Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Determination of the Origin of Particulate Organic Matter at the Estuary of Youngsan River using Stable Isotope Ratios (${\delta}^{13}C$, ${\delta}^{15}N$)

탄소 및 질소 안정동위원소 비를 이용한 영산강하구역 유기물 기원 추정 연구

  • Lee, Yeon-Jung (Department of Marine Sciences and Convergence Technology, Hanyang University) ;
  • Jeong, Byung-Kwan (Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University) ;
  • Shin, Yong-Sik (Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University) ;
  • Kim, Sung-Hwan (Department of Chemistry, Kyungpook National University) ;
  • Shin, Kyung-Hoon (Department of Marine Sciences and Convergence Technology, Hanyang University)
  • 이연정 (한양대학교 해양융합과학과) ;
  • 정병관 (목포해양대학교 환경.생명공학과) ;
  • 신용식 (목포해양대학교 환경.생명공학과) ;
  • 김성환 (경북대학교 화학과) ;
  • 신경훈 (한양대학교 해양융합과학과)
  • Received : 2013.01.28
  • Accepted : 2013.04.15
  • Published : 2013.06.30
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Abstract

Organic carbon and total nitrogen stable isotope ratios of suspended materials were determined at 3 stations (from Mongtan Bridge to Youngsan river estuary barrage) (n=6, each) from November 2008 to August 2009, in order to understand the origin of particulate organic matter at the Estuary of Youngsan River. Allochthonous organic matter, ammonia-N and silicate were increased after heavy rain (in August). Carbon isotope ratios were significantly different between stations in November and August, and it was possible to determine the origin of organic matter. The heavier nitrogen isotope ratios, as well as higher phosphate concentrations, were found in November than other sampling times. Livestock wastewater and farmland input was likely the main causes of these high values. In addition, YS3 station, the nearest site to estuary barrage, appears to be affected by a substantial amount of livestock wastewater and farmland input, considering that nitrogen isotope ratios were heavier than those at the upper sites. These results suggest that the analysis of stable isotope ratios is a simple but useful tool for the determination of organic matter origin in aquatic environments.

본 연구는 영산강하구역 입자물질 유입원의 시 공간적인 변화를 추정해 보고자 몽탄대교에서 영산강 하구둑에 이르는 영산강하구역 세 정점에서 연 6회에 걸쳐 수 층 부유 물질의 탄소 및 질소 안정동위원소 비를 비교하였다. 모든 정점에서 8월에 강우를 통한 외부기원 유기물의 유입이 증가하였으며, 이 때 암모니아성 질소 및 규산염의 유입 역시 함께 증가하였다. 탄소 안정동위원소 비 측정 결과 11월과 8월에 정점 별 유기물의 기원이 크게 차이 났으며, 안정동위원소 비 값을 이용하여 주요 유입원 추정이 가능하였다. 11월에 모든 정점에서 질소 안정동위원소 비가 무거운 값을 보였고, 인산염의 농도가 가장 높게 나타났는데 이는 축산폐수 및 농경지를 통한 유입이 영향을 준 것으로 판단된다. 또한 다른 정점에 비해 영산강 하구둑에서 모든 조사 기간 동안 비교적 높은 질소 안정동위원소 비를 보였으며, 이를 통해 축산폐수 및 농경지를 통한 유기물 유입이 다른 정점에 비해 높을 것으로 추정된다. 본 연구 결과를 통해 안정동위원소 비 분석은 입자성유기물의 기원을 추정하는데 유용한 방법임을 확인할 수 있었다.

Keywords

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