Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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19 years of change in community structure of Quercus acutissima dominant stand on Mt. Danseok-san in Gyeongju national park, South Korea

경주 단석산 상수리나무 우점식분 군집구조의 19년간의 변화

  • Ko, Jae Ki (Department of Herbal Biotechnology, Daegu Haany University)
  • 고재기 (대구한의대학교 힐링산업학부 한약개발학전공)
  • Received : 2018.08.01
  • Accepted : 2018.08.12
  • Published : 2018.08.31
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Abstract

This study was carried out to clarify changes in community structure of Quercus acutissima dominant stand on the south slope of Mt. Danseok-san with fixed twenty quadrates. Five field surveys were conducted from Aug. 1999 to May 2018. During the period, the density lessened to 0.20 in 2012 comparing with 0.33 in 1999. However recent field study in 2018 showed moderate rising to 0.24. In 1999, the DBH class distribution of all trees formed reverse J curve. However, the reverse J curve was torn down, forming bell curve. In 2018, the curve showed similar shape of reverse J shape on the group of young trees, forming bell shape on the group of mature trees. It reveals that DBH 13cm is on the threshold of trees competition trend where the downtrend in the trees are on uptrend. The most dominant Q. acutissima formed bell curve. The peak of the curve shows the shift to the right of the graph as it gets lower by year.In case of Q. mongolica, shows a change in the shape of a low bell as the distribution curve increases. The oak stand in this study is in the process of changing from the initial stage of the secondary forest succession to the intermediate stage. The most dominant tree is Q. acutissima, and the sub-dominant tree is Q. mongolica in present. Considering the age distribution of the two competing tree species, the succession of this stand is expected to transfer to the Q. mongolica-dominant community.

본 연구는 경주 단석산 상부 남사면의 상수리나무 우점 식분의 군집구조 변화를 파악하기 위하여 고정 방형구 20개를 설치하고 1999년부터 2018년까지 5회의 매목조사를 실시하였다. 밀도는 1999년에 0.33에서 2012년에 0.20으로 감소하였으나 2018년에는 0.24로 다소 증가하였다. 전체 수목의 흉고직경계분포를 보면, 1999년에는 역J자 유사한 모양의 분포를 나타내었으나 그 후 분포가 변화되어 2018년에는 어린 개체들에서는 역J자 모양이, 성숙한 개체들에서는 종 모양이 나타나 전체적으로는 두 곡선이 연결된 형태의 분포를 나타내었다. 흉고직경 13cm이하에서는 수목들의 경쟁이 심하였으나 그 이상에서는 완화되는 것으로 나타났다. 최우점종인 상수리나무의 흉고직경계 분포는 종 모양의 분포를 보였고, 시간이 지남에 따라 흉고직경이 큰 쪽으로 분포가 이동하지만 개체수는 줄어들었고, 신갈나무는 낮은 종 모양의 분포가 점점 높아지는 변화를 보였다. 흉고직경계분포의 변화로 볼 때, 단석산의 상수리나무 식분은 이차천이의 초기 단계에서 중간 단계로 삼림천이가 진행 중인 것으로 판단이 되며, 현재 본 식분의 최우점종은 상수리나무이고 준우점종은 신갈나무이지만, 향후 신갈나무가 최우점종인 식분으로의 천이가 진행될 것으로 예상된다.

Keywords

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