| Abstrakt: |
AbstractNaturally regenerated trees in young Cryptomeria japonicaplantations were investigated in 141 quadrats of 10 × 50 m within a watershed of 1,000 ha, and factors affecting their composition and abundance were examined. The species composition of naturally regenerated trees was classified into four types. Dominant species were Swida controversa, Magnolia hypoleucaand Pterocarya rhoifoliain Type A1, Betula maximowicziana, M. hypoleuca, Quercus crispulaand Castanea crenatain Type A2, Q. serrataand C. crenatain Type B1, and Pinus densiflorain Type B2. The results of path analysis showed significant influences of previous forest type and geology among the factors that correlated with the species composition of naturally regenerated trees; previous forest type in particular showed a higher absolute path coefficient value. Species composition types of naturally regenerated trees corresponded to the previous forest types: Types (A1 and A2) corresponded to the natural forests composed of Thujopsis dolabratavar. hondai, Fagus crenata, Aesculus turbinata, etc., Type B1 corresponded to the secondary Q. crispulaand Q. serrataforest, and Type B2 corresponded to the secondary P. densifloraforest, respectively. The abundance of naturally regenerated trees was strongly affected by geology; i.e., plantations on soft-sedimentary dacitic tuff contained great amounts of colonizing P. densifloratrees. |
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