Enhanced Mineral Preservation Rather Than Microbial Residue Production Dictates the Accrual of Mineral‐Associated Organic Carbon Along a Weathering Gradient

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(6)

Published: March 18, 2024

Abstract Mineral preservation and microbial residue production are vital for the accumulation of mineral‐associated organic carbon (MAOC) in soils. However, their relative importance interactive effects remain unclear. Here MAOC content composition analyzed tandem with soil mineral attributes along a weathering gradient on volcanic sequence. We find that increases increasing states, accompanied by contribution to MAOC. rather than physiological traits strongly related contents, suggesting weathering‐enhanced capacity overrides governing reactive minerals. Furthermore, have strong effect composition, likely fungal abundance community weathering. These findings highlight may effectively boost persistent SOC synergy conversion long term.

Language: Английский

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Enhanced microbial contribution to mineral-associated organic carbon accrual in drained wetlands: Beyond direct lignin-iron interactions

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 185, P. 109152 - 109152

Published: Aug. 18, 2023

Language: Английский

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Does microbial carbon use efficiency differ between particulate and mineral‐associated organic matter?

Functional Ecology, Journal Year: 2024, Volume and Issue: 38(7), P. 1510 - 1522

Published: April 29, 2024

Abstract Microbial carbon use efficiency (CUE), a key parameter to characterize microbial conversion efficiency, is assumed be similar in soil models for different functional pools with varied organic matter composition and nutrient availability, that is, particulate (POM) mineral‐associated (MAOM). However, empirical studies comparing CUE POM versus MAOM are largely lacking. It not known whether variance may underpin the variant behaviour (i.e. turnover composition) of pools. Here we collected surface soils from 25 natural forests grasslands divergent edaphic properties, compared their using fractionation combination incubation 18 O‐labelled water. We also quantified composition, community structures stoichiometric imbalance nitrogen (N) phosphorus (P) relative based on dissolved pool biomass (Im N Im P ) investigate variables regulating its variation (CUE /CUE ). In contrast our expectation, did consistently differ between across sites, albeit large inter‐sample variations (from 0.3 4.4). Although had higher substrate quality, indicated by lower ratios total (C/N OM N‐compounds/aromatic ratios, proportions r‐strategists fast‐growing bacteria than POM, degrees limitation ), which was best predictor all samples. Therefore, although harboured more N‐containing compounds necessarily lower, leading an overall MAOM. Nevertheless, decreased increasing Overall, paper presents comprehensive, study diverse soils, results support models, but highlight potential contrasts under strong limitation. Such inferences deserve attention potentially induced deposition. This advances mechanistic understanding ecological patterns processes organismic ecosystem scale physiology Read free Plain Language Summary this article Journal blog.

Language: Английский

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Divergent chemical compositions of soil organic matter size fractions under long-term amendments across a climate gradient

Soil and Tillage Research, Journal Year: 2024, Volume and Issue: 242, P. 106156 - 106156

Published: May 14, 2024

Language: Английский

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Impact of drainage on peatland soil environments and greenhouse gas emissions in Northeast China

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: March 10, 2025

Peatlands are vital for global carbon storage, but drainage significantly disrupts their natural cycling. Drainage alters peatland soil environments in complex ways, affecting factors such as water table, temperature, organic (SOC), pH, and microbial communities. However, how these interact to influence GHG emissions remains unclear. In this study, we compared properties, community structure, across three zones of a Northeast China undergoing drainage: drained, transition, areas. The average table the drained area was lower than (from 11.45 cm -13.47 cm), shifting from waterlogged unsaturated conditions. Deep temperatures decreased by 1 ~ 3 °C. pH upper layer higher (5.05 5.29 vs. 4.64 4.71), while SOC (197.31 374.75 g/kg 437.05 512.71 g/kg). Aerobic bacteria (mainly Solibacter) were more abundant area, methanogens hydrogenotrophic) declined significantly. Fungal diversity increased with negative interactions enhanced network modularity. reduced CH4 CO2 N2O emissions, resulting significant rise net (8.86 10.65 22.27 24.26 t CO2-eq·ha⁻¹·season⁻¹), primarily driven CO2. positively correlated aerobic bacteria, facultatively anaerobic negatively moisture C/N ratio. flux pH. effects pronounced near ditches, particularly highlighting localized impacts on fluxes.

