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http://dx.doi.org/10.17663/JWR.2019.21.2.125

Geochemical Characteristics of Scirpus planiculmis Habitats in Nakdong Estuary, Korea  

Kim, Yunji (Korea Institute of Ocean Science & Technology)
Kang, Jeongwon (Korea Institute of Ocean Science & Technology)
Choi, Jae Ung (Korea Institute of Ocean Science & Technology)
Park, Chan Mi (Korea Institute of Ocean Science & Technology)
Woo, Han Jun (Korea Institute of Ocean Science & Technology)
Publication Information
Journal of Wetlands Research / v.21, no.2, 2019 , pp. 125-131 More about this Journal
Abstract
The Nakdong Estuary has experienced hydraulic and topographic changes over the last century, which have had negative effects of habitat loss and fragmentation. The population of Scirpus planiculmis, a major food plant for wintering birds in Nakdong Estuary, has decreased over the last decade. To identify factors that influence S. planiculmis population, 6 short core samples (about 30cm) were collected in June and August, 2018. The sand percentage was over 80% in every samples and the average sediment salinity in June and August were $17.8{\pm}1.12psu$ and $18.4{\pm}1.83psu$, respectively. ${\delta}^{13}C$ of sediment cores varied from -25.4‰ to -22.6‰ which fall within the estuarine particulate organic matters. In cores collected in Eulsuk area, the highest ${\delta}^{13}C$ values were observed at the surface (0~1cm) indicating inputs of marine POM (particulate organic matter) to the Nakdong Estuary. No significant difference between vegetation and non-vegetation stations was observed in every items we investigated which might indicate that the physicochemical environment of vegetation area is almost same as that of non-vegetation area. Therefore, the high sand percentage and sediment salinity of Nakdong Estuary might affect the reduction in S. planiculmis population.
Keywords
Nakdong Estuary; Scirpus planiculmis; sediment core; carbon stable isotope;
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