Source, transport and fate of terrestrial organic carbon from Yangtze River during a large flood event: Insights from multiple-isotopes (δ13C, δ15N, Δ14C) and geochemical tracers

Sun, Xueshi; Fan, Di; Cheng, Peng; Hu, Limin; Sun, Xinghuai; Guo, Zhiyong; Yang, Zuosheng

doi:10.1016/j.gca.2021.06.004

Cited by 47 publications

(28 citation statements)

References 84 publications

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“…In general, coarse sediments and discrete plant‐derived debris are often retained in deltaic environments, while fine‐grained, mineral‐associated OC is preferentially transported offshore (Bao, Blattmann et al., 2019 ; Bao, van der Voort et al., 2018 ; Bianchi et al., 2007 ; Keil et al., 1994 ; X. Sun et al., 2021 ). In addition to hydrodynamic controls, the efficiency of OC export and burial associated with fine‐grained sediments is generally considered greater due to a larger mineral surface area (SA) that promotes stabilization of associated organic matter (Bao, Zhao et al., 2019 ; Kögel‐Knabner et al., 2008 ; Mayer, 1994 ; Tesi et al., 2016 ; Wakeham & Canuel, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

“…Hydrodynamic sorting further influences the OC dispersal from land to adjacent shelf regions (Bao, Uchida et al, 2018;Bröder et al, 2018;Bröder, Tesi, Salvadó et al, 2016;Tesi et al, 2016). In general, coarse sediments and discrete plant-derived debris are often retained in deltaic environments, while fine-grained, mineral-associated OC is preferentially transported offshore (Bao, Blattmann et al, 2019;Bao, van der Voort et al, 2018;Bianchi et al, 2007;Keil et al, 1994;X. Sun et al, 2021).…”

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confidence: 99%

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Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris

et al. 2022

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Much attention has been focused on fine‐grained sediments carried as suspended load in rivers due to their potential to transport, disperse, and preserve organic carbon (OC), while the transfer and fate of OC associated with coarser‐grained sediments in fluvial systems have been less extensively studied. Here, sedimentological, geochemical, and biomolecular characteristics of sediments from river depth profiles reveal distinct hydrodynamic behavior for different pools of OC within the Mackenzie River system. Higher radiocarbon (14C) contents, low N/OC ratios, and elevated plant‐derived biomarker loadings suggest a systematic transport of submerged vascular plant debris above the active riverbed in large channels both upstream of and within the delta. Subzero temperatures hinder OC degradation promoting the accumulation and waterlogging of plant detritus within the watershed. Once entrained into a channel, sustained flow strength and buoyancy prevent plant debris from settling and keep it suspended in the water column above the riverbed. Helical flow motions within meandering river segments concentrate lithogenic and organic debris near the inner river bends forming a sediment‐laden plume. Moving offshore, we observe a lack of discrete, particulate OC in continental shelf sediments, suggesting preferential trapping of coarse debris within deltaic and neritic environments. The delivery of waterlogged plant detritus transport and high sediment loads during the spring flood may reduce oxygen exposure times and microbial decomposition, leading to enhanced sequestration of biospheric OC. Undercurrents enriched in coarse, relatively fresh plant fragments appear to be reoccurring features, highlighting a poorly understood yet significant mechanism operating within the terrestrial carbon cycle.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris

et al. 2022

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“…The Huanghe δ 13 C org endmember of -24.0 ± 0.4 and 1/POC of 3.52 ± 1.85 were estimated from POC samples collected at the Kenli hydrographic station (37.61 • N, 118.54 • E; n = 13) closest to the modern Huanghe estuary in Dongying city (Tao et al, 2015;Yu et al, 2019a). The Changjiang δ 13 C org endmember of -26.4 ± 0.8 and 1/POC of 0.60 ± 0.44 were estimated from POC samples collected at Xuliujing (31.78 • N, 120.93 • E; n = 4) and Jiangyin (31.91 • N, 120.26 • E; n = 1) hydrographic stations (Wu et al, 2018) and four sampling sites with salinity of 0 in the Changjiang estuary (C1, C3, C5, C7; n = 11; Sun et al, 2021). The δ 13 C org endmember of -27.2 ± 3.5 and 1/POC of 0.06 ± 0.05 for Geum River were estimated by POC collected from GR1 site (36.10 • N, 126.87 • E; n = 11; Kang et al, 2019).…”

