This study was performed to investigate the physico-chemical properties and phytoplankton concentration from February to December, 2007 in Gwangju area reservoirs. Water samples from 20 reservoirs were analyzed. As results of the water quality analysis, the average pH was 7.6 and annual pH were 6.3 ～9.6. The higher pH of 8.6 ～ 9.6 were showed from March to August due to eutrophication. Chlorophyll-a concentration ranged from 0.4 to 164.3 mg/㎥. The highest chlorophyll-a concentration was observed in August. BOD was correlated with SS, T-N, and Chlorophyll-a(R=0.82, 0.90 and 0.84) respectively. COD was correlated with BOD, SS and Chlorophyll-a(R= 0.89, 0.77 and 0.76) respectively. The T-N/T-P ratios were 4～281, so phosphorus was considered to be the limiting factor in most of points. The trophic state showed eutrophicate states in Gwangju reservoirs. Therefore it was necessary to monitor continuously. In order to monitor the reservoirs, an algae prediction system must be used.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 조사대상 및 기간
  2.2. 조사방법
 3. 결과 및 고찰
  3.1. 기상특성
  3.2. Water temperature(수온)
  3.3. pH(수소이온농도)
  3.4. COD, BOD, DO, SS(화학적산소요구량, 생물학적산소요구량, 용존산소, 부유물질)
  3.5. T-N, T-P, Chlorophyll-a(총질소, 총인, 클로로필-a)
  3.6. phytoplankton(플랑크톤)
  3.7. 상관성 비교
 4. 결 론
 참 고 문 헌

• 김동수(광주광역시보건환경연구원) | Dong-Soo Kim (Gwangju Metropolitan Health & Environment Research Department) Corresponding Author
• 박종환(영산강물환경연구소) | Jong-Whan Park (Yeongsan River Environmental Research Laboratory)
• 김연희(광주광역시보건환경연구원) | Yun-Hee Kim (Gwangju Metropolitan Health & Environment Research Department)
• 송형명(광주광역시보건환경연구원) | Hyung-Myung Song (Gwangju Metropolitan Health & Environment Research Department)
• 박종태(광주광역시보건환경연구원) | Jong-Tae Park (Gwangju Metropolitan Health & Environment Research Department)