Iron geochemistry and organic carbon preservation by iron (oxyhydr)oxides in surface sediments of the East China Sea and the south Yellow Sea

Ma, Weiwei; Zhu, Mao‐Xu; Yang, Gui‐Peng; Li, Tie

doi:10.1016/j.jmarsys.2017.10.009

Cited by 47 publications

(76 citation statements)

References 83 publications

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“…The average f Fe‐bound OC of the arable soils in our study was less than that of some surface marine sediments (21.7 ± 7.8%) (Lalonde et al, ) and US forest soils (37.8 ± 20%) (Zhao et al, ). However, our results were comparable to those of the permafrost soils of the Qinghai‐Tibetan Plateau (19.5 ± 12.3%) (Mu et al, ) and of East China Sea sediments (13.2 ± 8.85%) (Ma et al, ). Based on an estimate that the total carbon pool of agricultural soils in China was 16.32 Pg (Tang et al, ), we could predict that 2.56 ± 1.04 Pg of Fe‐bound OC resides in the agricultural soils of the country by scaling up our results to a nationwide estimate.…”

Section: Resultssupporting

confidence: 87%

“…Organic carbon can be associated with Fe oxides by adsorption and coprecipitation mechanisms (Chen, Dynes, Wang, & Sparks, ; Kaiser & Guggenberger, ). It has been widely demonstrated that Fe oxides play an important part in preserving organic carbon in soils and sediments (Lalonde, Mucci, Ouellet, & Gélinas, ; Ma, Zhu, Yang, & Li, ; Salvadó et al, ; Zhao et al, ). Recent quantitative characterization indicated that 37.8% of SOC was bound to Fe oxides in forest soils of the USA (Zhao et al, ) and 19.5 ± 12.3% of SOC was trapped by Fe oxides in permafrost regions of the Qinghai‐Tibet Plateau, China (Mu et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…A substantial body of research has indicated that iron oxides play an important role in preserving organic carbon in sediments (Lalonde et al, ; Ma et al, ; Shields et al, ), soils of permafrost regions (Mu et al, ; Salvadó et al, ), forest soils (Zhao et al, ) and agricultural soils (Drosos et al, ; Drosos & Piccolo, ; Huang et al, , ). However, little information about the quantitative characterization of Fe‐bound OC across different agricultural soils and its governing factors has been available.…”

Section: Introductionmentioning

confidence: 99%

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Iron oxides selectively stabilize plant‐derived polysaccharides and aliphatic compounds in agricultural soils

Wan

et al. 2019

European J Soil Science

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A strong link exists between iron oxides and soil organic carbon (SOC). However, the role of iron oxides in the preservation of SOC in agricultural soil remains poorly understood. In this study, we comprehensively examined the concentration, molecular composition and biological sources of iron oxide‐bound organic carbon (Fe‐bound OC) in arable soils collected from 12 sites in central and east China. The results indicated that 6.2–31.2% of the SOC was bound to iron oxides in agricultural soil and that the binding mechanisms varied from adsorption in most soils to coprecipitation in those with a large content of organic carbon. The distribution of Fe‐bound OC showed no clear variation in relation to site, but Fe‐bound OC reached a peak in soils with an annual mean temperature of 16.4°C. Correlation analysis demonstrated that TOC might be the main determinant for the amount of Fe‐bound OC and that the binding mechanism is influenced by both TOC and the active Fe ratio. Comprehensive studies of C/N, 13C isotope and synchrotron radiation‐based Fourier transform infrared (SR‐FTIR) spectroscopy showed that iron oxides selectively protected plant‐derived aliphatic compounds and polysaccharides in agricultural soil. This study revealed the quantitative characterization, biological sources and molecular composition of Fe‐bound OC in arable soils, which provides useful information for evaluating and managing the global C cycle under the framework of climate change.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Iron oxides selectively stabilize plant‐derived polysaccharides and aliphatic compounds in agricultural soils

