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한국 제주도 한란의 생태 진단에 기초한 보전 및 서식지 복원에 관한 연구

Study on Conservation and Habitat Restoration Based on Ecological Diagnosis for Cymbidium kanran Makino in Jeju Island, Korea

  • 투고 : 2015.10.27
  • 심사 : 2015.12.24
  • 발행 : 2016.03.31

초록

한란은 불법 채취 및 서식 환경 변화에 의해 지속성 확보가 위협받고 있음에도 불구하고, 종의 분포 변화, 개체군 및 자생 특성, 그리고 이에 따른 서식지 복원에 관한 연구가 부족하다. 본 연구에서는 2014년 제주도 일원의 한란 자생지 탐사를 통하여 확인된 27개의 한란 자생지를 대상으로 분포 면적의 변화, 개체군 및 자생 환경을 분석하였으며, 한란의 종 특성을 고려한 대체 서식지 조성 전략을 마련하였다. 조사된 한란은 제주도 해발 200 m~700 m 사이에 위치하였다. 2004년과 비교하여 한란의 분포 범위는 크게 감소 (-82%)하였다. 한란은 사면형 (예, 선돌지역) 및 계곡형 (예, 따라비오름) 서식지, 그리고 졸참나무 및 개서어나무가 우점하는 낙엽활엽수림 (선돌) 및 구실잣밤나무가 우점하는 상록활엽수림 모두에서 자라고 있어 특정한 서식 환경 선호성은 관찰되지 않았고, 공중습도가 높은 계곡부에서 보다 많이 관찰되었다. 조사된 총 96개체의 한란의 평균 밀도는 942.6 개체 $ha^{-1}$로 조사되었고, 모두 소형(평균 잎 길이=$10.7{\pm}1.1cm$ 및 촉 수=$1.2{\pm}0.2$) 개체였으며, 개화 및 결실 개체는 관찰되지 않았다. 연구 결과에 의하면, 제주 한란은 멸종위기 (Critically Endangered, CR) 식물로 분류된다. 한란의 표현형 유연성 (Phenotypic plasticity)은 한란이 그늘진 서식지 환경에서 지속할 수 있도록 도움을 준 것으로 판단되며, 최근의 닫힌 임과 및 낮은 광환경은 한란의 생활사에 부정적인 영향을 주고 있었다. 한란 서식지 복원은 초지 또는 낮은 관목수종의 개방된 환경을 조성하는 것이 중요하다.

Cymbidium kanran Makino is being threatened in its own habitats due illegal collecting and habitat changes by vegetation growth along historical landuse change. In this study, we established habitat restoration model for conservation of C. kanran based on ecological diagnosis. Through exploration to Jeju Island in 2014 and 2015, we identified 27 unknown habitats of C. kanran and in there, abiotic variables and vegetation structure and composition were quantified. Altitudinal distribution of C. kanran was between 200 m~700 m a.s.l. and compared to distribution in 2004, Area of Occupation (AOO) decreased at 82%. Specific habitat affinity was not observed by evenly found in mountain slope and valley and summergreen and evergreen broadleaved forests, but likely more abundant in valley habitats with higher soil and ambient moisture. Total of 96 individual of C. kanran was observed with an average density of $942.6individuals\;ha^{-1}$. The plants showed relatively short leaf length (average=$10.7cm{\pm}1.1cm$) and small number of pseudo bulbs ($1.2{\pm}0.2$). Flowering and fruiting individuals were not observed in field. C. kanran was classified into endangered plant species as CR (Critically Endangered) category by IUCN criteria. Phenotypic plasticity of C. kanran was likely support to sustain in more shaded habitat environment and recent habatat changes to closed canopy and low light availability may exhibit negatively effects to C. kanran's life history. Restoring C. kanran habitat should create open environment as grassland and low woody species density.

키워드

참고문헌

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