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KMID : 1024520200290050531
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Journal of the Environmental Sciences
2020 Volume.29 No. 5 p.531 ~ p.539
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Spatial and Temporal Variations of δ13C and C/N in Suspended Particulate Organic Matter in the Gangneung Namdae Stream, Korea
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Kwak Jung-Hyun
Park Hyun-Je
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Abstract
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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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KEYWORD
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Gangneung Namdae Stream, Particulate organic carbon, Particulate organic nitrogen, Carbon stable isotope, Carbon/Nitrogen ratio, Chlorophyll a, River continuum, Serial discontinuity
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