Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Spatial Distribution Patterns of Oplismenus undulatifolius var. undulatifolius on Mt. Hanwoo in Korea

한우산에 분포하는 주름조개풀의 공간적 양상

  • Huh, Man Kyu (Division of Applied Bioengineering, Dong-eui University)
  • 허만규 (동의대학교 바이오응용공학부)
  • Received : 2018.07.04
  • Accepted : 2018.11.17
  • Published : 2018.11.30
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Abstract

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 ($2m{\times}2m$, $2m{\times}4m$, $4m{\times}4m$, $4m{\times}8m$, and $8m{\times}8m$) of O. undulatifolius var. undulatifolius were aggregated in the forest community. However, O. undulatifolius var. undulatifolius was uniformly distributed in three large plots ($8m{\times}16m$, $16m{\times}16m$, and $16m{\times}32m$). 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.

국지적 환경에서 패치 분포 형태는 일차적으로 식물의 공간적 양상으로 나타나고, 임의화 과정은 패치를 결정하는 공간적 가설을 입증하는데 이용된다. 주름조개풀(Oplismenus undulatifolius (Ard.) P. Beauv. var. undulatifolius)은 Poaceae과 Oplismenus 속에 속하는 초본류이다. 이 종은 온대, 아열대, 열대에 분포한다. 이 지역의 주름조개풀이 일정한 분포인지 응집하는 분포인지 여러 패치 지표를 사용하여 분석하였다. 한우산의 집단 밀도는 0.453에서 4.375였으며 평균은 2.387이였다. 소형과 중형 프롯($2m{\times}2m$, $2m{\times}4m$, $4m{\times}4m$, $4m{\times}8m$, and $8m{\times}8m$)에서 주름조개풀은 응집형태를 보였다. 반면에 대형 플롯($8m{\times}16m$, $16m{\times}16m$, and $16m{\times}32m$)에서는 일정한 분포 양상을 나타내었다. 평균 응집 계수(M*)와 패치 지표(PAI)는 양의 값을 보였다. 응집은 여러 환경적 요인에 기인하는데 등산객들에 의해 방해되고 있었다. 따라서 주름조개풀은 이 지역에서 본래의 기본 생태적 지위를 누리지 못하고 있음을 보여주었다.

Keywords

SMGHBM_2018_v28n11_1262_f0001.png 이미지

Fig. 1. The curves of the patchiness index. Plot A (―): D ≥ 10 individuals/m2; Plot B (⋯): 10 individuals/m2 > D ≥ 5 individuals/m2; Plot C (— - —): D < 5 individuals/m2. D represents the average density of Oplismenus undulatifolius var. undulatifolius in plots.

SMGHBM_2018_v28n11_1262_f0002.png 이미지

Fig. 2. The mean aggregation number to find the reason for the aggregation of Oplismenus undulatifolius var. undulatifolius.

Table 1. Spatial patterns of Oplismenus undulatifolius var. undulatifolius individuals at different sampling quadrat sizes in Mt. Hanwoo

SMGHBM_2018_v28n11_1262_t0001.png 이미지

Table 2. Changes in gathering strength of O. undulatifolius var. undulatifolius at different sampling quadrat sizes

SMGHBM_2018_v28n11_1262_t0002.png 이미지

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