Intercontinental correlation of organic carbon and …
The stable carbon isotope composition of bulk organic matter is affected by changes in the terrestrial contribution to the total organic carbon (TOC) (Kuypers et al., 2004): Cretaceous marine organic matter typically yields δ 13 C values that are lower by 3 to 4‰ compared to coeval land plant or terrestrial organic C, so changing ratios of ...
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(PDF) Wollastonite addition stimulates soil organic carbon
PDF | On May 1, 2023, Yongxue Yan and others published Wollastonite addition stimulates soil organic carbon mineralization: Evidences from 12 land-use types in subtropical China | Find, read and ...
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Contribution of deep-sourced carbon from hydrocarbon seeps …
In this study, we analyzed the carbon content, carbon stable isotopes, and radiocarbon isotopes from authigenic carbonates, the organic matter encapsulated within the carbonates and seafloor biota from hydrocarbon-seep provinces in the northern GoM and SCS (Fig. 1 and Table 1).Authigenic carbonates from the northern GoM were …
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Effect of cropping practices on soil organic carbon: evidence …
Despite considerable research, predicting how soil organic carbon (SOC) in grain production systems will respond to conservation management practices, such as reduced tillage, residue retention and alternative rotations, remains difficult because of the slowness of change and apparent site specificity of the effects. We compared SOC …
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Soil organic carbon turnover recovers faster than plant …
Soil organic carbon (SOC) turnover is a key parameter in the terrestrial ecosystem model and ecosystem management (Tan et al., 2020), and SOC pool is the largest terrestrial C reservoir (Amundson, 2001). Thus, the changes in SOC turnover caused by decreased N deposition might significantly affect global C cycle and further …
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Contribution of deep-sourced carbon from hydrocarbon …
Sulfate-driven anaerobic oxidation of methane (AOM) limits the release of methane from marine sediments and promotes the formation of carbonates close to the seafloor in seepage areas along continental margins. It has been established that hydrocarbon seeps are a source of methane, dissolved inorganic carbon, and dissolved …
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New evidence for preservation of contemporary marine organic carbon …
Organic carbon sequestration in marine sediments is a major control on atmospheric CO 2 and O 2 concentrations over geological time (Berner 2003), while being a poorly constrained pathway of contemporary carbon burial (Regnier et al 2022).The majority (approximately 90%) of organic carbon deposited at the global seafloor is …
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Lime and/or Phosphate Application Affects the Stability of Soil Organic …
The mechanisms by which lime and/or phosphate addition impacts the preservation of soil organic matter (OM) are poorly understood. We explored the changes in quantity and chemistry of water-extractable organic matter (WEOM) in the bulk soil and its heavy density fraction (>1.6 g/cm 3) of an unmanaged C-rich volcanic soil caused by …
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Contribution of deep-sourced carbon from hydrocarbon …
Sulfate-driven anaerobic oxidation of methane (AOM) limits the release of methane from marine sediments and promotes the formation of carbonates close to the seafloor in seepage areas along continental margins.It has been established that hydrocarbon seeps are a source of methane, dissolved inorganic carbon, and dissolved …
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Heavy thinning reduces soil organic carbon: Evidence from …
Soil dissolved organic carbon increased from 257.41 mg kg −1 in the control to 354.26 mg kg −1 in the moderate thinning (MT) (Fig. 1b). Thinning also significantly promoted microbial biomass carbon from 172.62 mg kg −1 in the control to 247.40 mg kg −1 in MT (P < 0.05; Fig. 1c). Compared to the control, HT significantly reduced soil ...
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Evidence for large microbial-mediated losses of soil carbon …
The top two metres of soils store more than 2,200–2,500 Pg of organic carbon (C) 1,2, representing the largest biologically active C pool in terrestrial ecosystems 3.The size of this C reservoir ...
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Petrological evidence for deep subduction of organic …
Our study. δ. provides the petrological evidence for the subduction of surface-derived organic carbon to the mantle depths of approximately 90 km, with the formation of graphitized organic carbon ...
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Higher temperature sensitivity for stable than for labile soil organic …
The impact of climate change on the stability of soil organic carbon (SOC) remains a major source of uncertainty in predicting future changes in atmospheric CO 2 levels. One unsettled issue is whether the mineralization response to temperature depends on SOC mineralization rate. Long-term (>25 years) bare fallow experiments (LTBF) in …
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Contribution of deep-sourced carbon from hydrocarbon …
Extremely low δ¹³C values of total inorganic carbon and organic carbon, increased Methane Index, and molybdenum (Mo) and uranium (U) enrichments at depths of 225–255 cm below the sea-floor ...
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A global meta-analysis of soil organic carbon in the …
Soil organic matter (SOM), mainly composed of carbon, is a critical component of soils 1. It plays a major role in regulating soil health 2, 3 and other ecosystem services such as biodiversity ...
