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Changes for Stand Structure of Abies koreana Forest at the Yeongsil Area of Mt. Hallasan for Six Years (from 2011 to 2017)

한라산 영실 지역 구상나무림의 6년간(2011년과 2017년)의 임분구조 변화

  • Song, Ju Hyeon (Department of Forest Resource, Kongju National University) ;
  • Han, Sang Hak (Division of Ecological Basic Research, National Institute of Ecology) ;
  • Han, Sang Hak (Division of Ecological Basic Research, National Institute of Ecology) ;
  • Yun, Chung Weon (Department of Forest Resource, Kongju National University)
  • 송주현 (공주대학교 산림자원학과) ;
  • 한상학 (국립생태원 생태기반연구실) ;
  • 이상훈 (국립생태원 생태기반연구실) ;
  • 윤충원 (공주대학교 산림자원학과)
  • Received : 2018.10.05
  • Accepted : 2019.02.15
  • Published : 2019.03.31

Abstract

This study was carried out to compare stand structure and dynamics in Abies koreana forest in Yeongsil area of Mt. Hallasan between 2011 and 2017 by analysing DBH distribution, tree vitality, importance value (IV) and species diversity through the national long-term ecological research project conducted by National Institute of Environmental Research. As a result of DBH distribution, A. koreana decreased in all DBH class except 20-25 cm and the number of individual decreased by 16.3 percent from 780 to 655. As a result of tree vitality of A. koreana, the number of standing alive (AS) decreased by 16.2 percent from 652 to 546, while that of standing dead (DS) increased by 15.8 percent from 106 to 126 and that of fallen dead (DF) increased by 193.7 percent from 16 to 47, respectively. Importance value of A. koreana decreased by 2.4 percent point from 45.9 % to 43.5 %. Species diversity increased by 0.006 from 0.513 to 0.519. The weakening of the A. koreana in the Yeongsil area of Mt. Hallasan could be considerably supported by many aspects such as DBH distribution, tree vitality and importance value. Therefore, Long-term ecological monitoring and continuously research in that area should be conducted to clarify the effects of ecosystem changes.

본 연구는 국립환경과학원에서 실시한 국가 장기 생태 연구를 위해 구축된 한라산 영실 구상나무림 1 ha ($100m{\times}100m$)를 대상으로 흉고직경급 분포, 수간건강상태, 중요치, 종다양도 분석을 통해 6년간(2011~2017)의 임분 구조 및 동태를 비교하기 위하여 실시하였다. 흉고직경급 분포에서 구상나무는 20-25 cm 직경급을 제외하고 모든 직경급에서 개체수의 감소가 나타났으며, 총 개체수의 변화도 780개체에서 655개체로 감소하였다. 수간건강상태에서 구상나무의 곧게 서서 생육하는 개체(AS)의 비율이 652개체(66.1 %)에서 546개체(60.2 %)로 감소한 반면에 곧게 서서 고사한 개체(DS)의 비율은 106개체(10.7 %)에서 126개체(13.9 %)로, 쓰러져 고사한 개체(DF)의 비율은 16개체(1.6 %)에서 47개체(5.2 %)로 각각 증가하였다. 구상나무의 중요치는 2011년 45.9 %에서 2017년 43.5 %로 감소한 것으로 나타났다. 종다양도의 경우, 2011년 0.513에서 2017년 0.519로 증가한 것으로 나타났다. 2011년에서 2017년까지 6년간의 변화를 살펴보았을 때, 한라산 영실지역에서 구상나무의 세력 약화는 흉고직경급 분포, 수간건강상태, 중요치 등 많은 측면에서 뒷받침 되고 있으며, 앞으로 생태계 변화에 의한 영향을 구명하기 위한 장기적인 모니터링 및 연구가 필요할 것으로 사료되었다.

Keywords

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Figure 1. The location of the study site in Mt. Hallasan.

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Figure 2. Changes of the distribution of DBH classes for major 4 species and the other species in study site.

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Figure 3. Changes of tree vitality of Abies koreana and the other species.

Table 1. Comparing importance value between 2011 year and 2017 year in study site.

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Table 2. Comparing species diversity indices between 2011 year and 2017 year.

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