Geochemical characteristics of halophyte (Scirpus planiculmis) habitats in the Nakdong Estuary, Korea

Geochemical characteristics of halophyte (Scirpus planiculmis) habitats in the Nakdong Estuary, Korea
김윤지; 강정원; 우한준; 박선영; 박찬미
KIOST Author(s)
Kim, Yunji(김윤지)Kang, Jeong Won(강정원)Woo, Han Jun(우한준)Park, Chan Mi(박찬미)
Publication Year
The Nakdong Estuary has experienced hydraulic and topographic changes over the last century. These alterations in the physical environment have had negative effects on habitat loss and fragmentation. The population of Scirpus planiculmis, which is a major food plant for wintering birds in Nakdong Estuary, has decreased over the last decade. To identify factors that influence S. planiculmis population, 2 short core samples (about 30cm) were collected at vegetation area (VA)and non-vegetation area (NVA) in June, 2018. In sediment cores, temperature, salinity and pH were measured at 2cm intervals in situ. Grain size, stable carbon isotope ratios (δ13C) and elements (major and minor) contents were analyzed in laboratory. Both sediment cores contained more than 80% sand but the percentage of silt and clay in NVA core was higher than VA core. The result of Principal Component Analysis indicates that sediment grain size influences the elemental composition of sediment. Salinity between VA (17.7±0.81 psu) and NVA (17.8±0.69) was similar, but pH was different between VA(6.75±0.28) and NVA (7.03±0.16). At upper 10cm (root depth of S. planiculmis: about 9cm), especially, pH of VA (6.44~6.72) was about 0.69 lower than that of NVA (7.18~7.33), indicating that sediment pH was not influenced by dam discharge but other reasons, such as secretion of acids as root exudates. δ13C of sediment cores ranged from -25.3 to -22.6.
Bibliographic Citation
한국환경과학회, pp.107, 2019
Related Researcher
Research Interests

Coastal Sedimentary Processes,Micropaleontology(Foraminifera and Pollen),Paleoenvironmental Reconstruction,연안퇴적작용,미고생물(유공충 및 화분),고환경 복원

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