[논문]유역 토지이용과 하천 생물지수의 비선형적 관계 연구 - 한강권역을 대상으로 -

박세린; 이종원; 박유진; 이상우

doi:10.13087/kosert.2022.25.2.55

유역 토지이용과 하천 생물지수의 비선형적 관계 연구 - 한강권역을 대상으로 -
Study of the Non-linear Relationships between Watershed Land Use and Biological Indicators of Streams - The Han River Basin - 원문보기

環境復元綠化 = Journal of the Korean Society of Environmental Restoration Technology, v.25 no.2, 2022년, pp.55 - 67

박세린 (건국대학교 산림조경학과) , 이종원 (건국대학교 산림조경학과 대학원) , 박유진 (건국대학교 산림조경학과 대학원) , 이상우 (건국대학교 산림조경학과)

Abstract ▼ AI-Helper

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.

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표/그림 (7)

그림 Figure 1. Study area and sampling sites of National Aquatic Ecological Monitoring Program
그림 Figure 2. Boxplots of variables including LULC, and biological indicators
그림 Figure 3. Estimated smooth function and 95% confidence interval (CI, shaded areas) of watershed land use on TDI: (a) urban area, (b) agricultural area, (c) forest area.
표 Table 1. Estimated LM and GAM models for TDI, BMI and FAI.
그림 Figure 4. Estimated smooth function and 95% confidence interval (CI, shaded areas) of watershed land use on BMI: (a) urban area, (b) agricultural area, (c) forest area.
그림 Figure 5. Estimated smooth function and 95% confidence interval (CI, shaded areas) of watershed land use on FAI: (a) urban area, (b) agricultural area, (c) forest area.
표 Table 2. Performance indicators of LM and GAM models. The higher value of R2 and lower values of AIC indicate better performance of the estimated models.

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