Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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A Study on the Variation of River Vegetation by Seasonal Precipitation Patterns

계절별 강수 패턴에 따른 하천 식생 변화 양상 연구

  • Hee-Jeong JEONG (Dept. of Urban Planning and Landscape, Dong-a University) ;
  • Seung-Yeon YU (Dept. of Urban Planning and Landscape, Dong-a University) ;
  • Eun-Ji CHO (Dept. of Urban Planning and Landscape, Dong-a University) ;
  • Yong-Joo JI (Dept. of Urban Planning and Landscape, Dong-a University) ;
  • Yong-Suk KIM (Dept. of Urban Planning and Landscape, Dong-a University) ;
  • Hyun-Kyung OH (Climate Change and Environmental Biology Research Division, National Institute of Biological Resources) ;
  • Jong-Sung LEE (Climate Change and Environmental Biology Research Division, National Institute of Biological Resources) ;
  • Hyun-Do JANG (Gardens and Education Research Division, Korea National Arboretum) ;
  • Dong-Gil CHO (Dept. of Urban Planning and Landscape, Dong-a University)
  • 정희정 (동아대학교 도시계획.조경학과) ;
  • 유승연 (동아대학교 도시계획.조경학과) ;
  • 조은지 (동아대학교 도시계획.조경학과) ;
  • 지용주 (동아대학교 도시계획.조경학과) ;
  • 김용석 (동아대학교 디자인환경대학 조경학과) ;
  • 오현경 (국립생물자원관 기후환경생물연구과) ;
  • 이종성 (국립생물자원관 기후환경생물연구과) ;
  • 장현도 (국립수목원 전시교육연구과) ;
  • 조동길 (동아대학교 디자인환경대학 조경학과)
  • Received : 2023.02.09
  • Accepted : 2023.04.03
  • Published : 2023.06.30
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Abstract

In Korea, excessive vegetation in rivers made up of sand and gravel is emerging as a nationwide problem, which is attributed to increased spring precipitation and decreased annual precipitation. Therefore, this study was conducted for the purpose of identifying the effect of changes in precipitation patterns on river vegetation in Namcheon, Gyeongju, and analyzing the area of vegetation and ecological characteristics. As a result of the study, the amount of monthly precipitation in the summer of Namcheon decreased after 2007, and the area of vegetation increased continuously compared to the area of the sandbank. The proportion of naturalized plants increased steadily when precipitation continued to a level that did not cause flooding, but the area occupied by naturalized plants was small. Also, when the water level is maintained, the species diversity is low due to the dominance of a single species, and the dominant species was mainly native plants. Dominance of native plants inhibited the growth of naturalized plants, but the vegetation area increased even more. Therefore, it is necessary to manage the spread of vegetation itself rather than the division of native plants and naturalized plants in order to eliminate the active growth and prosperity of river vegetation. High water levels and continuous flooding caused by torrential rains in summer disturbed the plant communities, and vegetation formed afterwards was mainly native plants. Such flooding in river ecosystems is a positive factor for the emergence of native plants and over-formed vegetation communities, so it should be considered when establishing a vegetation management plan.

국내에서는 모래와 자갈로 구성된 하천에서 식생이 과도하게 번성하는 현상이 전국적인 문제로 대두되고 있으며, 그 요인을 봄철 강수량 감소와 연강수량 증가로 지적하고 있다. 본 연구는 경주시 소재 남천을 대상으로 강수 패턴 변화가 하천 식생에 미치는 영향을 파악하고 출현 식생의 면적변화, 그리고 생태적 특성 분석을 목적으로 수행되었다. 연구 결과, 남천의 여름철 월강수량은 2007년 이후로 감소하는 양상을 보였으며 사주면적 대비 식생면적은 지속적으로 증가하였다. 범람이 발생하지 않는 수준의 강수가 지속될 때 귀화식물 비율은 꾸준히 증가했으나, 귀화식물이 차지하는 면적은 적었다. 또한 일정 수위가 유지될 때, 단일종의 우점으로 인해 종다양성이 낮았으며 우점하는 종은 주로 자생식물이었다. 자생식물의 우점은 귀화식물의 생육을 억제하였으나, 식생면적은 더 크게 증가하였다. 따라서 하천식생의 활착과 번성을 해소하기 위해서는 자생식물과 귀화식물의 구분보다 식생확산 자체에 대한 관리가 필요하다. 여름철 집중 호우로 인한 고수위와 범람 지속은 식물군락을 교란시켰고 이후 형성된 식생은 주로 자생식물이었다. 하천생태계에서 이와 같은 범람은 자생식물의 출현과 과도하게 형성된 식생군락에 긍정적인 요소로 작용하므로 식생 관리 계획 수립 시 고려해야 할 것이다.

Keywords

Acknowledgement

본 연구는 기후변화 대응 생물다양성 평가 및 변화 예측 연구의 지원으로 수행되었음(과제번호: NIBR202205101)

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