Microscale Spatiotemporal Variation of Reactive Oxygen Species in the Charosphere: Underlying Formation Mechanism and Their Role in CO₂ Emission

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Charosphere, a highly active zone between biochar and surrounding soil, is widely present in agricultural wildfire-affected soils, yet whether reactive oxygen species (ROS) are produced within the charosphere remains unclear. Herein, production spatiotemporal evolution of ROS were explored. In situ capture visualized gradual decrease with increasing distance from biochar/soil interface. Temporally, O2•- H2O2 contents initially increased then declined incubation time, peaking at 3.04 5.40 μmol kg-1, respectively, while •OH content decreased continuously. High-throughput sequencing revealed that dissolved (DBC) facilitated by promoting growth bacteria electron-releasing capacity, such as Bacteroidetes, Acidobacteria, Actinobacteria, Chloroflexi. Additionally, adding electron transfer-weakened DBC significantly (ANOVA, P < 0.05), demonstrating also served shuttle electron-storing materials to promote accelerating transfer. This was further confirmed via fluorescence imaging, which visually showed stronger transfer ability near soil/biochar surface. Inhibition isotope experiments critical role CO2 emissions, primarily soil organic carbon. study highlights prevalent overlooked hotspot, advancing our understanding carbon turnover soils.

Language: Английский

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Influence of soil water content on chemical and microbiological characteristics of selected riparian forests in southern Brazil

Wetlands Ecology and Management, Journal Year: 2025, Volume and Issue: 33(2)

Published: March 7, 2025

Language: Английский

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Mercury transformations by reactive oxygen species: Occurrence, detection, evidence, and challenges

Critical Reviews in Environmental Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 24

Published: March 14, 2025

Language: Английский

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Remediation strategy of biochar with different addition approaches on antibiotic resistance genes in riparian zones under dry wet alternation

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 492, P. 138207 - 138207

Published: April 9, 2025

Language: Английский

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Freezing-Induced Redistribution of Fe(II) Species within Clay Minerals for Nonlinear Variations in Hydroxyl Radical Yield and Contaminant Degradation

Journal of Earth Science, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Language: Английский

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A Novel Perspective on the Role of Hydroxyl Radicals in Soil Organic Carbon Mineralization within the Detritusphere: Stimulating C-Degrading Enzyme Activities

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Detritusphere is a hotspot of carbon cycling in terrestrial ecosystems, yet the mineralization soil organic (SOC) within this microregion associated with reactive oxygen species (ROS) remains unclear. Herein, we investigated ROS production and distribution detritusphere six representative soils evaluated their contributions to SOC mineralization. We found that was significantly correlated several chemical biological factors, including pH, water-soluble phenols, water-extractable carbon, phenol oxidase activity, surface-bound or complexed Fe(II) low-crystalline minerals, highly crystalline Fe(II)-bearing SOC. These factors collectively contributed 99.6% variation production, as revealed by redundancy analyses. Among ROS, hydroxyl radicals (•OH) were key contributors mineralization, responsible for 10.4%-38.7% CO2 emissions quenching experiments. Inhibiting •OH decreased C-degrading enzyme activities, indicating stimulates increasing activity. Structural equation modeling further demonstrated promotes activities degrading phenols unlock "enzyme latch" availability upregulate gene expression. pathways equally exceeded its direct effect. findings provide detailed insight into mechanistic •OH-mediated dynamics detritusphere.

Language: Английский

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Hotspot regions of reactive oxygen species production and their environmental impacts in periodically flooded soil environments: A review

Critical Reviews in Environmental Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 26

Published: April 26, 2025

Language: Английский

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Reactive oxygen species generation in earthworm burrows and their impact in drilosphere organic carbon mineralization

Geoderma, Journal Year: 2025, Volume and Issue: 457, P. 117301 - 117301

Published: April 22, 2025

Language: Английский

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Carbon Isotope Fractionation of Dissolved Organic Matter Due to ^•OH-Based Oxidation

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

•OH-based oxidation plays a crucial role in dissolved organic matter (DOM) transformation and carbon flux, whereas quantifying the contribution of this pathway remains challenging. Here we combined concentration with isotope analysis DOM its generated CO2 to quantify oxidation. Results showed that 13C enrichment factors (ε values) were -8.1‰ -8.9‰ for benzene ring aromatic compounds, -4.2‰ -28.9‰ lower-molecular-weight acids, -13.0‰ from sediment. The fractionation sediment reflects average ε value humic substances acids. These values more negative than those photochemical microbial processes, enabling identification mechanisms. Using an end-member mix model, found proportion mineralization total emission ranged 20.9% 39.8% 100 g/L by 5-20 mM H2O2 under pH-neutral condition within 2 h was only 2% air same conditions. We also inorganic degassing contributed greatly during This study presents new isotope-based tool quantitatively assess DOM.

Language: Английский

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Microbial advanced oxidation aroused by bacteria-algae symbiosis induced abiotic methane production in anaerobic digestion

Water Research, Journal Year: 2025, Volume and Issue: 282, P. 123776 - 123776

Published: May 3, 2025

Language: Английский

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