The seasonal variation of phytoplankton communities and its standing crops in accordance with environmental factors were investigated at Yeongrang-ho, Cheongcho-ho, Mae-ho and Hyang-ho which are located in the East coast of Korea during April to October 2011. High concentrations of T-N and T-P were observed in four lagoons due to the inflowing nutrients from farmlands and residential areas near lagoons. Nutrient salts mainly composed of nitrogen and phosphate caused the eutrophication of the lakes, leading to the robust growth of phytoplankton. During the period of investigation, 64 to 107 taxa of phytoplankton were observed in four lagoons. Diatoms were the most dominant species with high density. Non-point pollution source was estimated as the main cause of water pollution of lagoons. Trophic states of lagoons evaluated using the value of TSI and TSIKO indicated that all the investigated lagoons were in the eutrophication state.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 조사 지점 선택 및 현황
  2.3. 조사 방법
 3. 결 과
  3.1. 석호의 환경 요인
  3.2. 식물플랑크톤 조사 결과
  3.3. 석호의 부영양화도 평가
 4. 고 찰
 5. 결 론
 REFERENCE

• 문병렬((주)코비 KORBI 환경연구소) | Byeong Ryeol Moon (KORBI Research Institute, KORBI Co., Ltd.)
• 전현진((주)코비 KORBI 환경연구소)
• 전숙례((주)코비 KORBI 환경연구소) | Sook Lye Jeon (KORBI Research Institute, KORBI Co., Ltd.)
• 이재선((주)코비 KORBI 환경연구소) | Jae Sun Lee (KORBI Research Institute, KORBI Co., Ltd.)
• 신지은((주)코비 KORBI 환경연구소) | Ji Eun Shin (KORBI Research Institute, KORBI Co., Ltd.)
• 안지혜((주)코비 KORBI 환경연구소) | Ji Hye Ahn (KORBI Research Institute, KORBI Co., Ltd.)
• 양용운(계명문화대학교 소방환경안전과) | Yong Woon Yang (Department of Fire & Environmental Safety, Keimyung College University)
• 현문식((주)코비 KORBI 환경연구소) | Moon Sik Hyun (KORBI Research Institute, KORBI Co., Ltd.)
• 김미아((주)코비 KORBI 환경연구소) | Mia Kim (KORBI Research Institute, KORBI Co., Ltd.) Corresponding author