Effects of previous forest types and site conditions on species composition and abundance of naturally regenerated trees in young <Emphasis Type="Italic">Cryptomeria japonica</Emphasis> plantations in northern Japan |
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| Authors: | Hisashi Sugita Takashi Kunisaki Takeyasu Takahashi Ryoichi Takahashi |
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| Institution: | (1) Tohoku Research Center, Forestry and Forest Products Research Institute, Morioka Iwate, 020-0123, Japan;(2) Department of Environmental Sciences for Sustainability, Faculty of Agriculture, Iwate University, Morioka, Japan;(3) Field Science Center, Faculty of Agriculture, Iwate University, Shizukuishi, Iwate, Japan |
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| Abstract: | Naturally regenerated trees in young Cryptomeria japonica plantations 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 hypoleuca and Pterocarya rhoifolia in Type A1, Betula maximowicziana, M. hypoleuca, Quercus crispula and Castanea crenata in Type A2, Q. serrata and C. crenata in Type B1, and Pinus densiflora in 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 dolabrata var. hondai, Fagus crenata, Aesculus turbinata, etc., Type B1 corresponded to the secondary Q. crispula and Q. serrata forest, and Type B2 corresponded to the secondary P. densiflora forest, 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. densiflora trees. |
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| Keywords: | Conifer plantations Naturally regenerated trees Previous forest type Site conditions Species composition |
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