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국내 강과 하천에서 이화학적 수질과 생태적 건강성 분석
안광국 ( Kwang-guk An ),( Md. Mamun ),유해찬 ( Haechan Yoo ) 한국환경생태학회 2016 한국환경생태학회 학술대회지 Vol.2016 No.2
The objectives of this study were twofold: to analyze seasonal variation in nutrients and sestonic chlorophyll (CHL-a) in Asian lotic ecosystems, and to evaluate multi- trophic level ecological stream health (ESH) in relation to stream morphology, land-use patterns, and water chemistry. We conducted physical, chemical, and biological surveys at 72 national streams and rivers, and at 65 reference streams. Water chemistry data indicated that ambient nutrient (N, P) levels were closely associated with land-use patterns and stream elevation, and that these, in turn, influenced both community structures of fish and stream health in general. In the watershed, total phosphorus (TP) was a key determinant of sestonic CHL-a, and the mass ratio TN:TP was determined by phosphorus (R<sup>2</sup> = 0.63, p < 0.01) rather than nitrogen (R<sup>2</sup> = 0.01, p > 0.05). Proportions of tolerant and omnivorous fish increased with nutrient enrichment and organic matter pollution, while proportions of sensitive and insectivorous fish decreased. Lotic ecosystem health, based on a multi-metric approach (MF-IBI model), was clearly demonstrated by a multivariate analysis (PCA); important factors were watershed characteristics (land-use patterns), nutrient levels (N, P), organic matter (BOD, COD) regimes, and biological components (trophic and tolerance guilds).
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