Iron-bound organic carbon and their determinants in peatlands of China

Huang, Xinya; Li, Xinwei; Liu, Jianliang; Chen, Huai

doi:10.1016/j.geoderma.2021.114974

Cited by 48 publications

(23 citation statements)

References 72 publications

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“…The role of Ca 2+ in increasing the stabilization of organic matter was also reported in previous studies [27,28], which showed that the presence of multivalent cations such as Ca 2+ increases the adsorption of organic matter through the cation bridge mechanism, which in turn increases the organic matter content in soils. The role of Fe in enhancing stabilization is also reported in previous studies [29,30]. The addition of iron oxide to the soil can increase the ability of the soil to absorb organic matter [31,32], which in turn increases the ability of the soil to stabilize organic matter [33,34].…”

Section: Influence Of Coal Fly-ash Application On Production Of Co2 and Ch4supporting

confidence: 61%

Reduction in carbon dioxide and methane production of tropical peatlands due to coal fly-ash application

Saidy

Priatmadi

Septiana

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Tropical peatlands with very high organic carbon (C) contents have the potential to be a source of carbon dioxide (CO2) and methane (CH4) production. Therefore, the management of tropical peatlands is essential to prevent peat decomposition and to reduce the production of CO2 and CH4. We added different amounts of coal fly-ash (CFA) (0, 25, 50, 75, 100 and 125 Mg ha−1) to tropical peats in a laboratory study to quantify changes in CO2 and CH4 production in response to the application of CFA. The amounts of CO2 and CH4 produced by the mixtures of peats and CFA over 90 days were monitored on weekly basis. Peat pH, concentrations of hot-water soluble C, calcium and iron were also measured at the end of incubation period. Results of study revealed that the application of CFA up to 50 Mg ha−1 did not change the production of CO2 and CH4, while the application of CFA by 50–125 Mg ha−1 reduced 12–24% of CO2 and 9–15% of CH4. The decrease in the production of CO2 and CH4 due to the relatively high amount of CFA application was related to the decrease in the amount of hot soluble organic C and the increase in the concentrations of Ca and Fe. This study demonstrates the potential of CFA as waste materials from coal processing of power plants in reducing CO2 and CH4 emissions of tropical peatlands.

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Section: Influence Of Coal Fly-ash Application On Production Of Co2 and Ch4supporting

confidence: 61%

Reduction in carbon dioxide and methane production of tropical peatlands due to coal fly-ash application

Saidy

Priatmadi

Septiana

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Other than pH, soil redox conditions may also strongly affect Fe speciation, Fe‐bound OC and its relative importance in OC CBD (Chen et al., 2020). As a major SOC reservoir (Nichols & Peteet, 2019), wetland soils remain poorly examined in terms of OC CBD because anaerobiosis is considered to weaken Fe‐OC association due to reductive dissolution of Fe(III) (hydr)oxides (Anthony & Silver, 2020; Huang et al., 2021; Huang & Hall, 2017; LaCroix et al., 2019; Zhao et al., 2017). However, wetland soils are characterized in three ways that may facilitate the complexation of OC with reactive Fe and Ca.…”

Section: Introductionmentioning

confidence: 99%

Delineating the Role of Calcium in the Large‐Scale Distribution of Metal‐Bound Organic Carbon in Soils

Wang

Jia

Liu

et al. 2021

Geophysical Research Letters

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Organic carbon (OC) associated with reactive metal oxides, especially noncrystalline ferric iron [Fe(III)] and aluminum (Al) (hydr)oxides, is commonly assessed by the citrate-bicarbonate-dithionite (CBD) method (termed "metal-bound OC" or abbreviated as "OC CBD " hereafter) and estimated to constitute 15%-38% of total OC in sediments and upland soils (Shields et al., 2016;Zhao et al., 2016). However, the relative importance of OC CBD in different land types (e.g., uplands vs. wetlands) and soil depths remains unclear (Mu et al., 2016;Rasmussen et al., 2018;Wan et al., 2019;Zhao et al., 2016), hampering our ability to predict and protect this important OC pool that is vital for the long-term preservation of soil organic carbon (SOC) (Hemingway et al., 2019;Schmidt et al., 2011).While reactive Fe is assumed to play a central role in binding OC, its content has no relationship with the SOC-normalized concentration of OC CBD at regional scales (Mu et al., 2016;Zhao, et al., 2016). Recent evidence suggests that other polyvalent cations and/or mineral phases including manganese (Mn) and silicate (Si) may also be solublized during the CBD treatment and contribute to OC binding (Jugsujinda et al., 1995;Paterson et al., 1993). In particular, calcium (Ca), one of the most abundant polyvalent cations in soils (Rowley et al., 2018), can promote Fe-OC association by forming Fe-OC-Ca ternary co-precipitates (Adhika-

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“…When the force between intra‐aggregates is less than the destructive force caused by water dispersion, larger aggregate will break down to smaller ones. The OC/(Fe + Al) ratio provides information about the possible nature of associated OC and the types of SOC‐mineral interactions (Huang et al, 2021; Kaiser & Guggenberger, 2007) and indicates interaction strength between two OOAs. Kleber et al (2007) suggested that low OC content is retained through strong interactions with minerals (e.g.…”

Section: Discussionmentioning

confidence: 99%

The interactions between Al‐/Fe‐(hydr)oxides and soil organic carbon mediate the aggregation of yellow soils

Xiao

Tang

et al. 2022

Soil Use and Management

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Soil aggregates are essential for improving soil permeability and reducing soil erosion. Still, in high oxide soils, the roles of soil organic carbon (SOC) and Al‐/Fe‐(hydr)oxide in soil aggregation are unclear, which limits our ability to predict how soil aggregation responds to soil management and climate change. In this study, soil samples were collected from three depths of a yellow soil profile (0–12 cm, 12–24 cm and 24–36 cm) and fractionated into aggregates by wet sieving. Organic carbon (OC) and Al‐/Fe‐(hydr)oxide contents of aggregates were determined. We found that the relationships of OC and Al‐/Fe‐(hydr)oxide to aggregate size were depth‐dependent. OC concentrations increased and decreased at 0–12 cm and 24–36 cm depth soils, respectively, as aggregate size decreased. The OC/(Fe + Al) ratios of aggregates suggest that organic carbon will form multi‐layer and mono‐layer coatings on Al‐/Fe‐(hydr)oxide in the 0–12 cm and 24–36 cm depth soils, respectively. This leads to steric hindrances of OC and electrostatic repulsion of Al‐/Fe‐(hydr)oxide at two depths, respectively, and further influenced the aggregation. Based on these findings, we proposed a mechanism in which aggregates are formed by OC and Al‐/Fe‐(hydr)oxide association with the appropriate OC/(Fe + Al) ratio. This mechanism focuses on the role of the OC/(Fe + Al) ratio mediated in soil aggregation. It can account for the inconsistent responses of aggregation and SOC sequestration to exogenous OC addition in field experiments. Further studies are needed and will be helpful to calculate the dose of organic application for formulating healthy and sustainable soil management.

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Iron-bound organic carbon and their determinants in peatlands of China

Cited by 48 publications

References 72 publications

Reduction in carbon dioxide and methane production of tropical peatlands due to coal fly-ash application

Reduction in carbon dioxide and methane production of tropical peatlands due to coal fly-ash application

Delineating the Role of Calcium in the Large‐Scale Distribution of Metal‐Bound Organic Carbon in Soils

The interactions between Al‐/Fe‐(hydr)oxides and soil organic carbon mediate the aggregation of yellow soils

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