Total organic carbon(TOC), Total nitrogen(TN), and carbon and nitrogen stable isotopes were measured in the sediment and suspended parties in fresh lake water and saline estuarine water to determine the sources of Particulate organic matter(POM) in the sediments of the Youngsan river estuary.
POM in the freshwater discharge water was mostly phytoplankton origin with little trace of terrestrial plants. POM from phytoplankton blooms formed in estuarine water in response to the nutrient enriched freshwater discharges was the most important sources of POM in the sediment near the dike, comprising more than 40% of the total organic matter.
POM from freshwater phytoplankton and oceanic phytoplankton were also important sources of the sediment POM, and their contributions varied with the distances from the dike. Contribution of freshwater phytoplankton to sediment POM decreased from the dike to the outside of the estuary.

Abstract
 1. 서 론
 2. 재료 및 방법
 3. 결과 및 고찰
  3.1 TOC와 TN 분포
  3.2 C/N 비를 이용한 퇴적물 내 유기물의 기원 추정
  3.3 탄소 동위원소(δ13C)와 질소 동위원소(δ15N)의 분포
  3.4 안정 동위원소를 이용한 퇴적물 내 유기물 기원 추정
 4. 결 론
 감사의 글
 참고문헌

• 우준식((주)지오시스템리서치) | Jun-Sik Woo (Geosystem Research Corporation) Corresponding author
• 최희선((주)지오시스템리서치) | Heeseon Choi (Geosystem Research Corporation)
• 이효진((주)지오시스템리서치) | Hyo-Jin Lee (Geosystem Research Corporation)
• 김태하((주)지오시스템리서치) | Tae-Ha Kim (Geosystem Research Corporation)