Dark carbon fixation in intertidal sediments: Controlling factors and driving microorganisms

Liu, Bolin; Hou, Lijun; Zheng, Yanling; Tang, Xiufeng; Mao, Tieqiang; Du, Jiabi; Bi, Qianqian; Dong, Hongpo; Yin, Guoyu; Han, Ping; Liang, Xia; Liu, Min

doi:10.1016/j.watres.2022.118381

Cited by 26 publications

(17 citation statements)

References 52 publications

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“…Compared with freshwater ecosystems, DCF rates measured in the Yangtze estuarine and coastal waters were significantly higher than those reported in deep groundwater of Sweden (3.9 × 10 −3 –1.9 × 10 −2 μmol C L −1 day −1 ; Overholt et al, 2022) and in the Maggiore Lake (1.3 × 10 −2 –2.1 × 10 −2 μmol C L −1 day −1 ; Callieri et al, 2014). Temperature is suggested to significantly affect the activity and abundance of microorganisms, thereby regulating DCF rate (Liu et al, 2022). In light of present and future anthropogenic‐driven changes in climate, there is a rising interest for exploring the response of chemoautotrophic carbon fixation to temperature, as temperature change may have the potential to severely impact microbial performance and consequently ecosystem functioning (Alster et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The disintegrations per minute (DPM) of the formalin‐fixed blank were subtracted from the samples, and the resulting DPM were converted into 14 C incorporation rates. The calculation formula is as follows (Liu et al, 2022)

R_{DCF} goodbreak= \frac{{DPM}_{inc} \times DIC \times 1.05}{{DPM}_{0} \times t},

where DPM inc is the difference between the radioactivity in the water samples and control blanks; DIC is the dissolved inorganic carbon concentration of the water sample; 1.05 is the isotope coefficient used for correcting the uptake of 14 C, since the uptake of 14 C is 5% lower than that of 12 C (Molari et al, 2013); DPM 0 is the activity of all the 14 C added; t is the incubation time.…”

Section: Methodsmentioning

confidence: 99%

“…Estuarine and coastal ecosystems exhibit extremely active redox reactions due to the influence of periodic exposure and inundation under tidal action and a large amount of anthropogenic nutrient substrates input (Liu et al, 2022). Chemoautotrophic carbon fixation in estuarine and coastal zones is estimated at approximately 328 Tg C year −1 , which represents approximately 42.6% of oceanic DCF production (Middelburg, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Potential response of dark carbon fixation to global warming in estuarine and coastal waters

Zheng

Hou

et al. 2023

Global Change Biology

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Dark carbon fixation (DCF), through which chemoautotrophs convert inorganic carbon to organic carbon, is recognized as a vital process of global carbon biogeochemical cycle. However, little is known about the response of DCF processes in estuarine and coastal waters to global warming. Using radiocarbon labelling method, the effects of temperature on the activity of chemoautotrophs were investigated in benthic water of the Yangtze estuarine and coastal areas. A dome-shaped thermal response pattern was observed for DCF rates (i.e., reduced rates at lower or higher temperatures), with the optimum temperature (T opt ) varying from about 21.9 to 32.0°C. Offshore sites showed lower T opt values and were more vulnerable to global warming compared with nearshore sites. Based on temperature seasonality of the study area, it was estimated that warming would accelerate DCF rate in winter and spring but inhibit DCF activity in summer and fall. However, at an annual scale, warming showed an overall promoting effect on DCF rates. Metagenomic analysis revealed that the dominant chemoautotrophic carbon fixation pathways in the nearshore area were Calvin-Benson-Bassham (CBB) cycle, while the offshore sites were co-dominated by CBB and 3-hydroxypr opionate/4-hydroxybutyrate cycles, which may explain the differential temperature response of DCF along the estuarine and coastal gradients. Our findings highlight the importance of incorporating DCF thermal response into biogeochemical models to accurately estimate the carbon sink potential of estuarine and coastal ecosystems in the context of global warming.

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Section: Discussionmentioning

confidence: 99%

R_{DCF} goodbreak= \frac{{DPM}_{inc} \times DIC \times 1.05}{{DPM}_{0} \times t},

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potential response of dark carbon fixation to global warming in estuarine and coastal waters

