Biogeochemistry, Journal Year: 2022, Volume and Issue: 157(3), P. 355 - 378
Published: Jan. 17, 2022
Language: Английский
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
Citations
27
Geophysical Research Letters, Journal Year: 2021, Volume and Issue: 48(10)
Published: May 4, 2021
Abstract Metal‐bound organic carbon (OC) is vital for the persistence of soil (SOC). However, its relative importance in different land types (e.g., upland vs. wetland) remains unclear. Here by analyzing metal‐bound OC classic citrate‐bicarbonate‐dithionite method (OC CBD ) from 62 soils contrasting environments, we find that constitutes an equally important proportion SOC %) wetlands as uplands. Land‐use type and calcium (Ca) content are best predictors %, likely owing to contribution directly associated with sulfate‐extractable Ca Na2SO4 Ca's bridging aggregating effect on . By further separating , accounts ∼24% Tibetan‐Mongolian grasslands shift S‐shaped mode along pH gradient (6–9). These findings highlight distribution at regional scales.
Language: Английский
Citations
66
The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 855, P. 158710 - 158710
Published: Sept. 11, 2022
Iron (Fe) oxides are widely recognized to prevent the degradation of organic matter (OM) in environments, thereby promoting persistence carbon (OC) soils. Thus, discerning association mechanisms Fe and OC interactions is key effectively influencing dynamics extent C cycling Previous studies have focused on i) quantifying oxide-bound (Fe-OC) individual ii) investigating distribution adsorption capacity Fe-OC, iii) assessing redox transformation Fe-OC. Furthermore, widespread application high-tech instrumentation methods has greatly contributed a better understanding mechanism mineral assemblages past few decades. However, literature reviews comprehensively summarized Fe-OC distributions, associations, characteristics soil-plant systems. Here, contents among different environments reviewed. In addition, processes related OM occurring at mineral-organic interfaces also described. Recent highlighted that diverse occur between OC, with compounds adhering due their huge specific surfaces area active reaction sites. Moreover, we review for micro-interfaces. Lastly, developmental prospects coupled geochemical soil molecular- nano-scales outlined. The summary suggests combined advanced techniques should be used future research explore micro-interfaces situ descriptions assemblages. This need consider functional spatial complexity typical soil/sediment where occur.
Language: Английский
Citations
64
Global Biogeochemical Cycles, Journal Year: 2022, Volume and Issue: 36(1)
Published: Jan. 1, 2022
Abstract Association of organic carbon (C) with iron (Fe) minerals is one important mechanism for long‐term terrestrial C storage. Yet, specific edaphic variables that directly contribute to Fe‐associated across diverse soil types are still unclear. Through analyzing soils from the National Ecological Observatory Network (NEON) and other published data, here we show pH primarily controls globe. in most ranged 0 20 g kg −1 soil, a strong increase 4.2 3.5, but small change > 4.2. A microcosm experiment further showed raising by liming reduced formation an acidic Oxisol. Together, these findings demonstrate dominant role controlling abundance C.
Language: Английский
Citations
56
Global Change Biology, Journal Year: 2022, Volume and Issue: 28(22), P. 6711 - 6727
Published: Aug. 5, 2022
Paddies contain 78% higher organic carbon (C) stocks than adjacent upland soils, and iron (Fe) plaque formation on rice roots is one of the mechanisms that traps C. The process sequence, extent global relevance this C stabilization mechanism under oxic/anoxic conditions remains unclear. We quantified localized contribution Fe to matter in a microoxic area (rice rhizosphere) evaluated roles trap for sequestration paddy soils. Visualization localization pH by imaging with planar optodes, enzyme activities zymography, root exudation 14 imaging, as well upscale modeling enabled linkage three groups rhizosphere processes are responsible from micro- (root) macro- (ecosystem) levels. activity soil (reflecting rhizodeposits) Fe2+ addition was 1.4-1.5 times control phosphate Perfect co-localization hotspots β-glucosidase (by zymography) (14 C) showed labile high were within plaques. its microbial oxidation Fe3+ radial oxygen release increased (Fe3+ ) 1.7-2.5 times. amounts trapped 1.1 after addition. Therefore, formed amorphous complex (oxyhydr)oxides surface act "rusty sink" matter. Considering coverage soils globally, upscaling model revealed loss bacterial may up 130 Mg plaques per season. This represents an important annual surplus new stable existing pool long-term cropping.
Language: Английский
Citations
42
Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 179, P. 108972 - 108972
Published: Feb. 4, 2023
Language: Английский
Citations
26
National Science Review, Journal Year: 2024, Volume and Issue: 11(11)
Published: May 20, 2024
ABSTRACT The established paradigm assumes that drainage may decrease the vast soil organic carbon (SOC) reservoir in global wetlands. Yet can also promote SOC stabilization by fostering accrual of metal-bound (bound OC) upon oxygen exposure. Here, this emergent mechanism is tested for first time at a regional scale, using literature data and nationwide, pairwise survey drained wetlands across China. We show long-term (15–55 years) largely increased metallic protection OC%) non-Sphagnum wetlands, but consistently decreased bound OC% Sphagnum following replacement ‘rust engineer’ herbaceous plants. Improved stock estimates based on 66 profiles reveal OC increases compensate loss unbound components with substantial reactive metals. Metallic wetland hence widespread overlooked heavily influenced vegetational shifts. Incorporating novel into models will improve prediction dynamics under shifting hydrological regimes.
Language: Английский
Citations
10
Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 2, 2025
Peatlands store one-third of the world's soil organic carbon. Globally increased fires altered peat matter chemistry, yet redox property and molecular dynamics peat-dissolved (PDOM) during remain poorly characterized, limiting our understanding postfire biogeochemical processes. Clarifying these dynamic changes is essential for effective peatland fire management. This study demonstrates temperature-dependent in electron exchange capacity (EEC) PDOM by simulating burning, significantly affecting microbial iron reduction. At low temperatures (200-250 °C), EEC remains constant releasing more phenolic moieties to enhance electron-donating (EDC). Higher (500 °C) diminish 90% consuming phenolic-quinone moieties. Pyrolytic (pyPDOM) contributes 40% soil, with this contribution declining at higher temperatures. Phenolic-quinone primary redox-active pyPDOM. Fourier transform ion cyclotron resonance mass spectrometry analysis shows that EDC depends on types than abundance, monophenol-like molecules (
Language: Английский
Citations
1
Global Biogeochemical Cycles, Journal Year: 2022, Volume and Issue: 36(11)
Published: Nov. 1, 2022
Abstract Preservation of organic carbon (OC) in marine and terrestrial deposits is enhanced by bonding with reactive iron (Fe R ). Association OC Fe (OC‐Fe ) provides physical protection hinders microbiological degradation. Roughly 20% all stored unconsolidated sediments 40% present Quaternary preserved as OC‐Fe , but this value varies from 10% to 80% across global depositional environments. Here, we provide a new assessment burial rates both environments, using published estimates associated burial, probabilistic modeling. We estimate the sink between 31 70 Mt C yr −1 (average 52 ), at 146 917 446 In continental shelves 17 deltaic/estuarine environments 11 Mg are primary settings burial. On land, croplands (279 grasslands (121 dominate budget. Changes Earth system through geological time impact pools, particularly settings. For example, periods intense explosive volcanism may lead increased net sediments. Our work highlights importance demonstrates how be an order magnitude greater here stocks most sensitive anthropogenic impacts climatic change.
Language: Английский
Citations
35
Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 185, P. 109152 - 109152
Published: Aug. 18, 2023
Language: Английский
Citations
20