Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Current Status of Alien Plants in the Reservoir Shoreline in Korea

우리나라 저수지 호안에서 외래식물의 현황

  • Received : 2015.11.30
  • Accepted : 2015.12.20
  • Published : 2015.12.30
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Abstract

The reservoir shores seem to be vulnerable to biological invasion. The purpose of this research was to find out the floristic composition of alien plants and their relationship between environmental factors on reservoir shorelines in Korea. We investigated flora of alien plants and environmental factors of geomorphology, hydrology, water quality and soil on the shoreline of a total of 35 reservoirs with different water level managements. There were 56 species of alien plants, which was 15% of the total plant species identified in the study of reservoirs. A total of 57% of these alien species were the species which were introduced shortly after opening the port from 1876 to 1921 in Korea. More than 80% of the alien plants on the reservoir shores originated from America and Europe. The current distribution of Ambrosia trifida and Paspalum distichum were restricted in the central part and the southern region of the Korean Peninsula, respectively. The water level fluctuation, flood frequency at the median water level, water pollution index, coverage of rock exposure and mean degree of shoreline slope were determined as important environmental factors that have an effect on the characteristics of shoreline alien flora. Our results suggest that the reservoir shore was in danger of being invaded by alien plants due to the water level management and other human disturbances. For effective conservation of the reservoir ecosystem, periodic monitoring systems are required for the early detection of alien species on the reservoir shore.

저수지 호안은 생물 침입에 취약하다고 생각된다. 본 연구의 목적은 우리나라 저수지 호안에서 침입식물의 종조성의 현황과 외래식물상과 환경요인 사이의 관계를 파악하는 것이다. 다양한 수위 관리를 하고 있는 35 개 저수지 호안에서 외래식물 식물상과 지형, 수문, 수질 및 토양 환경 요인을 조사하였다. 조사 대상 저수지 호안에서 외래식물은 56 종이 발견되어 출현식물 총종수의 15%를 차지하였다. 이들 외래식물을 도입시기별로 분류하면 1876 - 1921 년인 개항 직후에 도입된 것이 57%로서 많았다. 또한 이들의 원산지는 아메리카와 유럽이 80% 이상으로 많았다. 특이한 분포를 나타내는 외래종은 단풍잎돼지풀 (Ambrosia trifida)이 중부 지역에, 물참새피 (Paspalum distichum)가 남부 지역에 제한적으로 분포하였다. 저수지 호안에서 외래식물 식물상에 영향을 미치는 주요한 환경 요인은 연간 수위변동폭, 중앙수위 범람빈도, 수질오염 지수, 암석노출도 및 평균 사면 경사도이었다. 결론적으로 수위 관리와 기타 인간 교란이 가해지는 저수지 호안은 외래식물의 침입에 취약하였다. 저수지 호안의 효과적인 보전을 위하여 외래식물의 초기 도입을 탐지할 수 있는 주기적 모니터링 체계가 필요할 것으로 생각된다.

Keywords

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