Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Spatial and Temporal Variations of δ13C and C/N in Suspended Particulate Organic Matter in the Gangneung Namdae Stream, Korea

강릉 남대천 부유입자유기물의 탄소안정동위원소 비와 C/N 비의 시·공간 변동

  • Kwak, Jung Hyun (Department of Marine Bioscience, Gangneung-Wonju National University) ;
  • Park, Hyun Je (Department of Marine Bioscience, Gangneung-Wonju National University)
  • 곽정현 (강릉원주대학교 해양자원육성학과) ;
  • 박현제 (강릉원주대학교 해양자원육성학과)
  • Received : 2020.03.27
  • Accepted : 2020.04.29
  • Published : 2020.05.31
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Abstract

To understand the composition, quantity, and quality of Suspended Particulate Organic Matter (SPOM) in the Gangneung Namdae Stream, Korea, we examined spatiotemporal variations in water temperature, salinity, chlorophlly a (Chl a), Particulate Organic Carbon (POC) and nitrogen (PON), and carbon stable isotope (δ13C) of SPOM at six stations in June (pre-monsoon), July (monsoon), and September (post-monsoon) 2017. With increasing precipitation, the average POC and C/N values increased significantly in July than in June. In September, the values decreased with decreasing precipitation. The δ13C values showed irregular spatiotemporal fluctuations among the stations and periods, thereby suggesting a greater contribution of autochthonous organic matter to the pool of SPOM than that of allochthonous organic matter derived from upstream. In addition, the large and irregular changes in POC, C/N ratio, C:Chl a, and δ13C compared to that of PON were observed for all periods among the stations, indicating a serial discontinuity of the stream. Our results suggest that the Gangneung Namdae Stream is significantly influenced by the increase in freshwater discharge caused by heavy rainfalls during the summer monsoon and post-monsoon periods.

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References

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