Site preference and occurrence patterns of <Emphasis Type="Italic">Picea jezoensis</Emphasis> and <Emphasis Type="Italic">Abies sachalinensis</Emphasis> on decayed logs in natural coniferous forests in Hokkaido,northern Japan |
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Authors: | Keisuke Yano Masato Shibuya |
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Institution: | (1) Graduate School of Agriculture, Hokkaido University, Sapporo Hokkaido, 060-8589, Japan;(2) Present address: Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Ishi 3809-1, Juo Town, Hitachi Ibaraki, 319-1301, Japan |
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Abstract: | The objectives of this study were to investigate differences in the site preferences of seedlings of Picea jezoensis and Abies sachalinensis on decayed logs, and to examine the occurrence patterns of seedlings and saplings of the two species and whether they occur
together or separately on logs. We characterized the habitats of 1–2-year-old seedlings of the two species on logs and examined
the relationship of the two species on logs by growth stages in two plots. One plot had been disturbed about 50 years ago
whereas the other had not for a long time. Although the thickness of moss and the litter layer in the habitats of 1–2-year-old
seedlings were significantly different between the two species, the two species could occur together. In one study plot, seedlings
and saplings of the two species occurred together. The initial occurrence pattern of the seedlings affected the occurrence
patterns of the saplings on logs. The occurrence patterns of the seedlings and saplings of the two species on logs seemed
to be affected by the abundance of seed trees. In the other study plot saplings of the two species occurred separately, but
one species was not always competitively superior to the other species. Disturbance history affected the occurrence patterns
of the saplings of the two species on decayed logs at the two study plots. Consequently, it is concluded that seed dispersal
and the abundance of available logs, which are usually affected by disturbance, are significant factors in the natural regeneration
of conifers in Hokkaido. |
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Keywords: | |
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