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Mahmood M, Kato N, Nakai S, Gotoh T, Nishijima W, Umehara A. Controlling organic carbon increase in oxygenated marine sediment by using decarburization slag. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 358:120820. [PMID: 38603849 DOI: 10.1016/j.jenvman.2024.120820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 03/08/2024] [Accepted: 04/01/2024] [Indexed: 04/13/2024]
Abstract
The chemical oxygen demand (COD) in the Seto Inland Sea, Japan has increased in the recent decades due to the increase of bottom dissolved oxygen (DO) concentration which stimulated several autotrophic microorganisms, specially sulfur oxidizing bacteria (SOB). This increased SOB activity due to the oxygenation of the bottom sediment synthesized new organic matter (OM) which contributed dissolved organic carbon to the overlying seawater. This phenomenon further led to hypoxia in some subareas in the Seto Inland Sea. Higher pH or alkaline environment has been found to be an unfavorable condition for SOB. In this research, we used decarburization slag to elevate the pH of sediment to control the SOB activity and consequently reduce OM production in the sediment. Ignition loss of the surface sediment increased from 5.14% 6.38% after 21 days of incubation with aeration; whereas the sediment showed the less ignition loss of 5.71% after 21 days when the slag was incubated in the same experimental setup. Microbial community analysis showed less SOB activity in the slag added aerated sediment which accounts for the controlled increase of OM in the sediment. An additional experiment was conducted with magnesium oxide to confirm whether elevated pH can control the OM increase in sediment due to rising DO. All these results showed that decarburization slag can elevate the pH of the sediment to a certain level which can control the SOB activity followed by controlled increase of OM in the sediment. The findings may be beneficial to control accumulation of sedimentary OM which can act as a source of organic carbon in the overlying seawater.
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Affiliation(s)
- Mukseet Mahmood
- Department of Oceanography and Coastal Sciences, Louisiana State University, Louisiana, USA
| | - Natsuki Kato
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
| | - Satoshi Nakai
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan.
| | - Takehiko Gotoh
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, Japan
| | - Wataru Nishijima
- Environmental Research and Management Center, Hiroshima University, Hiroshima, Japan
| | - Akira Umehara
- Environmental Research and Management Center, Hiroshima University, Hiroshima, Japan
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Guo Z, Li Y, Shao M, Sun T, Lin M, Zhang T, Hu K, Jiang H, Guan X. Succession and environmental response of sediment bacterial communities in the Liao River Estuary at the centenary scale. MARINE ENVIRONMENTAL RESEARCH 2023; 188:105980. [PMID: 37141709 DOI: 10.1016/j.marenvres.2023.105980] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/09/2023] [Accepted: 04/09/2023] [Indexed: 05/06/2023]
Abstract
Microbial community succession in turbulent estuarine environments is key to the understanding of microbial community development in estuaries. Centennial-scale sediment core samples collected from the Liao River Estuary (LRE) channel bar and side beaches were studied for geochemistry and 16S rRNA gene-based bacterial analyses. The results showed that bacterial community composition significantly differed between the sediments of the two sides of the channel bar, with Campilobacterota and Bacteroidota being dominant bacterial phyla in the tributary (T1, T2) and mainstream (MS1, MS2) sediment, respectively. Co-occurrence network of the bacterial community at the genus level showed more centralized and compacted topological features in tributary with weaker hydrodynamic, and the keystone taxas were Halioglobus, Luteolibacter, and Lutibacter in the bacterial community. The bacterial network structure had more edges and larger average degree in LRE sediments from the stage of the year 2016-2009 and the stage before 1939, which was possibly related to hydrodynamic conditions and nutrients. Stochastic processes (dispersal limitation) were the key factors driving bacterial community assembly in the LRE sediments. In addition, total organic carbon (TOC), total sulfur (TS), and grain size were the main deterministic factors affecting the change of bacterial community structure. Relative microbial abundance has the potential to indicate geologically historical environmental changes. This study provided a new perspective to reveal the succession and response of bacterial communities under frequent fluctuation environments.
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Affiliation(s)
- Zining Guo
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Yan Li
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Mengqi Shao
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Tongxin Sun
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Mengping Lin
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Tie Zhang
- Panjin Natural Resources Service Center, Bureau of Natural Resources of Panjin, Panjin, 120010, China
| | - Ke Hu
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China
| | - Hongchen Jiang
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China.
| | - Xiangyu Guan
- School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China.
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Aoyagi T, Katayama Y, Aizawa H, Takasaki M, Hori T. Nitrate-Driven Trophic Association of Sulfur-Cycling Microorganisms in Tsunami-Deposited Marine Sediment Revealed by High-Sensitivity 13C-Bicarbonate Probing. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:8410-8421. [PMID: 34078080 DOI: 10.1021/acs.est.0c08191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Although denitrification-dependent chemolithotrophic sulfur oxidizers proliferated in tsunami-deposited marine sediment with nitrate amendment, their ecophysiological roles in biogeochemical carbon transfer are not addressed. We employed time-resolved high-sensitivity 13C-bicarbonate probing of rRNA to unveil the carbon fixation and resulting trophic relationship of the nitrate-amended sediment microorganisms. Nitrate reduction and sulfur oxidation co-occurred along with significant decreases in the 13CO2 and dissolved bicarbonate concentrations for the first 4 days of the incubation, during which the denitrification-dependent sulfur-oxidizing chemolithotrophs, i.e., the Sulfurimonas sp. HDS01 and Thioalkalispira sp. HDS22 relatives, and the sulfate-reducing heterotrophs, i.e., the Desulfobulbus spp. and Desulfofustis glycolicus relatives, actively incorporated 13C. These indicated that the sulfur oxidizers and sulfate reducers were tightly associated with each other through the direct carbon transfer. Relatives of the fermentative Thalassomonas sediminis and the hydrolytic Pararheinheimera aquatica, in addition to various sulfur-cycling microorganisms, significantly assimilated 13C at day 14. Although the incorporation of 13C was not detected, a syntrophic volatile-fatty-acid oxidizer and hydrogenotrophic methanogens significantly expressed their 16S rRNA molecules at day 21, indicating the metabolic activation of these final decomposers under the latter nutrient-limited conditions. The results demonstrated the nitrate-driven trophic association of sulfur-cycling microorganisms and the subsequent microbial activation and diversification, triggering the restoration of the marine ecosystem function.
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Affiliation(s)
- Tomo Aoyagi
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
| | - Yoko Katayama
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Hidenobu Aizawa
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
| | - Mitsuru Takasaki
- Department of Food and Environmental Sciences, Faculty of Science and Engineering, Ishinomaki Senshu University, 1 Shinmito Minamisakai, Ishinomaki, Miyagi 986-8580, Japan
| | - Tomoyuki Hori
- Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
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