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KMID : 0613820180280111262
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Journal of Life Science
2018 Volume.28 No. 11 p.1262 ~ p.1267
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Spatial Distribution Patterns of Oplismenus undulatifolius var. undulatifolius on Mt. Hanwoo in Korea
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Huh Man-Kyu
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Abstract
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The patchiness of local environments within a habitat is assumed to be a primary factor affecting the spatial patterns of plants. In this study, a randomization procedure was developed to test the null hypothesis that only spatial association with patches determines the spatial patterns of plants. Oplismenus undulatifolius (Ard.) P. Beauv. var. undulatifolius is an herbaceous plant and a member of the genus Oplismenus in the family Poaceae. Oplismenus hirtellus subsp. undulatifolius occurs in temperate, subtropical, and tropical areas of the world. The spatial pattern of O. undulatifolius var. undulatifolius was analyzed using dispersion indices in different sizes of plots according to several patchiness indexes, population uniformity, or aggregation . Population densities (D) at Mt. Hanwoo varied from 0.453 to 4.375, with a mean of 2.387. The small and mid-sized plots (2 m × 2 m, 2 m × 4 m, 4 m × 4 m, 4 m × 8 m, and 8 m × 8 m) of O. undulatifolius var. undulatifolius were aggregated in the forest community. However, O. undulatifolius var. undulatifolius was uniformly distributed in three large plots (8 m × 16 m, 16 m × 16 m, and 16 m × 32 m). The greatest mean crowding (M*) and patchiness index (PAI) showed positive values. Aggregation is mainly caused by environmental factors. Many plants on Mt. Hanwoo are being disturbed by climbers, which is preventing these plants from inhabiting their realized niches on Mt. Hanwoo.
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KEYWORD
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Mt. Hanwoo, Oplismenus undulatifolius var. undulatifolius, patchiness index, spatial distribution
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