An evolving view on biogeochemical cycling of iron

Nature Reviews Microbiology, Journal Year: 2021, Volume and Issue: 19(6), P. 360 - 374

Published: Feb. 1, 2021

Language: Английский

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Global distribution, formation and fate of mineral‐associated soil organic matter under a changing climate: A trait‐based perspective

Functional Ecology, Journal Year: 2022, Volume and Issue: 36(6), P. 1411 - 1429

Published: March 7, 2022

Abstract Soil organic matter (SOM) is the largest actively cycling reservoir of terrestrial carbon (C), and majority SOM in Earth's mineral soils (~65%) mineral‐associated (MAOM). Thus, formation fate MAOM can exert substantial influence on global C cycle. To predict future changes to climate, it critical mechanistically understand processes by which formed decomposed, accurately represent this process‐based understanding biogeochemical Earth system models. In review, we use a trait‐based framework synthesize interacting roles plants, soil micro‐organisms, matrix regulating decomposition. Our proposed differentiates between plant microbial traits that total OM inputs (‘feedstock traits’) versus proportion are ultimately incorporated into (‘MAOM traits’). We discuss how these feedstock may be altered warming, precipitation elevated dioxide. At planetary scale, help shape distribution across biomes, modulate biome‐specific responses climate change. leverage synthesis measurements provide estimates amount MAOM‐C globally (~840–1540 Pg C; 34%–51% C), its biomes. show concentration highest temperate forests grasslands, lowest shrublands savannas. Grasslands croplands have (SOC) fraction (i.e. MAOM‐C:SOC ratio), while boreal tundra ratio. Drawing our trait framework, then review experimental data posit effects change pools different conclude discussing integrated models, included also summarize projected under scenarios (Representative Concentration Pathways 4.5 8.5) key model uncertainties. Read free Plain Language Summary for article Journal blog.

Language: Английский

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Mechanisms of soil organic carbon stability and its response to no‐till: A global synthesis and perspective

Global Change Biology, Journal Year: 2021, Volume and Issue: 28(3), P. 693 - 710

Published: Nov. 2, 2021

Mechanisms of soil organic carbon (SOC) stabilization have been widely studied due to their relevance in the global cycle. No-till (NT) has frequently adopted sequester SOC; however, limited information is available regarding whether sequestered SOC will be stabilized for long term. Thus, we reviewed mechanisms affecting stability NT systems, including priming effects (PE), molecular structure SOC, aggregate protection, association with minerals, microbial properties, and environmental effects. Although a more steady-state observed compared conventional tillage (CT), may depend on physical chemical protection. On average, improves macro-aggregation by 32.7%, lowers mineralization macro-aggregates CT. Chemical protection also important direct adsorption molecules enhancement aggregation minerals. Higher activity could produce binding agents promote formation metal-oxidant complexes. residues soils over term through attachment mineral surfaces entrapment aggregates under NT. reduces 18.8% PE intensities after fresh inputs 21.0% CT (p < .05). higher temperature sensitivity (Q10 ) greater Q10 macro-aggregates, an increase moisture regime potentially constrain improvement . This review process-based understanding mechanism that can act, independently or interactively, enhance preservation. It concluded systems likely

Language: Английский

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Coupled iron cycling and organic matter transformation across redox interfaces

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(9), P. 659 - 673

Published: Aug. 24, 2023

Language: Английский

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Soil Organic Matter Characterization by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR MS): A Critical Review of Sample Preparation, Analysis, and Data Interpretation

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(14), P. 9637 - 9656

Published: July 7, 2021

The biogeochemical cycling of soil organic matter (SOM) plays a central role in regulating health, water quality, carbon storage, and greenhouse gas emissions. Thus, many studies have been conducted to reveal how anthropogenic climate variables affect sequestration nutrient cycling. Among the analytical techniques used better understand speciation transformation SOM, Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS) is only technique that has sufficient resolving power separate accurately assign elemental compositions individual SOM molecules. global increase application FTICR MS address complexity highlighted challenges opportunities associated with sample preparation, analysis, spectral interpretation. Here, we provide critical review recent strategies for characterization by emphasis on collection, data Data processing visualization methods are presented suggested workflows detail considerations needed molecular information derived from MS. Finally, highlight current research gaps, biases, future directions improve our understanding chemistry within terrestrial ecosystems.

