| Project/Area Number |
04660168
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Okayama University |
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Principal Investigator |
YAMAMOTO Shinichi Okayama University Fac.of Agriculture Associate Professor, 農学部, 助教授 (60191409)
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| Co-Investigator(Kenkyū-buntansha) |
CHIBA Kyozo Okayama University Fac.of Agriculture Professor, 農学部, 教授 (10036741)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Chamaecyparis pisifera / Ecological characteristics / Regeneration mechanism / Kiso district / Layring / Patch fomation / Gap / Natural regeneration method |
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| Research Abstract |
The occurrence pattern and size structure of clonal patches of Chamaecyparis pisifera (S.et Z.) ENDL., together with the substratum on which the patches were located, were investigated in a stand with a closed canopy (closed stand) and that with a canopy gap (gap stand) in an old-growth C.pisifera forest.Both sapling patches (patches with the height of the tallest foliage shoots <greater than or equal> 1.3m) and juvenile patches (those with that of <1.3m) occurred in both stands, and more abundant patches occurred in the gaps than in the closed stands.Size distributions of these patches were inverse J-shaped with more abundant smaller patches, and this was more typical for juvenile patches. Mean size of juvenile patches was significantly larger in the closed than in the gap stands, whereas larger sapling patches occurred more frequently in the gap stands.These patches occurred on various kinds of substrata and were more frequently on ground without litter, including rocks, in both stands. Patches occurred more abundantly under crowns of deciduous broadleaved trees in the closed stand, and in canopy gaps in the gap stands.They may expand horizontally by layning under insufficient sunlight conditions and may attain height growth under relatively strong sunlight conditions.Canopy gap formation that raises the sunlight level in the lower story plays an important role for the regeneration of C.pisifera from the clonal
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