Organic carbon preservation in wetlands: Iron oxide protection vs. thermodynamic limitation

Sun, Fangyuan; Ma, Chao; Yu, Guanghui; Kuzyakov, Yakov; Lang, Yunchao; Fu, Pingqing; Guo, Lijun; Teng, H. Henry; Liu, Cong‐Qiang

doi:10.1016/j.watres.2023.120133

Cited by 15 publications

(3 citation statements)

References 91 publications

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“…Spatiotemporal variations of the DOC concentration showed a similar trend of Fe(II) phase conversion (Figure S8b). The reductive dissolution of Fe minerals is often coupled with organic matter (OM) cycling because microorganisms can utilize OM as electron donors to reduce Fe(III) . The content of dissolved organic matter decreased during the extended incubation time, which could be due to this type of microbial consumption and the possible coprecipitation with secondary Fe minerals. − …”

Section: Resultsmentioning

confidence: 99%

“…The reductive dissolution of Fe minerals is often coupled with organic matter (OM) cycling because microorganisms can utilize OM as electron donors to reduce Fe(III). 33 The content of dissolved organic matter decreased during the extended incubation time, which could be due to this type of microbial consumption and the possible coprecipitation with secondary Fe minerals. 34−36 The spatiotemporal variations of the • OH production capacity were examined for both aqueous and solid phases at varying soil depths (Figure 1).…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Dynamic Production of Hydroxyl Radicals during the Flooding–Drainage Process of Paddy Soil: An In Situ Column Study

Huang,

Chen,

Zhu

et al. 2023

Environ. Sci. Technol.

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Frequent cycles of flooding and drainage in paddy soils lead to the reductive dissolution of iron (Fe) minerals and the reoxidation of Fe(II) species, all while generating a robust and consistent output of reactive oxygen species (ROS). In this study, we present a comprehensive assessment of the temporal and spatial variations in Fe species and ROS during the flooding–drainage process in a representative paddy soil. Our laboratory column experiments showed that a decrease in dissolved O2 concentration led to rapid Fe reduction below the water–soil interface, and aqueous Fe(II) was transformed into solid Fe(II) phases over an extended flooding time. As a result, the •OH production capacity of liquid phases was reduced while that of solid phases improved. The •OH production capacity of solid phases increased from 227–271 μmol kg–1 (within 1–11 cm depth) to 500–577 to 499–902 μmol kg–1 after 50 day, 3 month, and 1 year incubation, respectively. During drainage, dynamic •OH production was triggered by O2 consumption and Fe(II) oxidation. ROS-trapping film and in situ capture revealed that the soil surface was the active zone for intense H2O2 and •OH production, while limited ROS production was observed in the deeper soil layers (>5 cm) due to the limited oxygen penetration. These findings provide more insights into the complex interplay between dynamic Fe cycling and ROS production in the redox transition zones of paddy fields.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Dynamic Production of Hydroxyl Radicals during the Flooding–Drainage Process of Paddy Soil: An In Situ Column Study

Huang,

Chen,

Zhu

et al. 2023

Environ. Sci. Technol.

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“…It has been shown that Fe oxides exhibit a preferential association with lignin-derived organic carbon (OC) relative to labile polysaccharide-derived OC . This preference arises from the higher concentration of carboxylic and aromatic C in lignin-derived OC, facilitating its steady complexation with reactive Fe. , With the increase of soil salinity, the landscape of salt marsh tended to be sandier, indicating soils with poor aggregate stability (Figure S5). The decrease in total GRSP contents weakens the mineral protection, so that the contribution of plant lignin to SOC is reduced (Figure ).…”

Section: Discussionmentioning

confidence: 99%

Microbial Necromass, Lignin, and Glycoproteins for Determining and Optimizing Blue Carbon Formation

Li,

Song,

Xia

et al. 2023

Environ. Sci. Technol.

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Coastal wetlands contribute to the mitigation of climate change through the sequestration of "blue carbon". Microbial necromass, lignin, and glycoproteins (i.e., glomalinrelated soil proteins (GRSP)), as important components of soil organic carbon (SOC), are sensitive to environmental change. However, their contributions to blue carbon formation and the underlying factors remain largely unresolved. To address this paucity of knowledge, we investigated their contributions to blue carbon formation along a salinity gradient in coastal marshes. Our results revealed decreasing contributions of microbial necromass and lignin to blue carbon as the salinity increased, while GRSP showed an opposite trend. Using random forest models, we showed that their contributions to SOC were dependent on microbial biomass and resource stoichiometry. In N-limited saline soils, contributions of microbial necromass to SOC decreased due to increased N-acquisition enzyme activity. Decreases in lignin contributions were linked to reduced mineral protection offered by short-range-ordered Fe (Fe SRO ). Partial leastsquares path modeling (PLS-PM) further indicated that GRSP could increase microbial necromass and lignin formation by enhancing mineral protection. Our findings have implications for improving the accumulation of refractory and mineral-bound organic matter in coastal wetlands, considering the current scenario of heightened nutrient discharge and sea-level rise.

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Interfacial processes and mechanisms of synergistic degradation of dichlorobiphenyl by white rot fungi and magnetite nanoparticles

Chang,

Yu,

Liu

2023

Sci. China Earth Sci.

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Organic carbon preservation in wetlands: Iron oxide protection vs. thermodynamic limitation

Cited by 15 publications

References 91 publications

Dynamic Production of Hydroxyl Radicals during the Flooding–Drainage Process of Paddy Soil: An In Situ Column Study

Dynamic Production of Hydroxyl Radicals during the Flooding–Drainage Process of Paddy Soil: An In Situ Column Study

Microbial Necromass, Lignin, and Glycoproteins for Determining and Optimizing Blue Carbon Formation

Interfacial processes and mechanisms of synergistic degradation of dichlorobiphenyl by white rot fungi and magnetite nanoparticles

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