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Article

Rates and Controls of Organic Matter Mineralization and Benthic Nutrient Release in the Coastal Sediment Near Lake Shihwa

시화호 인근 연안 퇴적물의 유기물 분해 특성, 저층 영양염 용출 및 조절요인

JAE-HYUK SHIN12
,
SUNG-UK AN3
,
JAE-HOON CHOI4
,
HYO-JIN LEE5
,
SEUNG-BUHM WOO6
,
JUNG-HO HYUN7
,
SUNG-HAN KIM89*
신 재혁12
,
안 성욱3
,
최 재훈4
,
이 효진5
,
우 승범6
,
현 정호7
,
김 성한89*
1Engineer, Geosystem Research Corporation, Gunpo 15807, Korea
2Graduate Student, Depertment of Marine Sciences and Convergence Engineering, Hanyang University, Ansan 15588, Korea
3Postdoctoral Researcher, Depertment of Marine Sciences and Convergence Engineering, Hanyang University, Ansan 15588, Korea
4Senior Engineer, Geosystem Research Corporation, Gunpo15807, Korea
5Principal Engineer, Geosystem Research Corporation, Gunpo15807, Korea
6Professor, Department of Oceanography, Inha University, Incheon 22212, Korea
7Professor, Depertment of Marine Sciences and Convergence Engineering, Hanyang University, Ansan 15588, Korea
8Senior Researcher, Marine Environmental Research Center, Korea Institute of Ocean Science & Technology, Busan Metropolitan City 49111, Korea
9Senior Researcher, Depertment of Marine Sciences and Convergence Engineering, Hanyang University, Ansan 15588, Korea
1(주)지오시스템리서치 전임
2한양대학교 해양융합공학과 대학원생
3한양대학교 해양융합공학과 박사후연구원
4(주)지오시스템리서치 선임
5(주)지오시스템리서치 책임
6인하대학교 해양과학과 교수
7한양대학교 해양융합공학과 교수
8한국해양과학기술원 해양환경연구센터 선임연구원
9한양대학교 해양융합공학과 선임연구원
*Corresponding Author
31 May 2021. pp. 110-123
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Abstract

We investigated geochemical constituents of pore-water and sediment, rates of organic carbon (Corg) oxidation and sulfate reduction (SR), and benthic nutrient flux (BNF) to elucidate characteristic of Corg oxidation and its control in the coastal area near Lake Shihwa. The study sites were selected in the vicinity of Soraepogu (E0), Songdo tidalflat (E1) and Oido dock (E3) and in front of floodgate Shihwa tidal plant (E5). The Corg contents in the sediments and concentrations of ammonium and phosphate in pore water exhibited the highest value at EO, and gradually decreased toward the outer sea (E1, E3, E5). Rates of anaerobic Corg oxidation (260.6 mmol C m-2 d-1) and SR (91.4 mmol S m-2 d-1) at E0 were 4–9 and 6-54 times higher than at the site of outer sea (E1, E3, E5) . Rates of SR at E3 and E5 accounted for 11-23% of anaerobic Corg oxidation, whereas it comprised 47-70% of anaerobic Corg oxidation at E0 and E1. Rates of Corg oxidation and SR showed a highly positive correlation with the concentration of dissolved organic carbon (r2 = 0.795 and 0.777, respectively). The BNF at E0, E1, and E3 accounted for 120–510% and 26–178%, respectively, of the N and P required for primary production in the water column. Overall results suggest that the Corg oxidation in the sediment controlled by concentration of dissolved organic carbon in the pore water and the excessive Corg oxidation stimulates the benthic nutrient flux, which may cause a phytoplankton bloom in the water column.

Keywords
Organic carbon
Organic carbon oxidation
Sulfate reduction
Benthic nutrient flux
Lake Shihwa

시화호 인근 연안 퇴적물에서 유기물 분해 특성, 퇴적물로부터의 영양염 용출 및 주요 조절요인을 파악하기 위해 공극수와 퇴적물 내 지화학 성분, 혐기성 유기물 분해율, 황산염 환원율 및 저층 영양염 용출률을 측정하였다. 연구정점은 소래포구 인근 정점(E0), 송도갯벌 정점(E1), 오이도 선착장 부근 정점(E3), 시화 조력발전소 수문 앞 정점(E5)으로 선정하였다. 유기탄소와 공극수 내 암모니아, 인산염 농도는 정점 E0에서 가장 높게 나타났으며, 외측 해역(정점 E1, E3, E5)으로 갈수록 점진적으로 감소하였다. 혐기성 유기물 분해율과 황산염 환원율은 정점 E0에서 각각 260.6 mmol C m-2 d-1와 91.4 mmol S m-2 d-1로 외측 정점들보다 각각 4–9배, 6–54배 높게 나타났다. 혐기성 유기물 분해에서 황산염 환원이 차지하는 비율은 정점 E3, E5에서 11–23%로 미미한 것으로 나타났으나, 정점 E0, E1에서는 47-70%로 황산염 환원에 의해 혐기성 유기물 분해가 주도되는 것으로 나타났다. 또한, 혐기성 유기물 분해율과 황산염 환원율은 용존 유기탄소와 상관성이 매우 높은 것으로 나타났다(r2 = 0.795, 0.777). 한편, 정점 E0, E1, E3에서 퇴적물로부터 용출된 무기질소와 무기인은 각각 일차생산자가 요구하는 무기질소와 무기인의 120–510%와 26–178%를 공급하는 것으로 나타났다. 이상의 결과들은, 시화호 인근 연안 퇴적물 내 유기물 분해는 이용 가능한 용존 유기탄소의 공급에 의해 조절되고 있으며, 과도한 유기물 분해는 저층 영양염 용출을 촉진시켜 부영양화를 야기할 수 있음을 의미한다.

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 26
  • No :2
  • Pages :110-123
  • Received Date : 2020-02-01
  • Revised Date : 2021-05-04
  • Accepted Date : 2021-05-06
  • DOI :https://doi.org/10.7850/jkso.2021.26.2.110
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