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2019 Vol.52, Issue 11 Preview Page

Research Article

Effects of streambed geomorphology on nitrous oxide flux are influenced by carbon availability

하상 미지형에 따른 N2O 발생량 변화 효과에 대한 탄소 가용성의 영향

Jongmin Koa
,
Youngsun Kimb
,
Un Jic
,
Hojeong Kangd*
고 종민a
,
김 영선b
,
지 운c
,
강 호정d*
aMaster’s course, Department of Civil Engineering, Yonsei University
bResearcher, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology
cResearcher, Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology
dProfessor, Department of Civil Engineering, Yonsei University
a연세대학교 건설환경공학과 석사과정
b한국건설기술연구원 국토보전연구본부 연구원
c한국건설기술연구원 국토보전연구본부 연구원
d연세대학교 건설환경공학과 교수
* Corresponding Author
30 November 2019. pp. 917-929
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Abstract

Denitrification in streams is of great importance because it is essential for amelioration of water quality and accurate estimation of N2O budgets. Denitrification is a major biological source or sink of N2O, an important greenhouse gas, which is a multi-step respiratory process that converts nitrate (NO3-) to gaseous forms of nitrogen (N2 or N2O). In aquatic ecosystems, the complex interactions of water flooding condition, substrate supply, hydrodynamic and biogeochemical properties modulate the extent of multi-step reactions required for N2O flux. Although water flow in streambed and residence time affect reaction output, effects of a complex interaction of hydrodynamic, geomorphology and biogeochemical controls on the magnitude of denitrification in streams are still illusive. In this work, we built a two-dimensional water flow channel and measured N2O flux from channel sediment with different bed geomorphology by using static closed chambers. Two independent experiments were conducted with identical flume and geomorphology but sediment with differences in dissolved organic carbon (DOC). The experiment flume was a circulation channel through which the effluent flows back, and the size of it was 37 m x 1.2 m x 1 m. Five days before the experiment began, urea fertilizer (46% N) was added to sediment with the rate of 0.5 kg N/m2. A sand dune (1 m length and 0.15 m height) was made at the middle of channel to simulate variations in microtopography. In high- DOC experiment, N2O flux increases in the direction of flow, while the highest flux (14.6 ± 8.40μg N2O-N/m2 hr) was measured in the slope on the back side of the sand dune. followed by decreases afterward. In contrast, low DOC sediment did not show the geomorphological variations. We found that even though topographic variation influenced N2O flux and chemical properties, this effect is highly constrained by carbon availability.

Keywords
Denitrification
Stream
Geomorphology
Microtopography
Nitrous oxide
Carbon availability

하천의 탈질은 수질 개선과 정확한 아산화질소(N2O) 발생량 추정에 관련해서 매우 중요한 역할을 한다. 탈질과정은 질소 산화물(NO3-)을 다수의 단계를 걸쳐 기체 질소(N2 또는 N2O)로 변화시키는 호흡과정으로, 강력한 온난화기체인 N2O의 주요한 생물학적 배출 또는 흡수 과정이다. 수생태계에서는, 물의 범람, 기질 공급과 유체역학적, 생지화학적 특성의 복잡한 상호작용이 탈질 과정과 다단계 반응의 정도에 따라 중간산물인 N2O 발생량(flux)을 조절한다. 이처럼 기질의 농도뿐만 아니라 하상의 물 흐름과 체류시간이 반응 산물에 영향을 미치지만, 하천에서 탈질 정도를 조절하는 유체역학적 특성과 지형학적, 생지화학적 인자의 상호작용에 대한 연구 결과는 아직 제한적이다. 본 실험은 미세지형 변화의 영향을 모의하기 위해서 2차원 실험 수로에 사구를 형성하여 하상 지형에 따라, 정지상태의 폐쇄형 챔버를 이용해 N2O 발생량을 측정하였다. 또한 기질과의 미세지형의 상호작용을 확인하기 위해서 두 독립된 실험은 같은 수로와 지형 구조를 가지지만 다른 용존 유기탄소(DOC) 농도로 설계하였다. 또한 얻어진 자료를 토대로 Random Forest 모델을 활용하여 N2O 발생량과 조절인자를 추정하였다. 높은 DOC 농도 실험에선, N2O 발생량이 흐름 방향을 따라 증가하다 사구 뒤쪽 경사에서 가장 높은 발생량(14.6 ± 8.40 μg N2O-N/m2 hr)이 측정되며, 그 이후로 감소하는 경향을 보인다. 또한 사구 뒤쪽 경사에서 암모늄 농도가 31.0 ± 6.24 μg-N/g dry soil로 가장 높으며 N2O 발생량과 유사한 경향을 나타낸다. 반면에, 낮은 DOC 토양은 지형학적 변화에 따른 N2O 발생량과 암모늄의 변화를 나타내지 않았으며 발생량과 농도 또한 낮게 나타났다. 따라서 본 실험을 통해 비록 지형적 변화는 N2O 발생량과 화학적 특성에 영향을 미쳤지만, 그 효과는 탄소 가용성에 의해 제한된다는 것을 확인하였다.

키워드
탈질
하천
지형학적 특징
미세지형
아산화질소
탄소 이용성
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 52
  • No :11
  • Pages :917-929
  • Received Date : 2019-08-09
  • Revised Date : 2019-09-30
  • Accepted Date : 2019-09-30
  • DOI :https://doi.org/10.3741/JKWRA.2019.52.11.917
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