Wan

et al. 2019

European J Soil Science

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“…Sampling stations and regional ocean circulation patterns in the Bohai Sea (BHS) and southern Yellow Sea (SYS); modified after S. Y. Yang et al (), Song et al (), and Ma et al (). NJCC: North Jiangsu Coastal Current; BSCC: Bohai Sea Coastal Current; YSCC: Yellow Sea Coastal Current; YSWC: Yellow Sea Warm Current, LDCC: Liaodong Coastal Current.…”

Section: Introductionmentioning

confidence: 99%

“…The area delineated by dash line is the Yellow Sea Cold Water Mass (YSCWM). Sites are from Ma et al (); sites are used only for study of iron‐associated organic carbon; both and sites are used for iron speciation.…”

Section: Introductionmentioning

confidence: 99%

Reactive Iron and Iron‐Bound Organic Carbon in Surface Sediments of the River‐Dominated Bohai Sea (China) Versus the Southern Yellow Sea

et al. 2019

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Factors influencing reactive Fe cycling and its protection of organic carbon (OC) in sediments are poorly understood. Here we comparatively study Fe speciation and Fe‐associated OC (Fe‐OC) in surface sediments of the Bohai Sea (BHS) and southern Yellow Sea (SYS), two seas with common sediment sources but different depositional regimes. Though significant sequestration of highly reactive Fe (FeHR) is expected in the estuarine system stream from the river‐dominated BHS, this pool is, however, slightly enriched in the BHS sediments relative to their source material. This reconfirms a previous speculation of sedimentary FeHR enrichment in semi‐protected settings. Relative to the BHS, the SYS sediments are depleted of FeHR, despite common sediment sources of these two areas. Estuarine pre‐enrichment and subsequent redistribution of FeHR in the BHS, and aging of Fe‐bearing authigenic clays during transport from the BHS to the SYS are potential mechanisms for the depletion. The fractions (fFe‐OC) of Fe‐OC in total OC in sediments of the two seas are at the lower end for soils and sediments, indicating Fe being a minor “rusty sink.” 13CFe‐OC fractionations indicate preferential sequestration of terrestrial OC by Fe oxides in the BHS, in contrast with preferential retention of marine OC in the SYS. Different fractionations of 13CFe‐OC in the two seas are a net result of selective adsorption of OC by Fe oxides and selective stabilization of OC during Fe reductive dissolution. Preferential sequestration of terrestrial OC may exert an important influence on distribution and compositions of OC buried in the river‐dominated system.

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Organic carbon burial with reactive iron across global environments

Longman

Faust²,

Bryce

et al. 2022

Preprint

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The burial of carbon in the marine realm exerts a controlling influence on the global carbon cycle (Falkowski et al., 2000). In particular, the burial of organic carbon (OC) in marine sediments is the largest long-term net sink for carbon on Earth (Burdige, 2007), with 200 megatonnes of carbon buried in this manner per year (Mt C yr −1 , Canadell et al., 2021). Thus, OC burial in marine sediments plays a key role in controlling atmospheric CO 2 on geological timescales. Therefore, knowing the factors controlling the size, efficacy, and longevity of this sink is vital for understanding long-term carbon cycling (Burdige, 2007;Hedges & Keil, 1995).The vast majority of OC reaching the seafloor is remineralized before burial within the sediment (on average 87% of OC is remineralized at the sediment water interface; Burdige, 2007), meaning it returns to the equilibrating ocean-atmosphere CO 2 system. Burial of the OC fraction which does not get remineralized is highly dependent on

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Iron geochemistry and organic carbon preservation by iron (oxyhydr)oxides in surface sediments of the East China Sea and the south Yellow Sea

Cited by 47 publications

References 83 publications

Iron oxides selectively stabilize plant‐derived polysaccharides and aliphatic compounds in agricultural soils

Iron oxides selectively stabilize plant‐derived polysaccharides and aliphatic compounds in agricultural soils

Reactive Iron and Iron‐Bound Organic Carbon in Surface Sediments of the River‐Dominated Bohai Sea (China) Versus the Southern Yellow Sea

Organic carbon burial with reactive iron across global environments

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