yearold stand, the stand volume of the upper trees seemed to increase with an increase in stand age progressing with wide variations. 6) The average net annual revenue for the 30-year period was 335,000 yen, an amount calculated by subtracting the average cost per year (557,000 yen) from the average revenue per year (892,000 yen).
Investigating the profitability of this applied management system and improving its shortcomings will require that the experiment be continued over a long period. Less
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