A Critical Review on the Multiple Roles of Manganese in Stabilizing and Destabilizing Soil Organic Matter

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(18), P. 12136 - 12152

Published: Sept. 1, 2021

Manganese (Mn) is a biologically important and redox-active metal that may exert poorly recognized control on carbon (C) cycling in terrestrial ecosystems. influences ecosystem C dynamics by mediating biochemical pathways include photosynthesis, serving as reactive intermediate the breakdown of organic molecules, binding and/or oxidizing molecules through organo-mineral associations. However, potential for Mn to influence storage remains unresolved. Although substantial research has demonstrated ability Fe- Al-oxides stabilize matter, there scarcity similar information regarding Mn-oxides. Furthermore, Mn-mediated reactions regulate litter decomposition pathways, but these processes are constrained across diverse Here, we discuss ecological roles environments synthesize existing knowledge multiple which biogeochemical intersect. We demonstrate high degrade abiotic microbially mediated oxidation at least temporarily, outline priorities needed advance understanding Mn-C interactions, highlighting gaps address key uncertainties soil predictions.

Language: Английский

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Aerobic Denitrification Enhanced by Immobilized Slow-Released Iron/Activated Carbon Aquagel Treatment of Low C/N Micropolluted Water: Denitrification Performance, Denitrifying Bacterial Community Co-occurrence, and Implications

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(13), P. 5252 - 5263

Published: March 21, 2023

The key limiting factors in the treatment of low C/N micropolluted water bodies are deficient essential electron donors for nitrogen removal processes. An iron/activated carbon aquagel (IACA) was synthesized as a slowly released inorganic donor to enhance aerobic denitrification performance treatment. efficiency IACA reactors enhanced by more than 56.72% and highest 94.12% accomplished compared with those control reactors. Moreover, CODMn improved 34.32% Illumina MiSeq sequencing consequence explained that denitrifying bacteria facultative denitrification, iron oxidation, reduction function were located dominant species niches (e.g., Pseudomonas, Leptothrix, Comamonas). diversity richness bacterial communities Network analysis indicated consortia presented complicated co-occurrence structure. potential long-term operation. This study affords pathway utilize IACA, promoting during body

Language: Английский

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Reactive Oxygen Species Triggered Oxidative Degradation of Polystyrene in the Gut of Superworms (Zophobas atratus Larvae)

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(20), P. 7867 - 7874

Published: May 9, 2023

Oxidative decomposition of polystyrene (PS) by insects has been previously demonstrated, yet little is known about the oxidation mechanism and its effect on metabolism plastics within insect gut. Here, we demonstrate generation reactive oxygen species (ROS) in gut superworms (Zophobas atratus larvae) under different feeding trails, which turn induced oxidative ingested PS. The ROS were commonly generated larva gut, PS consumption resulted a significant increase with maximum ·OH 51.2 μmol/kg, was five times higher than bran group. Importantly, scavenging significantly decreased depolymerization PS, indicating vital role effective degradation superworms. Further investigation suggested that caused combinatorial extracellular oxidases microbes. These results extensively produced intestinal microenvironment larvae, greatly favored digestion bio-refractory polymers. This work provides new insights into underlying biochemical mechanisms plastic

Language: Английский

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Mineral-mediated stability of organic carbon in soil and relevant interaction mechanisms

Eco-Environment & Health, Journal Year: 2024, Volume and Issue: 3(1), P. 59 - 76

Published: Jan. 3, 2024

Soil, the largest terrestrial carbon reservoir, is central to climate change and relevant feedback environmental health. Minerals are essential components that contribute over 60% of soil storage. However, how interactions between minerals organic shape transformation stability remains poorly understood. Herein, we critically review primary mechanisms, including sorption, redox reaction, co-precipitation, dissolution, polymerization, catalytic reaction. These interactions, highly complex with combination multiple processes, greatly affect through following processes: (1) formation or deconstruction mineral-organic association; (2) oxidative minerals; (3) polymerization (4) varying association according mineral transformation. Several pieces evidence related turnover during interaction in real eco-environment then demonstrated. We also highlight current research gaps outline priorities, which may map future directions for a deeper mechanisms-based understanding storage capacity considering its minerals.