Language: Английский

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Iron‐Driven Fast Decomposition of Soil Carbon Under Periodic Anoxia

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(4)

Published: April 1, 2025

Soil organic carbon (SOC) decomposition underpins soil-atmosphere exchange and is regulated by climate change-mediated variations in soil redox conditions. Periodic anoxia, commonly occurring following precipitation, flooding, erosion events, assumed to preserve SOC. Yet, water saturation may also increase SOC relative unsaturated conditions, contradictory findings among previous studies remain unexplained. Here, using incubation experiments on 20 soils collected across a 24° latitude gradient China, we show that 70% of the showed higher or similar anoxic rate compared oxic treatment, indicating fast loss under relatively short anoxia. Methane production was far lower than CO2 due presence alternative terminal electron acceptors (TEAs). Variation TEAs microbial community shows primarily driven iron (Fe) reduction, which accounted for up 90% production. Meanwhile, positive relationships water-extractable (OC), hydrochloric acid-extractable ferrous Fe, abundance Fe-reducing prokaryotes, suggest release readily metabolized substrates Fe reduction. This provided metabolism potentially led OC protected (Fe-bound OC; slow-cycling pool conditions). Mass balance calculation confirms Fe-bound mostly elevated magnitude, random forest modeling indicates rich reducible SOC, prokaryotes most likely experience periodic Overall, our demonstrate important pathway stimulate intense hydrologic regimes, particularly

Language: Английский

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Salix species and varieties affect the molecular composition and diversity of soil organic matter

Plant and Soil, Journal Year: 2024, Volume and Issue: unknown

Published: July 5, 2024

Abstract Background and aims Most studies of the relationships between composition soil organic matter plant cover have been carried out at genera level. However, they largely overlooked potential effects that varieties, belonging to same genus, can on matter. Methods We investigated whether varieties different Salix species ( S. dasyclados viminalis) impacted using mid-infrared spectroscopy pyrolysis GC/MS. Top-soils were taken from an 18 year-old long-term field trial where six grown as short-rotation coppice under two fertilisation regimes. Results Significant differences in molecular diversity observed fertilised plots. The mostly visible level, i.e. had higher lignin content than viminalis , potentially due amount their litter inputs. Smaller among also observed. No significant unfertilised relatively high degree spatial variability several properties found these plots may masked variety and/or effects. Conclusion This study provides evidence identity or affect corresponding traits should be considered breeding programmes enhance C accumulation persistence.

Language: Английский

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Disturbance alters soil organic carbon content and stability in Carex tussock wetland, Northeast China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 175417 - 175417

Published: Aug. 15, 2024

Language: Английский

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Variation of soil organic carbon stability in restored mountain marsh wetlands

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Oct. 10, 2024

The replacement of farmland by native hygro-plants is increasingly common globally within the context wetland ecosystem restoration. Understanding long-term effects this on abundance and persistence soil organic carbon (SOC) in mountain marshes important for management. Here, restored plateau Duliu River Wetland Provincial Nature Reserve, China was selected. properties, moisture content (SMC), pH, texture, free-form iron oxides ( $$\:{\text{F}\text{e}}_{\text{d}}$$ ), amorphous $$\:{\text{F}\text{e}}_{\text{o}}$$ mineral-associated (MAOC), iron-bound (Fe-OC) were analyzed topsoil samples (0 ~ 20 cm) during restoration rice paddies to Sphagnum palustre L. wetlands 0, 2, 10, years. Natural also used as control. We found that marsh increased SMC, , / SOC, MAOC, Fe-OC, Fe-OC/SOC, but decreased MAOC/SOC ratio. ratio expectedly lower than proportion labile SOC total period. MAOC higher natural other habitats. Both Fe-OC/SOC positively correlated with negatively pH. . These results emphasized significance reconverting increasing sequestration Fe-OC. Further studies are required identify quantify organo-mineral stabilization mechanisms at different fractionations throughout

Language: Английский

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Reclamation leads to loss of soil organic carbon and molecular complexity: Evidence from natural to reclaimed wetlands

Soil and Tillage Research, Journal Year: 2024, Volume and Issue: 248, P. 106436 - 106436

Published: Dec. 20, 2024

Language: Английский

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