Identifying the impacts of anthropogenic alterations on estuary using biogeochemical characteristics-Nakdong estuary, Korea

Title
Identifying the impacts of anthropogenic alterations on estuary using biogeochemical characteristics-Nakdong estuary, Korea
Author(s)
Kim, Yunji; Kang, Jeong Won; Park, Seonyoung
KIOST Author(s)
Kim, Yunji(김윤지)Kang, Jeong Won(강정원)
Alternative Author(s)
김윤지; 강정원; 박선영
Publication Year
2021-05-13
Abstract
In estuaries, biogenic silica (BSi) content of sediment is typically controlled by dissolved silica (DSi) in riverine flows. Change in DSi flux could result in variation of nutrient ratio in estuarine waters, which may influence the planktonic communities and aquatic food webs potentially. Nakdong estuary dam was installed in mid 1980s and the phytoplankton composition might have been modified after the installation. In order to determine damming effect in Nakdong estuary, sediment cores were collected in 2015 and 2017 at tidal flats of Nakdong estuary. 210-Pb dating was conducted for each cores. The sedimentation rates in both cores were 1.0~2.5cm/yr, indicating that both sediment cores include the period of Nakdong estuary dam construction. Especially, sand content in sediment core of Eulsuk tidal flat showed decreasing trend after Nakdong estuary dam construction. In addition, C/N ratio of sediment core collected in Jinwoo-do tidal flat was abruptly decreased at 45cm depth. BSi content and BSi/TOC(total organic carbon) ratio were also decreased after dam construction, indicating that DSi flux reduction and its effects on phytoplankton composition. Therefore, BSi/TOC ratio could be is a useful tool for tracking phytoplankton composition change because sedimentary BSi content and TOC content are used as indicators of diatom productivity and total primary productivity respectively.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/41431
Bibliographic Citation
2021년도 한국해양과학기술협의회 공동학술대회(한국해양학회), pp.1511, 2021
Publisher
한국해양과학기술협의회
Type
Conference
Language
English
Publisher
한국해양과학기술협의회
Related Researcher
Research Interests

sediment chemistry,atmospheric chemistry,Chemical Oceanography,퇴적물화학,대기화학,해양화학

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