Regeneration process of coniferous forests in northern Hokkaido I.Abies sachalinensis forest andPicea glehnii forest |
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Authors: | Eizi Suzuki Kasio Ota Tsuneo Igarashi Koichiro Fujiwara |
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Institution: | (1) Biological Institute, College of Liberal Arts, Kagoshima University, 890 Kagoshima, Japan;(2) 13-2-601 Midorimachi Makomanai Minami-ku, Sapporo 061-21, Japan;(3) Department of Forestry, Faculty of Agriculture, Hokkaido University, 060 Sapporo, Japan;(4) Experiment Forest, Faculty of Agriculture, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | Regeneration of natural forests was studied in the Nakagawa Experiment Forest of Hokkaido University using age distribution
surveys made by the clear felling method. In Plot 1 (30 m × 65 m),Abies sachalinensis dominated the canopy layer but there were also a fewBetula ermanii trees.Sasa senanensis densely covered the forest floor. Most of the canopy trees were from 122 to 195 years old. Seedlings younger than 50 years
old ofA. sachalinensis were found on fallen logs and root bases. There were, however, few trees from 50 to 120 years old. The present canopy trees
seemed to have regenerated after competitive pressure from old canopy andSasa disappeared 180 years ago. Plot 2 (50 m × 100 m) on serpentinite soil was dominated byPicea glehnii. Sasa kulirensis covered the floor but not as densely asS. senanensis in Plot 1. The ages ofP. glehnii ranged from 1 to 586 years old, and the age distribution ofA. sachalinensis was L-shaped. A small gap in the canopy formed about 290 years ago, and it gradually extended. Conifers regenerated continuously
in the extending gap butB. ermanii did not. One hundred thirty years ago, part of Plot 2 was again destroyed andA. sachalinensis andB. ermanii regenerated. Thus, two types of regeneration were found. One regenerated both conifers andBetula after a sudden disturbance of canopy layer or death ofSasa, and the other, under an extending gap, regenerated only conifers. |
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Keywords: | Climax forest Conifer Forest regeneration Tree age |
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