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2022 Vol.9, Issue 2

Original Article

Spatial Point Pattern Analysis of Riparian Tree Distribution After the 2020 Summer Extreme Flood in the Seomjin River

2020년 여름 섬진강 대홍수 이후 하천 수목 분포에 대한 공간 점 패턴 분석

Keonhak Lee1
,
Eunsuk Cho2
,
Jonghun Cho2
,
Cheolho Lee3
,
Hwirae Kim4
,
Donghae Baek5
,
Won Kim6
,
Kang-Hyun Cho7
,
Daehyun Kim8*
이 건학1
,
조 은숙2
,
조 종훈2
,
이 철호3
,
김 휘래4
,
백 동해5
,
김 원6
,
조 강현7
,
김 대현8*
1Researcher, The Institute for Korean Regional Studies, Seoul National University, Seoul 08826, Korea
2Master’s Student, Department of Planning and Landscape Architecture, Dong-A University, Busan 49315, Korea
3Doctoral Student, Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Korea
4Staff, Department of Environmental Engineering, Soosungengineering, Seoul 05837, Korea
5Senior Researcher, Korea Rural Community Corporation, Rural Research Institute, Naju 58327, Korea
6Senior Research Fellow, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
7Professor, Department of Biological Sciences, Inha University, Incheon 22212, Korea
8Professor, Department of Geography, Seoul National University, Seoul 08826, Korea
1서울대학교 국토문제연구소 연구원
2동아대학교 도시계획·조경학과 석사과정
3인하대학교 바이오시스템융합학과 박사과정
4(주)수성엔지니어링 환경사업부 사원
5한국농어촌공사 농어촌연구원 선임연구원
6한국건설기술연구원 수자원하천연구본부 선임연구위원
7인하대학교 생명과학과 교수
8서울대학교 지리학과 교수
*Corresponding Author
30 June 2022. pp. 83-92
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Abstract

The 2020 summer extreme flood severely disturbed the riparian ecosystem of the Seomjin River. Some trees were killed by the flood impact, whereas others have recovered through epicormic regeneration after the disturbance. At the same time, several tree individuals newly germinated. This research aimed to explain the recovery of the riparian ecosystem by spatial proximity between each tree individual of different characteristics, such as “dead”, “recovered”, and “newly germinated”. A spatial point pattern analysis based on K and g-functions revealed that the newly germinated trees and the existing trees were distributed in the spatially clumping patterns. However, further detailed analysis revealed that the new trees were statistically less attracted to the recovered trees than the dead trees, implying competitive interactions hidden in the facilitative interactions. Habitat amelioration by the existing trees positively affected the growth of the new trees, while “living” existing trees were competing with the new trees for resources. This research is expected to provide new knowledge in this era of rapid climate change, which likely induces stronger and more frequent natural disturbance than before. Environmental factors have been widely used for ecosystem modeling, but species interactions, represented by the relative spatial distribution of plant individuals, are also valuable factors explaining ecosystem dynamics.

Keywords
Climate change
Disturbance
Recovery
Second-order effect
Spatial interaction

2020년 여름, 한반도 남부를 강타한 대홍수는 섬진강 하천 생태계를 크게 교란시켰다. 홍수의 피해를 입은 하천 수목 중 일부는 고사하였고, 또 다른 일부는 시간이 지남에 따라 어느 정도 회복되는 모습을 보였다. 더불어 홍수 후 새로 자라난 수목도 관찰되었다. 본 연구에서는 교란된 하천 생태계가 회복하는 과정을 서로 다른 특성의 수목 간 공간적 인접성을 통해 설명하였다. 공간 점 패턴 분석 (spatial point pattern analysis) 결과, 새로 발생한 수목과 홍수 이전부터 존재하였던 수목은 서로 공간적으로 군집하는 것으로 나타났다. 하지만 보다 세밀한 분석을 통해 새로 발생한 수목은 기존 수목 중 회복한 수목보다 회복되지 않은 수목과 더 강하게 군집한다는 사실이 밝혀졌으며, 이를 통해 촉진적 (facilitative) 상호작용 속에 가려진 경쟁적 (competitive) 상호작용을 포착할 수 있었다. 기존 수목에 의한 서식처 개선 효과는 새로 발생한 수목의 생장에 긍정적인 역할을 했을 것이나, “살아 있는” 기존 수목은 새로 발생한 수목과 한정된 자원을 두고 경쟁했을 것으로 예상된다. 이러한 결과는 전 지구적인 기후변화의 맥락 속에서 국내 하천 생태계가 마주할 강하고 빈번한 자연적 교란에 대비할 새로운 지식을 제공할 수 있다. 전통적으로 학계에서는 환경 요인을 설명 변수로 하는 생태 모델링이 널리 사용되고 있지만, 수목 개체들 간 상대적 위치 관계로 대표될 수 있는 개체 간 상호작용 역시 생태계 변화를 설명하는 데 있어서 중요한 요인이라고 할 수 있다.

키워드
교란
기후변화
공간적 상호작용
이차 효과
회복
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 9
  • No :2
  • Pages :83-92
  • Received Date : 2022-03-16
  • Revised Date : 2022-04-28
  • Accepted Date : 2022-04-28
  • DOI :https://doi.org/10.17820/eri.2022.9.2.083
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