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

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(43), P. 16340 - 16347

Published: Oct. 19, 2023

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

Language: Английский

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Nitrifying niche in estuaries is expanded by the plastisphere

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 12, 2024

The estuarine plastisphere, a novel ecological habitat in the Anthropocene, has garnered global concerns. Recent geochemical evidence pointed out its potential role influencing nitrogen biogeochemistry. However, biogeochemical significance of plastisphere and mechanisms regulating cycling remain elusive. Using

Language: Английский

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Ammonium-derived nitrous oxide is a global source in streams

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: May 14, 2024

Abstract Global riverine nitrous oxide (N 2 O) emissions have increased more than 4-fold in the last century. It has been estimated that hyporheic zones small streams alone may contribute approximately 85% of these N O emissions. However, mechanisms and pathways controlling production stream ecosystems remain unknown. Here, we report ammonia-derived pathways, rather nitrate-derived are dominant sources (69.6 ± 2.1%) agricultural around world. The fluxes mainly positive correlation with ammonia. potential metabolic metagenome-assembled genomes (MAGs) provides evidence nitrifying bacteria contain greater abundances production-related genes denitrifying bacteria. Taken together, this study highlights importance mitigating agriculturally derived ammonium low-order models need to better represent for accurately estimating predicting

Language: Английский

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Fe(II) Oxidation Shaped Functional Genes and Bacteria Involved in Denitrification and Dissimilatory Nitrate Reduction to Ammonium from Different Paddy Soils

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(50), P. 21156 - 21167

Published: Dec. 8, 2023

Microbial nitrate reduction can drive Fe(II) oxidation in anoxic environments, affecting the nitrous oxide emission and ammonium availability. The nitrate-reducing usually causes severe cell encrustation via chemodenitrification potentially inhibits bacterial activity due to blocking effect of secondary minerals. However, it remains unclear how subsequent affect functional genes bacteria for denitrification dissimilatory (DNRA). Here, were enriched from different paddy soils with without under conditions. addition decelerated increased NO2– accumulation, rapid periplasm on surface. N2O accumulation was lower treatment than that only, although proportions NH4+ reduced NO3– low (3.25% ∼ 6.51%) at end incubation regardless addition. dominant varied conditions, while shaped a similar microbial community, including Dechloromonas, Azospira, Pseudomonas. relative abundance napAB, nirS, norBC, nosZ, nirBD but decreased narG nrfA, suggesting favored NO2–-to-NH4+ cytoplasm. Dechloromonas dominated NO2–-to-N2O reduction, Thauera mediated periplasmic cytoplasmic during oxidation. showed much genera, resulting slow limited production. These findings provide new insights into response DNRA environments.

Language: Английский

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Relative contribution of ammonia-oxidizing bacteria and denitrifying fungi to N2O production during rice straw composting with biochar and biogas residue amendments

Bioresource Technology, Journal Year: 2023, Volume and Issue: 390, P. 129891 - 129891

Published: Oct. 18, 2023

Language: Английский

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Agro-technologies for greenhouse gases mitigation in flooded rice fields for promoting climate smart agriculture

Environmental Pollution, Journal Year: 2024, Volume and Issue: 350, P. 123973 - 123973

Published: April 16, 2024

Language: Английский

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Microbial pathways of nitrous oxide emissions and mitigation approaches in drylands

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 354, P. 120393 - 120393

Published: Feb. 15, 2024

Language: Английский

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Electrocatalytic nitrate reduction using iron single atoms for sustainable ammonium supplies to increase rice yield

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(50)

Published: Dec. 4, 2024

Increasing food production and ensuring drinking water safety have always been a focus of attention, especially for people in underdeveloped regions the world. Traditional excessive fertilizer applications increased crop yield but also caused groundwater nitrate pollution. Agricultural irrigating is an important reservoir nitrogen (N) (e.g., nitrate) accumulation after fertilization. Ammonium (NH 4 + -N) more readily absorbed N form by rice than (NO 3 − -N). In this study, we proposed strategy using iron single-atom catalysts (Fe-SAC) to selectively reduce NO -N NH from real paddy field provide sustainable supplies uptakes, thereby highlighting decreasing mitigating Then, constructed solar-energy-driven electrochemical reactor reduction, with Fe single atom as core catalyst, achieved average selectivity 80.2 ± 2.6% no additional energy input. Sustainable resulted 30.4 % increase 100-grain weight cultivated 50% decrease application those fertilization group pot experiment, which were one best values ever reported. Furthermore, 15 isotope tracing results indicated use efficiency (NUE) 71.2 3.2%. played key role promoting root development contributed high NUE. Our study shares unique insights increasing grain yield, reducing applications, preventing leaching into groundwater.

Language: Английский

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Oxygen Availability Governs the Mitigating Effect of 3,4-Dimethylpyrazole Phosphate on Nitrous Oxide Emissions from Paddy Soils under Various Water Managements

Journal of Agricultural and Food Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Alternate wetting and drying (AWD) frequently triggers nitrous oxide (N2O) emissions from paddy fields, while the inhibitory effect of 3,4-dimethylpyrazole phosphate (DMPP) on N2O under various water managements remains uncertain. Here, we evaluated effects DMPP associated biological indicators three managements: continuous flooding (CF), mild AWD (Mi-AWD), moderate (Mo-AWD). The Mi-AWD Mo-AWD practices increased by 2- 0.9-fold compared to CF treatment, respectively, due enhanced oxygen availability, facilitating coupled nitrification-denitrification. application notably reduced in treatments, attributed reductions nitrifier abundances, nitrification rates, nitrate accumulation. Nevertheless, failed suppress and, thereby, treatment. Overall, effectively mitigates oxygen-rich rather than anaerobic conditions, highlighting that trade-offs between water-saving irrigation mitigation can be overcome via inhibitors application.

Language: Английский

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Illuminating the Nexus Between Non-Biodegradable Microplastics and Soil Nitrogen Dynamics: A Modulation Through Plant-Derived Organic Matter

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: unknown, P. 137913 - 137913

Published: March 1, 2025

Language: Английский

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