생태와환경 (Korean Journal of Ecology and Environment)

  • 제51권2호
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  • Pages.160-167
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  • 2018
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  • 2288-1115(pISSN)
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  • 2288-1123(eISSN)
한국수생태학회 (The Korean Society of Limnology)
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아시아 몬순 기후지역에 위치한 대형 인공호에서 기포형태로의 메탄 (CH4) 가스 배출량

Methane Gas Emission from an Artificial Reservoir under Asian Monsoon Climate Conditions, with a Focus on the Ebullition Pathway

  • 김기용 (강원대학교 환경융합학부) ;
  • 정성민 (강원대학교 환경융합학부) ;
  • 최영순 (한강물환경연구소 유역환경연구과) ;
  • ;
  • ;
  • 김범철 (강원대학교 환경융합학부)
  • Kim, Kiyong (Department of Environmetal Science, Kangwon National University) ;
  • Jung, Sungmin (Department of Environmetal Science, Kangwon National University) ;
  • Choi, Youngsoon (Watershed Environment Research Department, Han-River Environment Research Center) ;
  • Peiffer, Stefan (Hydrology department, University of Bayreuth) ;
  • Knorr, Klaus-Holger (Ecohydrology and Biogeochemistry Group, University of Munster) ;
  • Kim, Bomchul (Department of Environmetal Science, Kangwon National University)
  • 투고 : 2017.02.06
  • 심사 : 2018.04.10
  • 발행 : 2018.06.30
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초록

본 연구에서는 몬순 기후지역에 위치한 대형 인공호(소양호)로 유입하는 유기탄소의 양의 시간적 변화와 호수로 유입 후의 침강하는 탄소의 양을 계산하였다. 또한 이렇게 침강한 유기물이 심층 혐기성 분해 후 발생하는 메탄의 양을 측정하였다. 조사 결과 몬순 강우의 영향으로 여름철 많은 양의 유기탄소가 유입수를 통해 호수로 유입하는 사실을 확인하였고, 침강하는 유기탄소 양 또한 상당함을 확인할 수 있었다. 또한 유기탄소의 순환 및 온실가스 방출연구에 중요한 부분인 메탄 방출량을 측정한 결과 그 양이 이미 조사된 다른 호수와 비교했을 때 더 많은 양의 탄소가 메탄의 형태로 배출됨을 알 수 있었다. 향후 온실가스 저장소(inventory) 대상 선정에 있어서도 인공호의 중요성을 무시할 수 없음을 확인했다. 그러나 호수의 메탄 발생량을 정량하기 위해 메탄 기포 발생의 산발적인 특성을 고려하고 시공간적 발생의 특징을 연구하는 것은 향후 필수적이다. 더욱이 현재 우리나라 호수를 대상으로 한 메탄가스 발생의 연구는 극히 드물기 때문에 더 많은 관심이 필요하다.

The role played by reservoirs in the biogeochemical cycles of elements is a subject of ongoing debate. Recent research has revealed that reservoirs emit significant levels of greenhouse gases. To assess the importance of reservoirs in monsoon climate areas as a source of methane gas into the atmosphere, we investigated variations in organic carbon (OC) input into the reservoir, oxic state changes, and finally the amount of methane emitted (focusing on the ebullition pathway) in Lake Soyang, which is the largest reservoir in South Korea. Total organic carbon (TOC) concentrations were higher during summer after two years of heavy rainfall. The sedimentation rates of particulate organic carbon (POC) and particulate organic nitrogen (PON) were higher in the epilimnion and hypolimnion than the metalimnioin, indicating that autochthonous and allochthonous carbon made separate contributions to the TOC. During stratification, oxygen depletion occurred in the hypolimnion due to the decomposition of organic matter. Under these conditions, $H_2S$ and $CH_4$ can be released from sediment. The methane emissions from the reservoir were much higher than from other natural lakes. However, the temporal and spatial variations of methane ebullition were huge, and were clearly dependent on many factors. Therefore, more research via a well-organized field campaign is needed to investigate methane emissions.

키워드

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