Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling
The mineralization of organic matter at the sediment plays a crucial role in ecosystem functioning by facilitating the biogeochemical cycling of carbon and nutrients. This process not only supports nutrient availability for primary production but also regulates the long-term storage of carbon within...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1521036/full |
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| author | Sung-Uk An Sung-Uk An Kyung-Tae Kim Sung-Han Kim Sung-Han Kim Ju-Wook Baek Ju-Wook Baek Hyun-Jeong Jeong Hyun-Jeong Jeong Chul-In Sun Jin Young Choi Jin Young Choi Sokjin Hong Dae In Lee Jae Seong Lee Jae Seong Lee |
| author_facet | Sung-Uk An Sung-Uk An Kyung-Tae Kim Sung-Han Kim Sung-Han Kim Ju-Wook Baek Ju-Wook Baek Hyun-Jeong Jeong Hyun-Jeong Jeong Chul-In Sun Jin Young Choi Jin Young Choi Sokjin Hong Dae In Lee Jae Seong Lee Jae Seong Lee |
| author_sort | Sung-Uk An |
| collection | DOAJ |
| description | The mineralization of organic matter at the sediment plays a crucial role in ecosystem functioning by facilitating the biogeochemical cycling of carbon and nutrients. This process not only supports nutrient availability for primary production but also regulates the long-term storage of carbon within sediments. To understand the biogeochemical processes associated with organic matter mineralization and nutrient regeneration, we estimated total and diffusive sediment oxygen uptake rates, benthic nutrient fluxes, and organic carbon (OC) budgets at four sites in the semi-enclosed Jinhae Bay (JB). The total oxygen uptake (TOU) rates ranged from 38.4 to 49.6 mmol O2 m–2 d–1, and diffusive oxygen uptake (DOU) rates ranged from 12.3 ± 1.8 to 15.1 ± 1.4 mmol O2 m–2 d–1. The average ratio of TOU : DOU ranged from 3.12 to 3.28 over JB, which suggests significant benthic faunal activities in JB sediments. The vertical flux of organic carbon ranged from 45.5 ± 7.0 to 93.0 ± 25.3 mmol C m-2 d–1, and mainly consisted of biodeposits associated with aquaculture activities. The burial flux into the sediment ranged from 3.96 ± 1.00 to 7.17 ± 1.64 mmol C m–2 d–1, and burial efficiencies were 4.25 to 15.8%, which indicated that deposited organic carbon was either mineralized in surface sediment before burial or laterally transferred by resuspension. The benthic nutrient fluxes at four sites ranged from 1.50 to 2.07 mmol m–2 d–1 for nitrogen, from 0.02 to 0.05 mmol m–2 d–1 for phosphate, and from 6.72 to 9.11 mmol m–2 d–1 for silicate. The benthic nitrogen and phosphate fluxes accounted for 82.1 to 149% and 23.1 to 57.6%, respectively, of the required levels for primary production in the water column. Our results suggest that OC oxidation in the JB sediment may significantly contribute to the biogeochemical OC cycles and tight benthic–pelagic coupling associated with nutrient regeneration. |
| format | Article |
| id | doaj-art-1410f42a46544572a9162ad50ca9aa6f |
| institution | Kabale University |
| issn | 2296-7745 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Marine Science |
| spelling | doaj-art-1410f42a46544572a9162ad50ca9aa6f2025-01-22T09:55:21ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452025-01-011110.3389/fmars.2024.15210361521036Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic couplingSung-Uk An0Sung-Uk An1Kyung-Tae Kim2Sung-Han Kim3Sung-Han Kim4Ju-Wook Baek5Ju-Wook Baek6Hyun-Jeong Jeong7Hyun-Jeong Jeong8Chul-In Sun9Jin Young Choi10Jin Young Choi11Sokjin Hong12Dae In Lee13Jae Seong Lee14Jae Seong Lee15Marine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaDepartment of Ecology and Conservation, National Marine Biodiversity Institute of Korea, Seocheon, Republic of KoreaMarine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaMarine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaDepartment of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Busan, Republic of KoreaMarine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaDepartment of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Busan, Republic of KoreaMarine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaDepartment