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Environmental Engineering Research 2021;26(5): 200365 DOI: https://doi.org/10.4491/eer.2020.365
Grain size distribution and chemistry of the brackish Lake sediment in Korea
I Chan Shin1,6, Tetsuji Akatsuka1, Hisayuki Azumi1, Lan Ao1, Nozomi Amahashi1, Maki Oyagi2, Noriko Ishida3, Naoshige Goto1, Masahiro Maruo1, Akihiko Yagi4, Yashshi Seike5, Seung Hyun Lee7, Sung Ae Yoon8, Jun Kil Choi9, Young Woong Byeon6, Byung Mo Lee6, Osamu Mitamura1, and Kwang Jin Cho10 
1Limnological Laboratory, Environmental Science Graduate School, University of Shiga Prefecture, Japan
2Faculty of Environmental and Information Sciences, Yokkaichi University, Japan
3Environmental Engineering Aichi Institute of Technology, Japan
4Faculty of literature, Nagoya Women’s University, Japan
5Dept. of Material Science, Faculty of Science and Engineering, Shimane University, Japan
6Dept. of Agricultural Environment, National Institute of Agricultural Sciences, RDA, Korea
7Animal & Plant Research, Nakdonggang National Institute of Biological Resources, Korea
8Dept. of Water Environment Research, National Institute of Environmental Research, Korea
9Department of Biological Science, Sangji University, Korea
10Wetlands Research Team, Wetland Center, National institute of Ecology, Korea
Corresponding Author: Kwang Jin Cho ,Tel: +82-55-530-5511, Fax: +82-55-530-5530, Email: kjcho@nie.re.kr
Received: June 28, 2020;  Accepted: October 2, 2020.
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To determine the grain size distribution and chemical characteristics of bottom surface sediments in shallow brackish lagoons, we studied sediment samples collected from the entire horizontal lake area and in vertical profiles from three stations in Lakes Youngrang and Hwajinpo, on the eastern coast of Korea. Vertical and horizontal grain size distributions of the bottom sediments indicated predominantly sand- and silt in both lakes. The vertical distribution of C/N ratios ranged from 6.14 to 11.92 in Lake Youngrang, and 6.74 to 12.34 in Lake Hwajinpo. The horizontal distribution of C/N ratios in Lake Youngrang ranged from 6.1 to 17.6, whereas they ranged from 4.4 to 12.1 in Lake Hwajinpo. C/N ratios showed locally different responses to the origin of allochthonous (partial region) and autochthonous (entire region) organic materials. Horizontally, bottom sediment with low δ13C and high δ15N in Lake Youngrang were likely to be influenced by autochthonous organic material derived from primary production, and would be affected by N inputs from sources. In contrast, high δ13C and low δ15N sediments in Lake Hwajinpo were likely to be influenced by cyanobacteria.
Keywords: Allochthonous | Autochthonous | C/N ratio | Lake Youngrang | Lake Hwajinpo | Stable isotope
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