| Project/Area Number |
16380108
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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・森林工学
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
MAKITA Akifumi Akita Prefectural University, Dept of Bioresouroe Sciences, Professor (60315596)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIWAKI Aya Miyazaki University, Dept of Agriculture, Professor (60228244)
SUZUKI Jun-ichiro Tokyo Metropolitan University, Dept of Biological Science, Associate Professor (00291237)
SUYAMA Yoshihisa Tohoku University, Graduate school of Agricultural Science, Associate Professor (60282315)
SAITOH Tomoyuki Forestry and Forest Products Research Institute, Kiso-Research Branch, Researcher (00414483)
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| Project Period (FY) |
2004 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥15,700,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥600,000)
Fiscal Year 2007: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2006: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2004: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | clonal plants / Sasa / mass flowering and death / regeneration process / microsatellite / clonal structure / demography / DNA analysis / クローン動態 / 地下茎 / 一斉開花 / 超寿命一回繁殖性植物 |
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| Research Abstract |
The present study aimed to clarify how long does it take from seedling emergence to the full recovery of Sasa population after mass flowering, with special reference to the clone dynamics in the regeneration process. Mass flowering and death of Sasa population is known to be an important episodic event in the forest vegetation dynamics in Japan.
Our research sites are as follows : 1) Togakushi (Nagano Pref.) ; Sasa kurilensis flowered in 1974. 2) Hakkoda (Aomori Pref. ) ; S. kurilensis flowered in 1979, 3) Towada (Akita Pref.) ; S. kurilensis flowered in 1995, and 4) Oomi (Kyoto Pref) S.veitchii var. firsuta flowered in 2007.
Main results are as follows :
1) Isolation and characterization of microsatellite loci for several Sasa species, and analyzing of clonal structures of Sasa populations in the regeneration process.
2) Exploitation of a demographic research method for clarifying the clone dynamics during the regeneration process.
We studied the dynamics of Sasa juvenile population with DNA analysis and clarified that the self-thinning process had been continued even in the 20-year old S. kurilensis juvenile population. So, it confirmed that it takes more than 20 years from seedling emergence to the full recovery of Sasa population after mass flowering.
3) The changes in clonal structures during the regeneration process.
By the research in a 10-years old juvenile population and the non-flowered full size stage population for S. kurilensis in Towada Site, we found that the growth of Sasa juveniles were affected by the light conditions determined by the canopy conditions and that the full-sized S. kurilensis population was composed with the very large clones, up to 2500 m^2. During the regeneration process, a few large genets grown in the good light cognitions like canopy gaps are presumed to become dominant in the future.
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