Zheng

Hou

et al. 2023

Global Change Biology

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“…For instance, sulphur-oxidizing Gammaproteobacteria (e.g. Sulfuricella denitrificans, Sulfuriferula, Thiobacillus and Sulfurivermis fontis) were chemoautotrophically active and played a dominant role in C fixation in coastal sediments (Baltar et al, 2023;Dyksma et al, 2016;Liu, Hou, et al, 2022). Meanwhile, S oxidizers were found to be the core root microbiome of saltmarsh and seagrass, and showed a direct correlation with plant species (Crump et al, 2018;Rolando et al, 2022) Plants could recruit specific soil microbiomes, and the effect of plant species on microbiomes is driven by differences in plant characteristics, plant genetics and root exudates (Wagner et al, 2016;Zancarini et al, 2021;Zhalnina et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Autotrophic CO 2 fixation is an important anabolic process in nature, and chemoautotrophic microorganisms have been considered as an important C sink in various ecosystems including ocean, groundwater and coastal sediments (Liu, Hou, et al, 2022; Middelburg, 2011; Taubert et al, 2022). Chemoautotrophic microorganisms typically thrive in redox gradient systems and obtain their energy from the oxidation of reduced compounds including ammonium, nitrite, sulphide and ferrous iron (Vasquez‐Cardenas et al, 2020), thereby coupling C, nitrogen (N) and sulphur (S) cycling processes.…”

Section: Introductionmentioning

confidence: 99%

Chemoautotrophic sulphur oxidizers dominate microbial necromass carbon formation in coastal blue carbon ecosystems

Yu,

Qian,

et al. 2023

Functional Ecology

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Coastal blue carbon (C) ecosystems are recognized as efficient natural C sinks and play key roles in mitigating global climate change. Microbially driven C, nitrogen (N) and sulphur (S) cycles are crucial for ecosystem functioning, but how microorganisms drive C sink formation and C sequestration in coastal sediments remains unclear. In this study, we conducted a comprehensive analysis of amino sugars, C, N and S cycling genes/pathways and their associated taxa in coastal sediments of native (Cyperus malaccensis and Kandelia obovata) and alien (Spartina alterniflora and Sonneratia apetala) vegetation. Compared to the alien‐vegetated coastal sediment, the native‐vegetated coastal sediment had significantly (p < 0.05) higher microbial necromass C and higher functional potentials of chemoautotrophic C fixation, C degradation, methane cycling, N2 fixation, S oxidation and sulphate reduction. Also, our analysis of coastal sediment microbiomes showed that S oxidation could be coupled with C fixation and/or nitrate/nitrite reduction. S oxidation, C degradation and C fixation were found to be key functional pathways for predicting sediment microbial necromass C. Additionally, the sulphur‐oxidizing Burkholderiales metagenome‐assembled genomes (MAGs) were a key functional group that dominated chemoautotrophic C fixation in coastal sediments. These results suggested that chemoautotrophic S oxidizers, in particular Burkholderiales with a novel lineage, might be the key microbial group that dominates microbial necromass C formation in coastal sediments through microbial anabolism (C fixation);the coupling of microbially driven C, N and S cycling processes; and the deposition of microbially derived C. This study provides novel insights into the importance of chemoautotrophic S oxidizers for microbial necromass formation and shed new light on the microbial mechanism of C sink formation in coastal ecosystems, which also has important implications for enhancing C sequestration in coastal wetlands. Read the free Plain Language Summary for this article on the Journal blog.

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Acidihalobacter

Khaleque,

Vergara,

Holmes

et al. 2024

Bergey's Manual of Systematics of Archaea and Bacteria

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A.ci.di.ha.lo.bac'ter. L. neut. adj. acidum , an acid; from L. masc. adj. acidus , sour; Gr. masc. n. hals , sea, salt; N.L. masc. n. bacter , rod; N.L. masc. n. Acidihalobacter , an acid‐loving, salt‐loving rod. Pseudomonadota / Gammaproteobacteria / Chromatiales / Ectothiorhodospiraceae / Acidihalobacter The genus Acidihalobacter comprises acidophilic, halotolerant, and chemolithoautotrophic bacteria that are able to oxidize ferrous iron and sulfur sources. Cells of these species are Gram‐stain‐negative, aerobic, and motile rods that can appear curved when under salt stress. Cells possess a single polar flagellum and can contain ferric granules. All members of the genus Acidihalobacter have been shown to grow on the sulfidic ores pyrite, chalcopyrite, and pentlandite. Grow to greater cell densities on sulfur sources than on ferrous iron. They are generally mesophilic and require minimum 0.04 M chloride ion for growth. Some species can fix atmospheric nitrogen. The known habitats are marine sediments in hydrothermal areas and acidic saline drains. DNA G + C content (mol%) : 59.9–64.5. Type species : Acidihalobacter prosperus Cárdenas et al. 2015 VP (synonym: “ Thiobacillus prosperus ” Huber and Stetter 1989.

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Dark carbon fixation in intertidal sediments: Controlling factors and driving microorganisms

Cited by 26 publications

References 52 publications

Potential response of dark carbon fixation to global warming in estuarine and coastal waters

Potential response of dark carbon fixation to global warming in estuarine and coastal waters

Chemoautotrophic sulphur oxidizers dominate microbial necromass carbon formation in coastal blue carbon ecosystems

Acidihalobacter

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