도심하천 생태계에서의 수질 및 생태건강성 평가 (Water Quality and Ecosystem Health Assessments in Urban Stream Ecosystems)

서지정보

· 발행기관 : 한국환경생물학회
· 수록지 정보 : 환경생물 / 26권 / 4호 / 311 ~ 322페이지
· 저자명 : 김현맥, 이재훈, 안광국

초록

The objectives of the study were to analyze chemical water quality and physical habitat characteristics in the urban streams (Miho and Gap streams) along with evaluations of fish community structures and ecosystem health, throughout fish composition and guild analyses during 2006~2007. Concentrations of BOD and COD averaged 3.5 and 5.7 mg L-1, in the urban streams, while TN and TP averaged 5.1 mg L-1 and 274 μg L-1, indicating an eutrophic state. Especially, organic pollution and eutrophication were most intense in the downstream reach of both streams.
Total number of fish was 34 species in the both streams, and the most abundant species was Zacco platypus (32~42% of the total). In both streams, the relative abundance of sensitive species was low (23%) and tolerant and omnivores were high (45%, 52%), indicating an typical tolerance and trophic guilds of urban streams in Korea. According to multi-metric models of Stream Ecosystem Health Assessments (SEHA), model values were 19 and 24 in Miho Stream and Gap Stream, respectively.
Habitat analysis showed that QHEI (Qulatitative Habitat Evaluation Index) values were 123 and 135 in the two streams, respectively. The minimum values in the SEHA and QHEI were observed in the both downstreams, and this was mainly attributed to chemical pollutions, as shown in the water quality parameters. The model values of SEHA were strongly correlated with conductivity (r=- 0.530, p=0.016), BOD (r=- 0.578, p⁄0.01), COD (r=- 0.603, p⁄0.01), and nutrients (TN, TP: r¤0.40, p⁄0.05). This model applied in this study seems to be a useful tool, which could reflect the chemical water quality in the urban streams. Overall, this study suggests that consistent ecological monitoring is required in the urban streams for the conservations along with ecological restorations in the degradated downstrems.

영어초록

The objectives of the study were to analyze chemical water quality and physical habitat characteristics in the urban streams (Miho and Gap streams) along with evaluations of fish community structures and ecosystem health, throughout fish composition and guild analyses during 2006~2007. Concentrations of BOD and COD averaged 3.5 and 5.7 mg L-1, in the urban streams, while TN and TP averaged 5.1 mg L-1 and 274 μg L-1, indicating an eutrophic state. Especially, organic pollution and eutrophication were most intense in the downstream reach of both streams.
Total number of fish was 34 species in the both streams, and the most abundant species was Zacco platypus (32~42% of the total). In both streams, the relative abundance of sensitive species was low (23%) and tolerant and omnivores were high (45%, 52%), indicating an typical tolerance and trophic guilds of urban streams in Korea. According to multi-metric models of Stream Ecosystem Health Assessments (SEHA), model values were 19 and 24 in Miho Stream and Gap Stream, respectively.
Habitat analysis showed that QHEI (Qulatitative Habitat Evaluation Index) values were 123 and 135 in the two streams, respectively. The minimum values in the SEHA and QHEI were observed in the both downstreams, and this was mainly attributed to chemical pollutions, as shown in the water quality parameters. The model values of SEHA were strongly correlated with conductivity (r=- 0.530, p=0.016), BOD (r=- 0.578, p⁄0.01), COD (r=- 0.603, p⁄0.01), and nutrients (TN, TP: r¤0.40, p⁄0.05). This model applied in this study seems to be a useful tool, which could reflect the chemical water quality in the urban streams. Overall, this study suggests that consistent ecological monitoring is required in the urban streams for the conservations along with ecological restorations in the degradated downstrems.

참고자료

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