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.

Abstract
1. 서 론
2. 재료 및 방법
    2.1. 연구대상 개요
    2.2. 수온, 염분, 그리고 강수량
    2.3. 클로로필 a
    2.4. 입자유기탄소, 입자유기질소, 그리고 탄소 안정동위원소
    2.5. 분석자료의 처리
3. 결 과
    3.1. 물리화학적 환경 요인
    3.2. 부유입자유기물질의 생지화학적 특성
4. 고찰
    4.1. 강수에 의한 강릉 남대천 물리환경 및 부유입자유기물질 특성 변동
    4.2. 강릉 남대천 하구역에서 부유입자유기물질 거동
    4.3. 강릉 남대천 하천의 연속성과 불연속성
5. 결 론
REFERENCES

• 곽정현(강릉원주대학교 해양자원육성학과/광주과학기술원 국제환경연구소) | Jung Hyun Kwak (Department of Marine Bioscience, Gangneung-Wonju National University/International Environmental Research Institute, Gwangju Institute of Science and Technology)
• 박현제(강릉원주대학교 해양자원육성학과) | Hyun Je Park (Department of Marine Bioscience, Gangneung-Wonju National University) Corresponding author