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Evaluating Limiting Nutrients through Long-term Data Analyses and Bioassay Experiments in Cheonsu Bay and Taean Sea

장기자료 분석과 생물검정실험을 이용한 천수만과 태안해역의 제한영양염 평가

  • Kim, Jin Hyun (Marine Research Center, National Park Research Institute, Korea National Park Service) ;
  • Jeong, Won Ok (Marine Research Center, National Park Research Institute, Korea National Park Service) ;
  • Shin, Yongsik (Department of Ocean System Engineering, Mokpo National Maritime University) ;
  • Jeong, Byungkwan (Marine Research Center, National Park Research Institute, Korea National Park Service)
  • 김진현 (국립공원연구원 해양연구센터) ;
  • 정원옥 (국립공원연구원 해양연구센터) ;
  • 신용식 (목포해양대학교 해양시스템공학과) ;
  • 정병관 (국립공원연구원 해양연구센터)
  • Received : 2022.03.30
  • Accepted : 2022.06.27
  • Published : 2022.06.30

Abstract

Long-term data analyses and bioassay experiments were conducted to assess limiting nutrients in Cheonsu Bay and Taean sea. First, long-term nutrient data (2004-2016) provided by the National Water Quality Monitoring Network were used to assess potential limiting nutrients. Analysis of the long-term data showed that the dissolved inorganic nitrogen/dissolved inorganic phosphate (DIN/DIP) ratio was mostly below 16, with N limitation being dominant. A subsequent analysis using the concentration ratios of N, P, and Si showed that N limitation was dominant during summer and autumn but that Si limitation occasionally occurred during winter and spring in relatively limited areas. However, the dominant limiting nutrient was not determined. The nutrient analysis of the field water collected during the bioassay experiment showed that DIN/DIP revealed P limitation at all stations in March and May, whereas N limitation was dominant in July and October. In the analysis using the concentration ratios of N, P, and Si, P and Si limitation appeared in March and May, but there were points with no dominant limiting nutrient. However, N limitation was dominant in July and October. In the bioassay experiment for assessment of the actual limiting nutrient, the results showed no specific limiting nutrient in March, whereas NH4+ and NO3- showed responses in May, July, and October, which confirmed that N was a substantial limiting nutrient directly involved in phytoplankton growth during this period.

천수만과 태안해역의 제한영양염을 평가하기 위해 장기자료 분석과 생물검정실험을 진행하였다. 우선 잠재적인 제한영양염을 평가하기 위해 국가수질측정망에서 제공되는 2004~2016년 동안의 장기 영양염 자료를 이용하였다. 장기자료의 DIN/DIP를 분석한 결과 대부분 16이하로 N 제한이 우세하였지만 N, P, Si의 농도비를 이용한 분석에서는 하계와 추계에는 N 제한이 우세하였고, 동계와 춘계에는 해역에 따라 일부 Si 제한을 보이거나 또는 제한이 나타나지 않았다. 생물검정실험 시 채집된 현장수의 영양염 분석결과, DIN/DIP는 3월과 5월에 모든 정점에서 P 제한을 나타냈고, 7월과 10월에는 N 제한이 우세하였다. N, P, Si의 농도비를 이용한 분석에서 3월과 5월은 P와 Si 제한을 보이거나 제한영양염이 나타나지 않은 정점이 존재하였으나 7월과 10월에는 N 제한이 우세하였다. 실질적인 제한영양염을 평가하기 위해 수행된 생물검정실험 결과 3월에는 특정 제한영양염이 나타나지 않았으나, 5월, 7월 10월에는 NH4+와 NO3-가 반응을 보임으로서 이 시기에는 N이 식물플랑크톤 성장에 직접 관여하는 실질적인 제한영양염임을 확인하였다.

Keywords

Acknowledgement

본 연구는 국립공원공단 국립공원연구원의 「태안해안 국립공원 해양환경변화 측정망」사업의 지원으로 수행되었습니다.

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