Microbial-mediated contribution of kelp detritus to different forms of oceanic carbon sequestration

Feng, Xiuting; Li, Hongmei; Xiong, Tian Ying; Shi, Xiaoyong; He, Chen; Shi, Quan; Jiao, Nianzhi; Zhang, Yongyu

doi:10.1016/j.ecolind.2022.109186

Cited by 24 publications

(20 citation statements)

References 62 publications

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“…This suggests that a substantial part of the released POC was promptly transformed into DOC and DIC by macroalgae-associated microorganisms, which are known to degrade POC into DOC and mineralize DOC into DIC. 5,53 Moreover, there was a clear rise in the DOC during the POC degradation experiment, but not all POC can be degraded. After 90 days of microbial degradation, ∼29% of the POC remained (Figure S13).…”

Section: Discussionmentioning

confidence: 97%

“…We showed that DOC, POC, and DIC in the seawater increased significantly by 72, 246, and 39%, respectively, during 1-week cultivation (Table S4), which is consistent with previous field observations. , Interestingly, POC only increased significantly during the first 4 days, it subsequently decreased by 25%, whereas DOC and DIC increased continuously. This suggests that a substantial part of the released POC was promptly transformed into DOC and DIC by macroalgae-associated microorganisms, which are known to degrade POC into DOC and mineralize DOC into DIC. , Moreover, there was a clear rise in the DOC during the POC degradation experiment, but not all POC can be degraded. After 90 days of microbial degradation, ∼29% of the POC remained (Figure S13).…”

Section: Discussionmentioning

confidence: 99%

“…However, the massive macroalgae might also have a positive effect by helping to sequester carbon in the ocean. This is because macroalgae can absorb CO 2 from the atmosphere and contribute different forms of carbon to the seawater and sediment, thereby enhancing the carbon stock in the ocean . The different forms of carbon that are contributed by macroalgae include DOC, particulate organic carbon (POC), dissolved inorganic carbon (DIC), and detrital carbon.…”

Section: Introductionmentioning

confidence: 99%

“…This is because macroalgae can absorb CO 2 from the atmosphere and contribute different forms of carbon to the seawater and sediment, thereby enhancing the carbon stock in the ocean. 5 The different forms of carbon that are contributed by macroalgae include DOC, particulate organic carbon (POC), dissolved inorganic carbon (DIC), and detrital carbon. In fact, a large portion of these different forms of macroalgae-derived carbon are unstable and they are readily returned to the atmosphere by physicochemical or microbial degradation.…”

Section: Introductionmentioning

confidence: 99%

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Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Feng

Xiong

et al. 2022

Environ. Sci. Technol.

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Despite green tides (or macroalgal blooms) having multiple negative effects, it is thought that they have a positive effect on carbon sequestration, although this aspect is rarely studied. Here, during the world’s largest green tide (caused by Ulva prolifera) in the Yellow Sea, the concentration of dissolved organic carbon (DOC) increased by 20–37% in intensive macroalgal areas, and thousands of new molecular formulas rich in CHNO and CHOS were introduced. The DOC molecular species derived from U. prolifera constituted ∼18% of the total DOC molecular species in the seawater of bloom area, indicating the profound effect that green tides have on shaping coastal DOC. In addition, 46% of the macroalgae-derived DOC was labile DOC (LDOC), which had only a short residence time due to rapid microbial utilization. The remaining 54% was recalcitrant DOC (RDOC) rich in humic-like substances, polycyclic aromatics, and highly aromatic compounds that resisted microbial degradation and therefore have the potential to play a role in long-term carbon sequestration. Notably, source analysis showed that in addition to the microbial carbon pump, macroalgae are also an important source of RDOC. The number of RDOC molecular species contributed by macroalgae even exceed (77 vs 23%) that contributed by microorganisms.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Feng

Xiong

et al. 2022

Environ. Sci. Technol.

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“…Finally, the chemical composition of DOC itself also affects its lability, and this composition is not well understood for most macroalgae. Macroalgae DOC contains high quantities of phenolic and humic‐like compounds, which are typically more recalcitrant than other molecules (Wada et al ., 2008; Buck‐Wiese et al ., 2022; Feng et al ., 2022).…”

Section: Main Macroalgal Carbon Sequestration Pathwaysmentioning

confidence: 99%

Carbon sequestration and climate change mitigation using macroalgae: a state of knowledge review

et al. 2023

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The conservation, restoration, and improved management of terrestrial forests significantly contributes to mitigate climate change and its impacts, as well as providing numerous co‐benefits. The pressing need to reduce emissions and increase carbon removal from the atmosphere is now also leading to the development of natural climate solutions in the ocean. Interest in the carbon sequestration potential of underwater macroalgal forests is growing rapidly among policy, conservation, and corporate sectors. Yet, our understanding of whether carbon sequestration from macroalgal forests can lead to tangible climate change mitigation remains severely limited, hampering their inclusion in international policy or carbon finance frameworks. Here, we examine the results of over 180 publications to synthesise evidence regarding macroalgal forest carbon sequestration potential. We show that research efforts on macroalgae carbon sequestration are heavily skewed towards particulate organic carbon (POC) pathways (77% of data publications), and that carbon fixation is the most studied flux (55%). Fluxes leading directly to carbon sequestration (e.g. carbon export or burial in marine sediments) remain poorly resolved, likely hindering regional or country‐level assessments of carbon sequestration potential, which are only available from 17 of the 150 countries where macroalgal forests occur. To solve this issue, we present a framework to categorize coastlines according to their carbon sequestration potential. Finally, we review the multiple avenues through which this sequestration can translate into climate change mitigation capacity, which largely depends on whether management interventions can increase carbon removal above a natural baseline or avoid further carbon emissions. We find that conservation, restoration and afforestation interventions on macroalgal forests can potentially lead to carbon removal in the order of 10's of Tg C globally. Although this is lower than current estimates of natural sequestration value of all macroalgal habitats (61–268 Tg C year−1), it suggests that macroalgal forests could add to the total mitigation potential of coastal blue carbon ecosystems, and offer valuable mitigation opportunities in polar and temperate areas where blue carbon mitigation is currently low. Operationalizing that potential will necessitate the development of models that reliably estimate the proportion of production sequestered, improvements in macroalgae carbon fingerprinting techniques, and a rethinking of carbon accounting methodologies. The ocean provides major opportunities to mitigate and adapt to climate change, and the largest coastal vegetated habitat on Earth should not be ignored simply because it does not fit into existing frameworks.

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Seaweed farming environments do not always function as CO2 sink under synergistic influence of macroalgae and microorganisms

Xiong,

Li,

et al. 2024

Agriculture, Ecosystems & Environment

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Microbial-mediated contribution of kelp detritus to different forms of oceanic carbon sequestration

Cited by 24 publications

References 62 publications

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Carbon sequestration and climate change mitigation using macroalgae: a state of knowledge review

Seaweed farming environments do not always function as CO2 sink under synergistic influence of macroalgae and microorganisms

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