Journal of the Korean Society of Environmental Restoration Technology (한국환경복원기술학회지)

The Korea Society of Environmental Restoration Technology (한국환경복원기술학회)
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Study of the Non-linear Relationships between Watershed Land Use and Biological Indicators of Streams - The Han River Basin -

유역 토지이용과 하천 생물지수의 비선형적 관계 연구 - 한강권역을 대상으로 -

  • Park, Se-Rin (Department of Forestry and Landscape Architecture, Konkuk University) ;
  • Lee, Jong-Won (Department of Forestry and Landscape Architecture, Konkuk University) ;
  • Park, Yu-Jin (Department of Forestry and Landscape Architecture, Konkuk University) ;
  • Lee, Sang-Woo (Department of Forestry and Landscape Architecture, Konkuk University)
  • 박세린 (건국대학교 산림조경학과) ;
  • 이종원 (건국대학교 산림조경학과 대학원) ;
  • 박유진 (건국대학교 산림조경학과 대학원) ;
  • 이상우 (건국대학교 산림조경학과)
  • Received : 2022.04.15
  • Accepted : 2022.04.26
  • Published : 2022.04.29
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Abstract

Land use is a critical factor that affects the hydrological characteristics of watersheds, thereby determining the biological condition of streams. This study analyzes the effects of land uses in the watersheds on biological indicators of streams across the Han River basin using a linear model (LM) and generalized additive model (GAM). LULC and biological monitoring data of streams were obtained from the Korean Ministry of Environment. The proportions of urban, agricultural, and forest areas in the watersheds were regressed to the three biological indicators, including diatom, benthic macroinvertebrate, and fish of streams. The estimated LM and GAM models for the biological indicators were then compared, using regression determination R2 and AIC values. The results revealed that GAM models performed better than the LM models in explaining the variances of biological indicators of streams, indicating the non-linear relationships between biological indicators and land uses in watersheds. Also, the results suggested that the indicator of macroinvertebrates was the most sensitive indicator to land uses in watersheds. Although non-linear relationships between watershed land uses and biological indicators of streams could vary among biological indicators, it was consistent that streams' biological integrity significantly deteriorated by a relatively low percentage of urban areas. Meanwhile, biological indicators of streams were negatively affected by the relatively high percentage of agricultural areas. The results of this study can be integrated into effective quantitative criteria for the watershed management and land use plans to enhance the biological integrity of streams. In specific, land uses management plans in watersheds may need more close attention to urban land use changes than agricultural land uses to sustain the biological integrity of streams.

Keywords

Acknowledgement

이 논문은 2020년도 건국대학교 우수연구인력 양성사업 지원과 환경부의 재원으로 한국환경산업기술원의 ICT 기반 환경영향평가 의사결정 지원 기술개발사업(No. 2020002990009)으로 연구되었으며 환경부와 국립환경과학원의 「하천 수생태계 현황 조사 및 건강성 평가」 자료를 활용했습니다.

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