Growth and survival of <Emphasis Type="Italic">Abies sachalinensis</Emphasis> seedlings for three years after selection harvesting in northern Hokkaido,Japan |
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Authors: | Toshiya Yoshida Mahoko Noguchi |
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Institution: | (1) Uryu Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido University, Moshiri, Horokanai, Hokkaido 074-0741, Japan;(2) Shikoku Research Center, Forestry and Forest Products Research Institute, 2-915 Asakuranishimachi, Kochi 780-8077, Japan |
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Abstract: | Previous studies have indicated that recruitment of Abies sachalinensis, a representative conifer species of northern Japan, decreased following single-tree selection harvesting in stands with
dense dwarf bamboo understory. We tested the hypothesis that growth and survival of A. sachalinensis seedlings are reduced by canopy opening in that type of stand. A 0.75 ha study plot was examined, and all the seedlings (defined
as trees with height 0.5–2 m) were identified and their shoot extensions measured for three years after single-tree selection
harvesting (26% intensity in terms of basal area). The leader extensions of A. sachalinensis seedlings that experienced canopy opening were greatly improved. However, a negative effect on survival was also apparent;
nearly 40% of seedlings died at the sites that experienced canopy opening. These results were supported by generalized linear
models that examined variations of local harvesting intensity for individual seedlings. Despite the ability of A. sachalinensis to respond rapidly to exposure, some physiological stresses may have appeared, and presumably were amplified by co-occurring
dwarf bamboos. With regard to the low seedling density (156 stems ha−1), common in this type of stands, local harvesting intensity in the selection system should be reduced to maintain survival
of advanced regeneration, thus sustaining stand structure and composition. |
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