Impacts of typhoon-induced heavy rainfalls and resultant freshwater runoff on the partitioning of organic carbon oxidation and nutrient dynamics in the intertidal sediments of the Han River estuary, Yellow Sea
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Title
- Impacts of typhoon-induced heavy rainfalls and resultant freshwater runoff on the partitioning of organic carbon oxidation and nutrient dynamics in the intertidal sediments of the Han River estuary, Yellow Sea
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Author(s)
- Mok, Jin-Sook; Kim, Sung-Han; Kim, Jonguk; Cho, Hyeyoun; An, Sung-Uk; Choi, Ayeon; Kim, Bomina; Yoon, Cheolho; Thamdrup, Bo; Hyun, Jung-Ho
- KIOST Author(s)
- Kim, Sung Han(김성한); Kim, Jonguk(김종욱)
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Alternative Author(s)
- 김성한; 김종욱
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Publication Year
- 2019-11-15
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Abstract
- Occurrence of typhoons accompanied by heavy precipitation has increased for the past 40 years in northeast Asia. To elucidate the impact of three consecutive typhoon-induced heavy rainfall events and resultant freshwater runoff on the partitioning of organic carbon (C-org) oxidation and nutrient dynamics, we investigated the geochemical constituents, the rate of anaerobic C-org oxidation, sulfate reduction (SR), iron reduction (FeR) and P speciation in the intertidal mud flat of the Han River estuary, Yellow Sea. C-org oxidation by SR and FeR and their metabolic products (Sigma CO2, NH4+ H2S, Fe2+) decreased significantly (P < 0.05) during and immediately after the heavy rainfall. Additional mesocosm experiments demonstrated that potential N-2 production rates increased up to 2.4 times with increased nitrate concentrations during freshwater runoff. The results suggest that denitrification becomes a significant C-org oxidation pathway substituting for SR during high-nitrate freshwater runoff, which may remove substantial portion of the N introduced into the estuary. P speciation analysis further revealed that the concentrations of iron bound P decreased by 2.2 fold during the heavy rainfall compared to that measured before the rainfall. The results suggest that an excess supply of riverine Si keeps P from binding to Fe, thereby stimulating P release. Taking projections of enhanced rainfall events in the future into account, our results suggest that the intensified storm events and resultant rive rine runoff induces a shift of C-org oxidation pathways in the sediments, which ultimately alters C-N-P-S-Fe dynamics and may deepen N-limiting conditions in coastal ecosystems of the Yellow Sea. (C) 2019 Elsevier B.V. All rights reserved.
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ISSN
- 0048-9697
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/461
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DOI
- 10.1016/j.scitotenv.2019.07.031
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Bibliographic Citation
- SCIENCE OF THE TOTAL ENVIRONMENT, v.691, pp.858 - 867, 2019
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Publisher
- ELSEVIER
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Subject
- LOW-TIDE RAINFALL; MACROFAUNAL BURROWS; MARINE SEDIMENT; PHOSPHORUS; SALINITY; REDUCTION; RATES; IRON; SOIL; DENITRIFICATION
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Keywords
- Typhoon-induced rainfall; Freshwater Rinoff; intertidal sediment; Sulfate reduction; Iron reduction; Nutrient dynamics
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Type
- Article
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Language
- English
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Document Type
- Article
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