Formation of soil organic carbon pool is regulated by the structure of dissolved organic matter and microbial carbon pump efficacy: A decadal study comparing different carbon management strategies

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(18), P. 5445 - 5459

Published: July 9, 2023

To achieve long-term increases in soil organic carbon (SOC) storage, it is essential to understand the effects of management strategies on SOC formation pathways, particularly through changes microbial necromass (MNC) and dissolved (DOC). Using a 14-year field study, we demonstrate that both biochar maize straw lifted ceiling, but different pathways. Biochar, while raising DOC content, decreased substrate degradability by increasing aromaticity. This resulted suppressed abundance enzyme activity, which lowered respiration, weakened vivo turnover ex modification for MNC production (i.e., low pump "efficacy"), led lower efficiency decomposing MNC, ultimately resulting net accumulation MNC. In contrast, incorporation increased content aromaticity DOC. The enhanced nutrient such as total nitrogen phosphorous, stimulated population thereby boosting respiration enhancing "efficacy" production. C added plots were estimated 27.3-54.5 41.4 Mg ha-1 , respectively. Our results demonstrated was more efficient lifting stock via exogenous stable input stabilization, although latter showed "efficacy". Meanwhile, significantly promoted also mineralization, smaller increase (by 50%) compared 53%-102%). address decadal-scale application pool soil, understanding causal mechanisms can allow practices maximize content.

Language: Английский

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Soil organic matter dynamics mediated by arbuscular mycorrhizal fungi – an updated conceptual framework

New Phytologist, Journal Year: 2023, Volume and Issue: 242(4), P. 1417 - 1425

Published: Aug. 2, 2023

Summary Arbuscular mycorrhizal (AM) fungi play an important role in soil organic matter (SOM) formation and stabilization. Previous studies have emphasized compounds produced by AM as persistent binding agents for aggregate SOM storage. This concept overlooks the multiple biogeochemical processes mediated fungal activities, which drive generation, reprocessing, reorganization, Here, we propose updated conceptual framework to facilitate a mechanistic understanding of dynamics. In this framework, four pathways fungi‐mediated dynamics are included: ‘Generating’, exudates biomass serve key sources chemodiversity; ‘Reprocessing’, hyphosphere microorganisms decomposition resynthesis; ‘Reorganizing’, mediate physical changes influence transport, redistribution, transformation, storage; ‘Stabilizing’, mineral weathering organo–mineral interactions Moreover, discuss at different scales, especially when translating results from small scales complex larger scales. We believe that working with can allow better dynamics, therefore facilitating development mycorrhiza‐based technologies toward health global change mitigation.

Language: Английский

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Integrating microbial community properties, biomass and necromass to predict cropland soil organic carbon

ISME Communications, Journal Year: 2023, Volume and Issue: 3(1)

Published: Aug. 23, 2023

Manipulating microorganisms to increase soil organic carbon (SOC) in croplands remains a challenge. Soil microbes are important drivers of SOC sequestration, especially via their necromass accumulation. However, microbial parameters rarely used predict cropland stocks, possibly due uncertainties regarding the relationships between pools, community properties and SOC. Herein we evaluated (diversity network complexity), pools (biomass carbon) 468 soils across northeast China. We found that not only but also complexity) biomass were correlated with Microbial diversity played more role predicting for maize, while complexity was rice. Models performed better when included simultaneously. Taken together our results suggest influence accumulation croplands, management practices improve these may levels.

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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Reducing the uncertainty in estimating soil microbial-derived carbon storage

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(35)

Published: Aug. 22, 2024

Soil organic carbon (SOC) is the largest pool in terrestrial ecosystems and plays a crucial role mitigating climate change enhancing soil productivity. Microbial-derived (MDC) main component of persistent SOC pool. However, current formulas used to estimate proportional contribution MDC are plagued by uncertainties due limited sample sizes neglect bacterial group composition effects. Here, we compiled comprehensive global dataset employed machine learning approaches refine our quantitative understanding contributions total storage. Our efforts resulted reduction relative standard errors prevailing estimations an average 71% minimized effect variations compositions on estimating MDC. estimation indicates that contributes approximately 758 Pg, representing 40% stock. study updated with improving accuracy preserving simplicity practicality. Given unique biochemistry functioning pool, has direct implications for modeling predicting land–atmosphere balance under future scenarios.