Section: Potential Source Endmembersmentioning

confidence: 99%

“…The TOC/TN endmembers of 7.8 ± 2.2 (n = 6) for Huanghe and 7.6 ± 0.5 (n = 11) for Changjiang were constrained by POC samples collected at the Kenli hydrographic station (Yu et al, 2019a) and at sites C1, C3, C5, C7 in Changjiang estuary (Sun et al, 2021), respectively (Figure 1). The TOC/TN ratio endmembers of 13.0 ± 4.5 (n = 11) for Geum River, 5.9 ± 0.8 (n = 6) for Youngsan River and 6.7 ± 1.4 (n = 16) for Han River were constrained by POC samples collected at sites GR1 (Kang et al, 2019), YS3 (Lee et al, 2013) and the lower reach of the Han River (Yoon et al, 2016), respectively.…”

Section: Potential Source Endmembersmentioning

confidence: 99%

Influences of the 1855 AD Huanghe (Yellow River) Relocation on Sedimentary Organic Carbon Burial in the Southern Yellow Sea

Liu

Ding

et al. 2022

Front. Mar. Sci.

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The Huanghe (Yellow River) supplies large amount of sediments and terrestrial organic carbon (OC) to the eastern Chinese marginal seas. A relocation of the Huanghe outlet from the southern Yellow Sea (YS) to the Bohai Sea occurred in 1855 AD, however, detailed knowledge about the impact of this relocation on sedimentary source and OC burial in Chinese marginal seas is still critically lacking. In this study, we present total OC content and its isotope (δ13C), along with bulk total organic carbon (TOC)/total nitrogen (TN) molar ratio and lipid biomarker contents, in a sediment core HH12 from the southern YS with sediment age spanning the last 300 years. We find that TOC and terrestrial lipid biomarker mass accumulation rates were lower between 1855 AD and 1950 AD than that prior to 1855 AD in core HH12; and in accordance, both TOC/TN ratio and δ13C records indicate a gradual decrease of terrigenous source contributions to sedimentary OC. This suggests that the relocation of the Huanghe outlet reduced the transport of terrestrial OC to the southern YS. However, the δ13C record also indicates a relative increase of terrestrial OC contribution to sedimentary OC after 1950 AD, and the most likely explanation is increased contributions from the old Huanghe delta erosion and Korean rivers. Future studies should focus on better constraining the variations of terrestrial and marine endmembers with δ13C and Δ14C analyses of specific biomarkers to examine these linkages.

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“…Old surficial sediment OC ages are also observed in energetic coastal regions distal from terrigenous point sources (Blair et al., 2003; Sun et al., 2021). Recent evidence suggests that hydrodynamic processes may exert strong influence on the age of OC as a consequence of sediment resuspension and redistribution on continental margins (Bao, Uchida, et al., 2018, 2018b; Bröder et al., 2018; Keil et al., 2004).…”

Section: Introductionmentioning

confidence: 99%

Differentiating the Causes of Aged Organic Carbon in Marine Sediments

Chu

Zhao

Eglinton

et al. 2022

Geophysical Research Letters

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Aged organic carbon (OC) occurs widely in surface sediments deposited in shallow continental margin settings (Griffith et al., 2010;Inthorn et al., 2006;Tesi et al., 2016). Old terrestrial OC (OC terr ), including both petrogenetic OC (OC petro ) derived from bedrock erosion (Hemingway et al., 2018), as well as terrestrial biospheric pre-aged OC (OC pre-aged ) subject to storage in intermediate terrestrial reservoirs (e.g., soils;Eglinton et al., 2021;G. K. Li et al., 2021;Tao et al., 2015) prior to export may be much older than that produced in the marine environment. Together, these terrigenous inputs partly contribute to older ages of OC than would be predicted based on inputs exclusively derived from marine productivity. The influence of old terrigenous OC is prevalent in the Chinese marginal seas (CMS), for example, the OC pre-aged from the Yellow River (Tao et al., 2016;Xue et al., 2017) and the OC petro from the Taiwan Island (Dadson et al., 2003;Lin et al., 2020). Therefore, the presence of aged OC in marine sediments is often attributed to supply of OC terr from land (e.g., Hilton et al., 2015).Old surficial sediment OC ages are also observed in energetic coastal regions distal from terrigenous point sources (

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Source, transport and fate of terrestrial organic carbon from Yangtze River during a large flood event: Insights from multiple-isotopes (δ13C, δ15N, Δ14C) and geochemical tracers

Cited by 47 publications

References 84 publications

Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris

Vegetal Undercurrents—Obscured Riverine Dynamics of Plant Debris

Influences of the 1855 AD Huanghe (Yellow River) Relocation on Sedimentary Organic Carbon Burial in the Southern Yellow Sea

Differentiating the Causes of Aged Organic Carbon in Marine Sediments

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