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Changes in Spectroscopic and Molecular Weight Characteristics of Dissolved Organic Matter in an Agriculture Reservoir during a Summer Monsoon

장마시기에 따른 농업용 저수지 내 용존 유기물 분광특성과 분자량 변화

  • Jung, Ka-Young (Department of Environment, Energy & Geoinformatics, Sejong University) ;
  • Lee, Yun Kyung (Department of Environment, Energy & Geoinformatics, Sejong University) ;
  • Yoo, HaYoung (Department of Environment, Energy & Geoinformatics, Sejong University) ;
  • Nam, Gui-Sook (Rural Research Institute, Korea Rural Community Corporation) ;
  • Hur, Jin (Department of Environment, Energy & Geoinformatics, Sejong University)
  • 정가영 (세종대학교 환경에너지공간융합학과) ;
  • 이윤경 (세종대학교 환경에너지공간융합학과) ;
  • 유하영 (세종대학교 환경에너지공간융합학과) ;
  • 남귀숙 (한국농어촌공사 농어촌연구원) ;
  • 허진 (세종대학교 환경에너지공간융합학과)
  • Received : 2021.07.22
  • Accepted : 2021.11.19
  • Published : 2021.11.30

Abstract

In this study, we investigated the variations of dissolved organic matter (DOM) in an agricultural reservoir during the monsoon period (June to October, 2020) with respect to the organic carbon concentration (DOC), molecular weight distribution, and optical properties. The monsoon period was divided into three phases - beginning storm (BS), during storm (DS), and after storm (AS). Our results showed significant differences in the concentrations and characteristics of DOM during the summer monsoon. The DOC concentrations were decreased after the monsoon, probably due to a dilution effect. In contrast, increasing trends were observed in the specific UV absorbance (SUVA), and relative abundances of humic-like fluorescence and larger-sized compounds. These observations implied that the large-sized and humic-like organic components with terrestrial origins strongly affected the reservoir DOM after the summer monsoon. Meanwhile, biopolymer size fraction, which is associated with algal activity, became more abundant after the monsoon. These results suggest that DOM with autochthonous sources became dominant as a result of the inflow of nutrients into the reservoir after the storm. Spatial changes in DOM within the reservoir were not pronounced as much as the temporal variations. All taken, it can be concluded that the summer monsoon simply led to the decrease of DOM concentrations while the sources and the quality of DOM underwent substantial changes, which may enrich refractory organic matter in the reservoir. This study reveals the importance of in-depth DOM quality monitoring before and after summer monsoon for effective water quality management in agricultural reservoirs.

Keywords

Acknowledgement

이 논문 내용은 한국농어촌공사 농어촌연구원 과제(202004010CA-01)와 한국여성과학기술인육성재단(WISET 제2021-233호)의 지원을 받아 수행되었습니다.

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