organic carbon evidences

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 ...

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 …

Direct evidence indicates that revegetation improves organic carbon …

In high N and low C sediments, studies have often found that the availability of organic carbon becomes a limiting factor for denitrification processes (Grebliunas and Perry, 2016). For headwater river ecosystems, the confluence of surface or subsurface runoff into rivers is often accompanied by higher terrestrial C source inputs and lower N ...

Direct evidence for microbial-derived soil organic matter

We determined soil organic carbon (SOC) accumulation rates and stability in the initially C-free model soils. Across all model soils, SOC increased consistently over time (P<0.05; Table 1).

Materials and pathways of the organic carbon cycle …

The cycle of organic carbon through the atmosphere, oceans, continents and mantle reservoirs is a hallmark of Earth. Over geological time, chemical exchanges between those reservoirs have...

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 …

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 …

Post-farming land restoration schemes exhibit higher soil …

For example, vegetation restoration can improve soil organic carbon storage, soil aggregate stability, and soil and water conservation (Liu et al., 2019). Returning farmland to forest can increase organic carbon storage by 20–50%, but converting forest to farmland can reduce organic carbon storage by ∼ 40% (Guo and Gifford, 2002).

14C-Dead Living Biomass: Evidence for Microbial Assimilation of …

14 C provides a useful tracer of carbon sources in many surficial environments. Atmospheric CO 2 is enriched in 14 C, which decays to 14 N with a half-life of 5730 years. Thus, any organic material greater than ∼60,000 years in age, or any biomolecule assembled from an ancient carbon source, contains essentially no 14 C. …

Heavy thinning reduces soil organic carbon: Evidence from …

Forest thinning is a common forest management practice and has complex effects on soil organic carbon (SOC). However, the mechanisms underlying SOC and its components (physical fractions and chemical compositions) in response to forest thinning remain poorly understood. Four thinning treatments including control (CK with no thinning), light …

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 …

Reduced Lignin Decomposition and Enhanced Soil Organic Carbon …

Understanding the soil organic matter (SOM) dynamics in forest ecosystems is important because soils are the largest pool of carbon (C) on Earth [6,7].As a key ecological process responsible for the transfer of organic matter from vegetation to soil, plant litter decomposition plays a critical role in global C cycling [8,9,10].Plant …

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 ...

Heavy thinning reduces soil organic carbon: Evidence from …

Request PDF | Heavy thinning reduces soil organic carbon: Evidence from a 9-year thinning experiment in a pine plantation | Forest thinning is a common forest management practice and has complex ...

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 …

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 …

Biochar increases soil carbon pools: Evidence from a …

Biochar is a carbon-rich material that increases soil C sequestration and mitigates climate change. However, due to the variability of experimental conditions, types of biochar and soil, the influence of biochar on the accumulation of different soil carbon fractions remains unclear. Therefore, a meta-analysis was performed that included 586 ...

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 ( …

Soil organic carbon dynamics following natural vegetation …

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 amount in terrestrial vegetation (Lal, 2004), and thus has a most important role in balancing atmospheric carbon dioxide (CO 2) concentration (Briones et al., 2006).Whether soil …

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 ...

Global Change Biology | Environmental Change …

Abstract. The increasing concentration of CO 2 in the atmosphere is perturbing the global carbon (C) cycle, altering stocks of organic C, including soil …

(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 ...

Responses of soil organic carbon turnover to nitrogen …

The SOC pool comprises approximately 2/3 of the terrestrial organic carbon (Post et al., 1990; Amundson, 2001). Its alteration in response to N enrichment may significantly influence the carbon dioxide (CO 2 ) concentration in atmosphere and thus has implications for global C cycle and climate change.

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 …

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 …

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 …

Wollastonite addition stimulates soil organic carbon …

Wollastonite addition stimulates soil organic carbon mineralization: Evidences from 12 land-use types in subtropical China - ScienceDirect. CATENA. …

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 …

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 ...

Variability in organic carbon reactivity across lake residence …

The transport of dissolved organic carbon from land to ocean is a large dynamic component of the global carbon cycle. Inland waters are hotspots for organic matter turnover, via both biological ...