Language: Английский

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Active Iron Phases Regulate the Abiotic Transformation of Organic Carbon during Redox Fluctuation Cycles of Paddy Soil

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(20), P. 14281 - 14293

Published: Oct. 8, 2021

Iron (Fe) phases are tightly linked to the preservation rather than loss of organic carbon (OC) in soil; however, during redox fluctuations, OC may be lost due Fe phase-mediated abiotic processes. This study examined role driving hydroxyl radical (•OH) formation and transformation cycles paddy soils. Chemical probes, sequential extraction, Mössbauer analyses showed that active species, such as exchangeable surface-bound low-crystalline minerals (e.g., green rust-like phases), predominantly regulated •OH cycles. The oxidation strongly induced oxidative OC, which accounted for 15.1–30.8% CO2 production oxygenation. Microbial processes contributed 7.3–12.1% production, estimated by chemical quenching γ-irradiation experiments. After five cycles, 30.1–71.9% associated with species was released, whereas 5.2–7.1% stabilized high-crystalline irreversible these Collectively, our findings might unveil under-appreciated more conservation soil fluctuation events.

Language: Английский

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Bioenergetic control of soil carbon dynamics across depth

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Dec. 12, 2022

Soil carbon dynamics is strongly controlled by depth globally, with increasingly slow found at depth. The mechanistic basis remains however controversial, limiting our ability to predict cycle-climate feedbacks. Here we combine radiocarbon and thermal analyses long-term incubations in absence/presence of continuously 13C/14C-labelled plants show that bioenergetic constraints decomposers consistently drive the depth-dependency soil over a range mineral reactivity contexts. subsoil tightly related both its low energy density high activation decomposition, leading an unfavourable 'return-on-energy-investment' for decomposers. We also observe strong acceleration millennia-old decomposition induced roots ('rhizosphere priming'), showing sufficient supply able alleviate limitation decomposition. These findings demonstrate persistence results from poor quality together lack due their

Language: Английский

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Redox-induced transformation of potentially toxic elements with organic carbon in soil

Carbon Research, Journal Year: 2022, Volume and Issue: 1(1)

Published: June 29, 2022

Abstract Soil organic carbon (SOC) is a crucial component that significantly affects the soil fertility, remediation, and sequestration. Here, we review redox-induced transformation of potentially toxic elements (PTEs) through abiotic impact SOC. The complex composition SOC includes humus, pyrogenic (e.g., biochar), dissolved matter, anthropogenic compost), with varying concentrations properties. primary redox moieties on are surface functionalities phenol, quinone, N/S-containing functional groups), environmentally persistent free radicals, graphitic structures, their contents highly variable. Owing to these rich moieties, can directly affect reduction oxidation PTEs in soil, such as Cr(VI) As(III) oxidation. In addition, interactions between (i.e., O 2 , Fe, Mn minerals) cause PTEs. formation reactive oxygen species, Fe(II), Mn(III)/Mn(II) main contributor PTEs, including As(III)/Cr(III)/Tl(I) We articulated both positive negative effects which could guide remediation efforts. Further scientific studies necessary better understand potential transformations by SOC, considering complicated variable composition, biotic environment. Graphical

Language: Английский

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The nitrogen gap in soil health concepts and fertility measurements

Soil Biology and Biochemistry, Journal Year: 2022, Volume and Issue: 175, P. 108856 - 108856

Published: Oct. 21, 2022

Language: Английский

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Enzymatic activity and functional diversity of soil microorganisms along the soil profile – A matter of soil depth and soil-forming processes

Geoderma, Journal Year: 2022, Volume and Issue: 416, P. 115779 - 115779

Published: March 9, 2022

Language: Английский

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Nitrogen addition stimulates litter decomposition rate: From the perspective of the combined effect of soil environment and litter quality

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 179, P. 108992 - 108992

Published: Feb. 22, 2023

Language: Английский

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