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Determination of the Origin in both Dissolved Inorganic Nitrogen and Phytoplankton at the Lake Paldang using Stable Isotope Ratios (δ13C, δ15N, δ15N-NO3 and δ15N-NH4)

질산염 및 식물플랑크톤의 안정동위원소비를 이용한 팔당호 수계내의 질소원 기원 연구

  • Kim, Min-Seob (Environmental Measurement & Analysis Center, NIER) ;
  • Lee, Eun-Jeong (Han-River Environment Research Center, NIER) ;
  • Yoon, Suk-Hee (Environmental Measurement & Analysis Center, NIER) ;
  • Lim, Bo-La (Environmental Measurement & Analysis Center, NIER) ;
  • Park, Jaeseon (Environmental Measurement & Analysis Center, NIER) ;
  • Park, Hyunwoo (Environmental Measurement & Analysis Center, NIER) ;
  • Chung, Hyen-Mi (Fundamental Environment Research Department, NIER) ;
  • Choi, Jong-Woo (Environmental Measurement & Analysis Center, NIER)
  • 김민섭 (국립환경과학원 환경측정분석센터) ;
  • 이은정 (국립환경과학원 한강물환경연구소) ;
  • 윤숙희 (국립환경과학원 환경측정분석센터) ;
  • 임보라 (국립환경과학원 환경측정분석센터) ;
  • 박재선 (국립환경과학원 환경측정분석센터) ;
  • 박현우 (국립환경과학원 환경측정분석센터) ;
  • 정현미 (국립환경과학원 환경기반연구부) ;
  • 최종우 (국립환경과학원 환경측정분석센터)
  • Received : 2017.12.12
  • Accepted : 2017.12.31
  • Published : 2017.12.31

Abstract

The nitrogen isotope value in both ammonium and nitrate ion were determined at 9 stations during both June and August 2016, in order to understand the origin of DIN at the Han river. ${\delta}^{15}N-NO_3$ and ${\delta}^{15}N-NH_4$ values in 8 stations (CP, SB, MHC, P4, SJ, SBC, P2, SC) were no significant variation. However ${\delta}^{15}N-NO_3$ and ${\delta}^{15}N-NH_4$ values in KK (Kyeongan stream) showed significant different in comparison with 8 stations, with an apparent increase of nitrogen isotope values. These results indicate that antropogenic nitrogen source influence on KK station. Also the ${\delta}^{13}C$ and ${\delta}^{15}N$ isotope ratio of phytoplankton (Diatom and Cyanobacteria) in KK (Kyeongan stream) showed heavier values, compared to other study stations. These results indicate that nitrogen isotope value in phytoplankton effects by different nitrogen source in study sites. These results suggest that the analysis of stable isotope ratios is a simple but useful tool for the identification of dissolved inorganic nitrogen origin in aquatic environments.

본 연구는 암모니아성 질소 및 질산성 질소의 안정동위원소 분석방법을 적용하여, 호소 내 식물플랑크톤 성장에 영향을 미치는 외부 오염원의 기원을 추정함으로써, 효율적인 수질 관리 및 수생태계 기능해석 지원기능을 제공하기 위하여 연구하였다. 남한강, 북한강, 팔당호 지역에 비해서 경안천 지역의 유기물 기원이 뚜렷하게 차이를 보이며, 외부기원 유기물이 높은 영향을 미치는 것으로 여겨진다. 또한 식물플랑크톤(규조류, 남조류)이 자생기원 보다는 외부기원 질소원을 활용하고 있음을 확인하였다. 한강 유역에서 암모니아성 질소 및 질산성 질소의 안정동위원소비를 이용한 유기물 기원 연구는 적용가능 할 것으로 여겨지며, 식물플랑크톤의 탄소 및 질소 동위원소비를 활용하여 그 거동을 추정할 수 있었다. 추후 유역 오염원의 대표 값(end member)의 지속적인 조사를 통하여 자료구축이 이루어져야 할 것이다.

Keywords

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