The objective of this study was to analyze long-term annual and seasonal trends of water chemistry on landuse patterns and seasonal precipitation using 72 sampling sites within Namhan River watershed during 2001-2010. Water quality, based on multi-parameters of water temperature(WT), dissolved oxygen(DO), biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids(SS), total nitrogen(TN), total phosphorus(TP), and electric conductivity(EC) varied largely depending on monsoon rain and landuse patterns such as forest, cropland, and residence. Concentrations of BOD and COD as an indicator for organic matter pollution, increased during summer monsoon season at the cropland and residential streams. Values of TN and TP were higher in residential streams than in the forest and cropland streams. In the meantime, DO values had weak relations to the landuse patterns of forest and cropland cover. Water quality was worst in cropland and residential streams, and also most degradated in 4th order streams. Overall, our results suggest that efficient water quality management is required in the cropland and residential landuse streams.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 대상유역과 수질자료
  2.2. 강우자료
  2.3. 토지이용도(Landuse pattern) 분석
 3. 결과 및 고찰
  3.1. 하천 유역별 토지이용도 분포특성
  3.2. 토지 이용도 및 강우 특성에 따른 계절별 수질특성
  3.3. 연별 수질특성
  3.4. 토지 이용도별 수질특성
  3.5. 하천차수별 수질변화 특성
 4. 결 론
 참 고 문 헌

• 이지은(충남대학교 생명시스템과학대학 생물과학과) | Ji-Eun Lee (Department of Biological Sciences, Chungnam National University)
• 최지웅(충남대학교 생명시스템과학대학 생물과학과) | Ji-Woong Choi (Department of Biological Sciences, Chungnam National University)
• 안광국(충남대학교 생명시스템과학대학 생물과학과) | Kwang-Guk An (Department of Biological Sciences, Chungnam National University) Corresponding author