Spatial variation in tree seedling density after the site preparation for planting in a cleared coniferous plantation in Hokkaido,northern Japan |
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Authors: | ChangSeob Shin Masato Shibuya |
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Affiliation: | (1) Laboratory of Silviculture, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;(2) Present address: College of Agriculture, Chungbuk University, Cheongju Chungbuk, Korea |
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Abstract: | To study spatial variation in natural tree seedling density and the relationship between variation in seedling density and seed dispersal mode at a cleared site, we surveyed natural tree seedlings after the site preparation for planting in a coniferous plantation cleared by a typhoon disturbance in 2004. The site was located near Sikotsuko Lake, Hokkaido, northern Japan. Twenty-five tree seedling species were found and the mean seedling density was 9.8 seedlings/m2. Seedlings of non-animal-dispersed species (7.2 seedlings/m2) were approximately five times more abundant than those of animal-dispersed species (1.4 seedlings/m2), and 87% of all seedlings were current. The seedling density of non-animal-dispersed species (almost all wind-dispersed) decreased with distance from a natural forest; however, this trend did not hold for animal-dispersed species (almost all bird-dispersed). The spatial variation in seedling density was lower in animal-dispersed species than in non-animal-dispersed species. Seed dispersal patterns and the viability duration of buried seeds likely affected the variation in seedling density by seed dispersal mode. |
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Keywords: | Cleared site Occurrence frequency Seed dispersal Seedling density Tree species |
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