Language: Английский

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Effects of microplastics on soil carbon pool and terrestrial plant performance

Carbon Research, Journal Year: 2024, Volume and Issue: 3(1)

Published: April 19, 2024

Abstract Soil, as a primary repository of plastic debris, faces an escalating influx microplastics. Microplastics have the potential to decrease soil bulk density and pH, well alter pore structure aggregation. These changes in physicochemical properties subsequently lead habitat degradation for microbes environmental shifts that impact plant growth. Masquerading carbon storage, microplastics can distort assessments pool by introducing plastic-carbon associated leachates, influencing organic matter (SOM) turnover through priming effects (e.g., dilution, substrate switching, co-metabolisms). Additionally, influence distribution particulate mineral-associated matter, consequently affecting accumulation stability carbon. Furthermore, also chemodiversity dissolved (DOM) soils increasing DOM aromaticity molecular weight while deepening its humification degree. The observed may be attributed inputs from microplastic-derived along with organo-organic organo-mineral interactions coupled microbial processes. Acting inert source carbon, create distinct ecological niche growth contribute necromass formation pathways. Conventional reduce contribution stable whereas bio-microplastics tend increase it. exert wide range on performance both internal external factors, seed germination, vegetative reproductive growth, inducing ecotoxicity genotoxicity. impacts arise alterations environment or uptake plants. Future research should aim elucidate storage within fractions, paying closer attention rhizosphere dynamics such stabilization mineral protection rhizodeposits soils. Graphical

Language: Английский

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The contribution of microbial necromass to soil organic carbon and influencing factors along a variation of habitats in alpine ecosystems

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 921, P. 171126 - 171126

Published: Feb. 21, 2024

Language: Английский

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Emerging multiscale insights on microbial carbon use efficiency in the land carbon cycle

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

Published: Sept. 13, 2024

Microbial carbon use efficiency (CUE) affects the fate and storage of in terrestrial ecosystems, but its global importance remains uncertain. Accurately modeling predicting CUE on a scale is challenging due to inconsistencies measurement techniques complex interactions climatic, edaphic, biological factors across scales. The link between microbial soil organic relies stabilization necromass within aggregates or association with minerals, necessitating an integration processes approaches. In this perspective, we propose comprehensive framework that integrates diverse data sources, ranging from genomic information traditional assessments, refine cycle models by incorporating variations CUE, thereby enhancing our understanding contribution cycling.

Language: Английский

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Bottom-up perspective – The role of roots and rhizosphere in climate change adaptation and mitigation in agroecosystems

Plant and Soil, Journal Year: 2024, Volume and Issue: 500(1-2), P. 297 - 323

Published: April 4, 2024

Abstract Background and Aims Climate change is happening causing severe impact on the sustainability of agroecosystems. We argue that many abiotic stresses associated with climate will be most acutely perceived by plant at root-soil interface are likely to mitigated this globally important interface. In review we focus direct impacts change, temperature, drought pCO 2 , roots rhizospheres. Methods Results consider which belowground traits impacted discuss potential for monitoring quantifying these modelling breeding programs. specific combined stress role microbial communities populating interface, collectively referred as rhizosphere microbiota, in interactions under plastic responses a way adapting plants change. then go has understanding complex problem suggest best targets adaptation mitigation finish considering where main uncertainties lie, providing perspective research needed. Conclusion This therefore focuses adapt effects mitigate their negative growth, crop productivity, soil health ecosystem services.

Language: Английский

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The functional role of arbuscular mycorrhizal fungi in enhancing soil organic carbon stocks and stability in dryland

Soil and Tillage Research, Journal Year: 2025, Volume and Issue: 248, P. 106443 - 106443

Published: Jan. 2, 2025

Language: Английский

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