Bulk organic δ13C and C/N as indicators for sediment sources in the Pearl River delta and estuary, southern China

Yu, Fang; Zong, Yongqiang; Lloyd, Jeremy M.; Huang, Guangqing; Leng, Melanie J.; Kendrick, Christopher P.; Lamb, Angela L.; Yim, Wyss W. -S.

doi:10.1016/j.ecss.2010.02.018

Cited by 257 publications

(172 citation statements)

References 59 publications

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“…This accords with the results of Yu et al (2010) who reported considerable changes between δ C value of soil samples with various sources but found no significant difference in C/N values. Stable isotope ratios are properties of the in situ bulk SOM; however, photometric indexes are based on only the alkali soluble components of SOM, and accordingly, the soluble part does not represent the solid SOM as it was reported by Lehmann and Kleber (2015).…”

Section: Figsupporting

confidence: 82%

A 300-year record of sedimentation in a small tilled catena in Hungary based on δ13C, δ15N, and C/N distribution

et al. 2018

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Purpose Soil erosion is one of the most serious hazards that endanger sustainable food production. Moreover, it has marked\ud effects on soil organic carbon (SOC) with direct links to global warming. At the same time, soil organic matter (SOM) changes in\ud composition and space could influence these processes. The aim of this study was to predict soil erosion and sedimentation\ud volume and dynamics on a typical hilly cropland area of Hungary due to forest clearance in the early eighteenth century.\ud Materials and methods Horizontal soil samples were taken along two parallel intensively cultivated complex convex-concave\ud slopes from the eroded upper parts at mid-slope positions and from sedimentation in toe-slopes. Samples were measured for SOC,\ud total nitrogen (TN) content, and SOMcompounds (δ13C, δ15N, and photometric indexes). They were compared to the horizons of\ud an in situ non-eroded profile under continuous forest. On the depositional profile cores, soil depth prior to sedimentation was\ud calculated by the determination of sediment thickness.\ud Results and discussion Peaks of SOC in the sedimentation profiles indicated thicker initial profiles, while peaks in C/N ratio and\ud δ13C distribution showed the original surface to be ~ 20 cm lower. Peaks of SOC were presumed to be the results of deposition of\ud SOC-enriched soil from the upper slope transported by selective erosion of finer particles (silts and clays). Therefore, changes in\ud δ13C values due to tillage and delivery would fingerprint the original surface much better under the sedimentation scenario than\ud SOC content. Distribution of δ13C also suggests that the main sedimentation phase occurred immediately after forest clearance\ud and before the start of intense cultivation with maize.\ud Conclusions This highlights the role of relief in sheet erosion intensity compared to intensive cultivation. Patterns of δ13C\ud indicate the original soil surface, even in profiles deposited as sediment centuries ago. The δ13C and C/N decrease in buried in\ud situ profiles had the same tendency as recent forest soil, indicating constant SOM quality distribution after burial. Accordingly,\ud microbiological activity, root uptake, and metabolism have not been effective enough to modify initial soil properties

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Section: Figsupporting

confidence: 82%

A 300-year record of sedimentation in a small tilled catena in Hungary based on δ13C, δ15N, and C/N distribution

et al. 2018

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“…PON was positively correlated with TSS and was higher in TMZ than that in the non-TMZ, these results indicated that resuspended sediments contributed to PON. TSS originating from autochthonous production (phytoplankton biomass) and allochthonous inputs such as terrigenous organic material (Garnier et al, 2008), autochthonous production are riched in N compared to that of terrestrial organic material (Yu et al, 2010). There are several high outlier points around the line in the 100 to 200 mg/L range (Fig.…”

Section: Influence Of Suspended Substances On Dynamics Of Nutrients Amentioning

confidence: 98%

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Huang

et al. 2017

Journal of Environmental Sciences

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“…Terrestrial OM is a notable component of sedimentary OM in the Pearl River estuary and its western coast (He et al, 2010;Hu et al, 2006;Yang et al, 2011;Yu et al, 2010;Zhang et al, 2009), but concentrations of terrestrial OM decline rapidly across the shelf (Hu et al, 2006). These surveys provide valuable insights about carbon cycling in the Pearl River estuary and adjacent shelf region, but the distributions and fates of terrestrial OM as well as marine OM in the sediments of the NSCS remain poorly characterized.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, stable carbon isotopic ratios and C/N ratios are frequently used to distinguish terrestrial and marine sources of sedimentary OM (Bianchi et al, 2002;Gordon and Goñi, 2003;Hu et al, 2006;Yu et al, 2010). Biomarkers derived from terrestrial plants, marine plankton, and bacteria can provide more specific and complementary data for tracing the origins of OM.…”

Section: Introductionmentioning

confidence: 99%

Sources, distributions, and early diagenesis of sedimentary organic matter in the Pearl River region of the South China Sea

Zhang

Kaiser

et al. 2014

Marine Chemistry

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Bulk organic δ13C and C/N as indicators for sediment sources in the Pearl River delta and estuary, southern China

Cited by 257 publications

References 59 publications

A 300-year record of sedimentation in a small tilled catena in Hungary based on δ13C, δ15N, and C/N distribution

A 300-year record of sedimentation in a small tilled catena in Hungary based on δ13C, δ15N, and C/N distribution

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Sources, distributions, and early diagenesis of sedimentary organic matter in the Pearl River region of the South China Sea

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