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Fate of Subducting Organic Carbon: Evidence from Western …
Despite the size of the potentially deeply subducted organic C reservoir, its fate in subducting sections remains largely unexplored, with most attention paid to release of carbonate C.To characterize the forearc behavior of organic C, metamorphosed to pressures and temperatures as high as 3.0 GPa and 600˚C, reduced C concentrations …
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Post-farming land restoration schemes exhibit higher soil …
The soil organic carbon stocks were calculated using the following equations (Deng et al., 2016): (4) S O C S t o c k = S O C × B D × T 10 where SOC Stock represents soil organic carbon stocks (Mg∙ha −1), SOC represents the soil organic carbon content (g∙kg −1), BD represents the soil bulk density (g∙cm −3), and T …
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Direct evidence for organic carbon preservation as clay-organic …
The Woodford Shale core recovery is 41 m thick in the Wyche core, 11 m thick in the East Fitts core and 15 m thick in the Chitwood–Harris core (Fig. 1), and is primarily composed of organic rich shale (Fig. 2 f) with intermittent chert intervals (1–10 cm thick) as well as more silty intervals.All sediments lack evidence of storm-wave reworking …
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Soil organic carbon dynamics following natural …
1. Introduction. Globally, soil contains 1500–2300 Pg of organic carbon (OC), approximately twice as much as the amount in the atmosphere and three times the …
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Wollastonite addition stimulates soil organic carbon …
Wollastonite addition stimulates soil organic carbon mineralization: Evidences from 12 land-use types in subtropical China. Author links open overlay panel Yongxue Yan a b d 1, Xiaohan Dong a b d 1, Renshan Li a b c, Yankuan Zhang a b d, Shaokui Yan a b, Xin Guan a b, Qingpeng Yang a b, Longchi Chen a b, Yunting Fang a, …
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Genomic Evidence for the Recycling of Complex Organic Carbon …
INTRODUCTION. Recycling of organic matter in sediments is an important component of biogeochemical cycles because marine sediments are critical for long-term carbon storage (1, 2).Prokaryotes in deep oceanic subsurface account for more than 25% of global cell numbers (), and it is still controversial whether Archaea or Bacteria are …
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Crustal carbonate build-up as a driver for Earth's …
Recycling of organic carbon to the surface ... Bachan, A. & Kump, L. R. Sulfur and carbon isotopic evidence for metabolic pathway evolution and a four-stepped …
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Evidence for high organic carbon export to the early Cambrian …
However, direct evidence of high organic carbon export fluxes to the early Cambrian seafloor is lacking, so a key test of the "organic carbon burial hypothesis" for the Cambrian Explosion has not been undertaken to date. Both Mo (δ 98 Mo) and U isotopes (δ 238 U) in organic-rich black shales have been used to track local and global …
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Environmental perturbations during the latest Permian: …
3.1. Organic carbon and mercury isotopes analyses. The organic carbon isotopic ratios are expressed as δ 13 C org, representing per mil (‰) deviation of 13 C/ 12 C ratios in samples from the international standard Vienna Pee Dee Belemnite (VPDB). Before carbon isotope analysis, bulk samples were soaked in 1 mol/L HCl solution to remove …
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Organic carbon burial is paced by a ~173-ka …
Here, we present analyses of multiple high-resolution TOC and stable organic carbon isotope (δ 13 C org) records from the middle to high latitudes during the past 100 Ma ( …
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Academy of Sciences, Shenyang 110016, China
1 Wollastonite addition stimulates soil organic carbon mineralization: Evidences from 12 land- 2 . use types in subtropical China . 3 . Yongxue Yan . a, b, d, 1 ...
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Reduced Lignin Decomposition and Enhanced Soil …
Reduced Lignin Decomposition and Enhanced Soil Organic Carbon Stability by Acid Rain: Evidence from 13 C Isotope and 13 C NMR Analyses. by. Jianping Wu. 1,2, Qi Deng. 2,3,*, Dafeng Hui. 4, Xin Xiong. …
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Sediment deposition changes the relationship between soil organic …
Soil erosion has a significant impact on the distribution and sequestration of soil carbon, affecting the global C cycle. Although the transport and transformation of soil organic carbon (SOC) during the erosion process have been widely studied, there is still a lack of understanding of the impacts of soil erosion on soil inorganic carbon (SIC) and its …
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New evidence for preservation of contemporary …
New evidence for preservation of contemporary marine organic carbon by iron in Arctic shelf sediments. Johan C Faust9,1, Philippa Ascough2, Robert G Hilton3, …
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Reforestation accelerates soil organic carbon accumulation: …
Soils store more carbon (C) belowground than plants and the atmosphere combined, providing a critical ecosystem service. While previous research has shown that sustainable forest management practices can increase soil C storage by enhancing plant productivity, the role of soil microbes remains elusive. We analyzed changes in plant …
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