Language: Английский

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Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

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

Published: Aug. 29, 2022

Permafrost thaw can stimulate microbial decomposition and induce soil carbon (C) loss, potentially triggering a positive C-climate feedback. However, earlier observations have concentrated on bulk C dynamics upon permafrost thaw, with limited evidence involving fractions. Here, we explore how the functionally distinct fractions, including particulate mineral-associated organic (POC MAOC) as well iron-bound (OC-Fe), respond to using systematic measurements derived from one sequence five additional thermokarst-impacted sites Tibetan Plateau. We find that topsoil POC content substantially decreases, while MAOC remains stable OC-Fe accumulates due enriched Fe oxides after thaw. Moreover, proportion of increases along at most sites. The relatively fractions would alleviate weaken its feedback climate warming over long-term thermokarst development.

Language: Английский

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Mechanisms and implications of bacterial–fungal competition for soil resources

The ISME Journal, Journal Year: 2024, Volume and Issue: 18(1)

Published: Jan. 1, 2024

Abstract Elucidating complex interactions between bacteria and fungi that determine microbial community structure, composition, functions in soil, as well regulate carbon (C) nutrient fluxes, is crucial to understand biogeochemical cycles. Among the various interactions, competition for resources main factor determining adaptation niche differentiation these two big groups soil. This because C energy limitations growth are a rule rather than an exception. Here, we review demands of fungi—the major kingdoms soil—the mechanisms their other resources, leading differentiation, global change impacts on this competition. The normalized utilization preference showed 1.4–5 times more efficient uptake simple organic compounds substrates, whereas 1.1–4.1 effective utilizing compounds. Accordingly, strongly outcompete while take advantage Bacteria also compete with products released during degradation substrates. Based specifics, differentiated spatial, temporal, chemical niches will increase under five changes including elevated CO2, N deposition, soil acidification, warming, drought. Elevated warming bacterial dominance, acidification drought fungal competitiveness.

Language: Английский

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Tide-Triggered Production of Reactive Oxygen Species in Coastal Soils

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(16), P. 11888 - 11896

Published: July 11, 2022

We report an unrecognized, tidal source of reactive oxygen species (ROS). Using a newly developed ROS-trapping gel film, we observed hot spots for ROS generation within ∼2.5 mm coastal surface soil. Kinetic analyses showed rapid production hydroxyl radicals (•OH), superoxide (O2•–), and hydrogen peroxide (H2O2) upon shift from high tide to low tide. The exhibited distinct rhythmic fluctuation. oscillations the redox potential dissolved concentration followed same pattern as •OH production, suggesting alternating oxic–anoxic conditions main geochemical drive production. Nationwide field investigations confirmed widespread sustainable via processes (22.1–117.4 μmol/m2/day), which was 5- 36-fold more efficient than those classical photochemical routes (1.5–7.6 μmol/m2/day). Analyses soil physicochemical properties demonstrated that redox-metastable components such redox-active iron minerals organic matter played key role in storing electrons at shuttling infiltrated Our work sheds light on ubiquitous but previously overlooked ROS, may accelerate carbon metal cycles well pollutant degradation soils.

Language: Английский

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Dominance of particulate organic carbon in top mineral soils in cold regions

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(2), P. 145 - 150

Published: Jan. 4, 2024

Language: Английский

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Organo–organic interactions dominantly drive soil organic carbon accrual

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(1)

Published: Jan. 1, 2024

Abstract Organo–mineral interactions have been regarded as the primary mechanism for stabilization of soil organic carbon (SOC) over decadal to millennial timescales, and capacity (C) storage has commonly assessed based on mineralogical attributes, particularly mineral surface availability. However, it remains contentious whether C sequestration is exclusively governed by vacancies, making challenging accurately predict SOC dynamics. Here, through a 400‐day incubation experiment using 13 C‐labeled materials in two contrasting soils (i.e., Mollisol Ultisol), we show that despite unsaturation surfaces both soils, newly incorporated predominantly adheres “dirty” coated with native matter (OM), demonstrating crucial role organo–organic exogenous sequestration. Such lead multilayered accumulation not constrained process distinct from direct organo–mineral contacts. The coverage OM new C, representing degree interactions, noticeably larger Ultisol (~14.2%) than (~5.8%), amounting net retention 0.2–1.3 g kg −1 0.1–1.0 . Additionally, are primarily mediated polysaccharide‐rich microbial necromass. Further evidence indicates iron oxides can selectively preserve polysaccharide compounds, thereby promoting interactions. Overall, our findings provide empirical an overlooked but critically important pathway accumulation, prevailing “C saturation” concept emphasizes overriding vacancies. It estimated that, global Mollisols Ultisols might sequester ~0.1–1.0 ~0.3–1.7 Pg per year, respectively, corresponding neutralization ca. 0.5%–3.0% emissions or 5%–30% fossil fuel combustion globally.

Language: Английский

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