자원환경지질 (Economic and Environmental Geology)

  • 제41권4호
  • /
  • Pages.393-403
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  • 2008
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
권호 표지

경기도 지역 농경지의 천부 지하수 내 질산염 오염특성과 변화

Variation in Nitrate Contamination of Shallow Groundwater in a Farmland in Gyeonggi-do, Korea

  • 이은재 (연세대학교 지구시스템과학과) ;
  • 우남칠 (연세대학교 지구시스템과학과) ;
  • 이병선 (한국농촌공사 농어촌연구원) ;
  • 김양빈 (한국농촌공사 농어촌연구원)
  • Lee, Eun-Jae (Department of Earth System Sciences, Yonsei University) ;
  • Woo, Nam-Chil (Department of Earth System Sciences, Yonsei University) ;
  • Lee, Byung-Sun (Rural Research Institute, Korea Rural Community & Agriculture Corporation) ;
  • Kim, Yang-Bin (Rural Research Institute, Korea Rural Community & Agriculture Corporation)
  • 발행 : 2008.08.28
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초록

이 연구는 우리나라의 농촌지역에서 유기비료로 살포되는 축산 분뇨가 농경지 지하수의 수질과 오염에 미치는 영향을 시공간적 변화를 중심으로 규명하기 위하여 수행되었다. 연구는 경기도의 한 농경지에서 200길 2월, 4월, 6월, 10월에는 관측정을 통한 지하수위 관측과 함께 지하수질 모니터링을 수행하였다. 그 결과 봄-여름-가을로 이어지는 계절과 축분을 뿌리는 시기에 따라서 지하수의 수질과 오염현상의 변화는 축분을 가장 많이 뿌리는 시기인 4월에 질산성 질소 농도가 가장 높게 나타났다. 그리고 지하수 내 Mn, Fe 등의 농도와 용존 유기물함량(DOC) 등을 모니터링 함으로써 천부 지하수의 산화-환원상태와 대수층 내 미생물의 활성도가 연구부지 지하수 내 질산성 질소의 농도변화에 가장 중요한 요인으로 작용하는 것으로 유추할 수 있다.

Hydrogeochemistry of groundwater was studied in order to identify the influence of cow manure, distributed to a farmland as organic fertilizer, on nitrate concentrations in shallow groundwater and its spatio-temporal variations. From monitoring wells, water levels were measured using automatic data loggers, and water samples collected and analyzed in Feb., April, June and Oct. 2007. The average electric conductivity and concentration of nitrate in the groundwater show the highest levels in April and decline in subsequent sampling times. Decreases in dissolved oxygen(DO) and nitrate concentrations from April to Oct. and corresponding increases in $HCO_3$ concentrations indicate denitrification processes by microorganisms. Spatial variation of nitrate concentration appeared to be affected by the redox conditions of groundwater controlled by geochemical reactions of Mn, Fe and DOC contents.

키워드

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