A ecosystem model was applied for understanding of circulation process of state variables in marine ecosystem. A mass balance was conducted by calculating the physical process. The sensitivity analysis was conducted to know which coefficient is the most effective factor to the state variables in the model. The results of the mass balance indicate that the primary production was 58.6 ton C/day in the case of mass flux. DIN and DIP in nutrient ingestion of phytoplankton were each 7.9 ton N/day, 1.1 ton P/day. POC and DOC in mineralization of organic matter were each 10.8 ton C/day, 40.6 ton C/day. The results of sensitivity analysis showed that the maximum growth rate of phytoplankton was the most important factor for overall state variables. In the case of nutrients, Half saturation constant of DIN, and mineralization rate of DOM for COD were important factor.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 생태계 모델
 3. 결과 및 고찰
  3.1. 대상지역
  3.2. 상태변수의 분포계산
  3.3. 상태변수의 물질수지
  3.4. 민감도 분석
  3.5. 물리 과정량
 4. 결 론
 참 고 문 헌

• 김동명(부경대학교 생태공학과) | Dong-Myung Kim (Department of Ecological Engineering, Pukyong National University) Corresponding Author