| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Research Abstract |
A coppice stand which had been utilized intensively contained lower densities in canopy tree species. Furthermore, specie, size and age compositions, and also the reproductive origins, such as coppice and/or seed, are various in each coppice stand. Therefore, coppice stands can not be converted into high forests by common practics.
Firstly, we focussed on the early regeneration phase in the gaps which allow several species to coexist. The dispersion pattern and also size and age structure of saplings were analyzed in concerning with the light environments in natural mixed forest.
Japanese cedar which mainly established contagious around the stumps and on disturbed soil due to uprooting stumps. Beech regenerated on the soil contagious but intra-clump was rather uniform. The mounds which were created by uprootings provide a good habitat for A.turbinata escaping form suppression of dwarf bamboo.
Natural regeneration systems are typically multi-species. In the restoring system, we have to consider the differences of ecological traits of seedlings and saplings revealed in natural forests. They should be applied to multi-spscies regeneration in practical forestry.
Next, we clarified the relation between canopy development and stem growth patterns in restoring process of beech/oak secondary forest. As a result, we recommended that thinning in coppice stand should be done where the stem with small crown converged. If the high-quality stems are not exist in a small crown convergence, group cutting may be a suitable method. In this case, group size should be connected with the estimated size of small crown convergence. It will bring un-evenaged structure to the secondary forests.
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