of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Busan, Republic of KoreaMarine Environment Monitoring Team, Korea Marine Environment Management Corporation, Busan, Republic of KoreaMarine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaDepartment of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Busan, Republic of KoreaMarine Environment Research Division, National Institute of Fisheries Science (NIFS), Busan, Republic of KoreaMarine Environment Research Division, National Institute of Fisheries Science (NIFS), Busan, Republic of KoreaMarine Environment Research Center, Korea Institute of Ocean Science and Technology, Busan, Republic of KoreaDepartment of Convergence Study on the Ocean Science and Technology, Ocean Science and Technology School, Busan, Republic of KoreaThe mineralization of organic matter at the sediment plays a crucial role in ecosystem functioning by facilitating the biogeochemical cycling of carbon and nutrients. This process not only supports nutrient availability for primary production but also regulates the long-term storage of carbon within sediments. To understand the biogeochemical processes associated with organic matter mineralization and nutrient regeneration, we estimated total and diffusive sediment oxygen uptake rates, benthic nutrient fluxes, and organic carbon (OC) budgets at four sites in the semi-enclosed Jinhae Bay (JB). The total oxygen uptake (TOU) rates ranged from 38.4 to 49.6 mmol O2 m–2 d–1, and diffusive oxygen uptake (DOU) rates ranged from 12.3 ± 1.8 to 15.1 ± 1.4 mmol O2 m–2 d–1. The average ratio of TOU : DOU ranged from 3.12 to 3.28 over JB, which suggests significant benthic faunal activities in JB sediments. The vertical flux of organic carbon ranged from 45.5 ± 7.0 to 93.0 ± 25.3 mmol C m-2 d–1, and mainly consisted of biodeposits associated with aquaculture activities. The burial flux into the sediment ranged from 3.96 ± 1.00 to 7.17 ± 1.64 mmol C m–2 d–1, and burial efficiencies were 4.25 to 15.8%, which indicated that deposited organic carbon was either mineralized in surface sediment before burial or laterally transferred by resuspension. The benthic nutrient fluxes at four sites ranged from 1.50 to 2.07 mmol m–2 d–1 for nitrogen, from 0.02 to 0.05 mmol m–2 d–1 for phosphate, and from 6.72 to 9.11 mmol m–2 d–1 for silicate. The benthic nitrogen and phosphate fluxes accounted for 82.1 to 149% and 23.1 to 57.6%, respectively, of the required levels for primary production in the water column. Our results suggest that OC oxidation in the JB sediment may significantly contribute to the biogeochemical OC cycles and tight benthic–pelagic coupling associated with nutrient regeneration.https://www.frontiersin.org/articles/10.3389/fmars.2024.1521036/fulltotal oxygen uptakeorganic carbon mineralizationbenthic nutrient fluxorganic carbon budgetsemi-enclosed bay |
| spellingShingle | Sung-Uk An Sung-Uk An Kyung-Tae Kim Sung-Han Kim Sung-Han Kim Ju-Wook Baek Ju-Wook Baek Hyun-Jeong Jeong Hyun-Jeong Jeong Chul-In Sun Jin Young Choi Jin Young Choi Sokjin Hong Dae In Lee Jae Seong Lee Jae Seong Lee Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling Frontiers in Marine Science total oxygen uptake organic carbon mineralization benthic nutrient flux organic carbon budget semi-enclosed bay |
| title | Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling |
| title_full | Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling |
| title_fullStr | Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling |
| title_full_unstemmed | Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling |
| title_short | Biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi-enclosed Jinhae Bay, Korea: insights into benthic-pelagic coupling |
| title_sort | biogeochemical cycling of sedimentary organic carbon and benthic nutrient fluxes in the semi enclosed jinhae bay korea insights into benthic pelagic coupling |
| topic | total oxygen uptake organic carbon mineralization benthic nutrient flux organic carbon budget semi-enclosed bay |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1521036/full |
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