Historical changes in organic matter input to the muddy sediments along the Zhejiang-Fujian Coast, China over the past 160 years

Chen, Lilei; Liu, Jian; Xing, Lei; Krauss, Ken W.; Wang, Jiasheng; Xu, Gang; Li, Li

doi:10.1016/j.orggeochem.2017.06.003

Cited by 29 publications

(28 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The estimated OCARs in cores C6 and D2 were 3.50–4.67 g C cm −2 year −1 (4.29 ± 0.41 g C cm −2 year −1 ) and 3.94–5.58 g C cm −2 year −1 (4.39 ± 0.47 g C cm −2 year −1 ), respectively (Figure S4), which is comparable to the average global OCAR in shelf sediments (4.15 g C cm −2 year −1 ; Berner, ). However, these values are approximately 2–10 times lower than OCARs reported over the past 50–100 years (9.08–36.3 g C cm −2 year −1 ; Deng et al, ; Li et al, ; Chen et al, ; Lin et al, ). As such, the relatively low OCARs observed in this work can be ascribed to the decreasing supply of sediment discharge from the Yangtze River.…”

Section: Discussionmentioning

confidence: 76%

“…Although the proximal deposit of the Yangtze suffers from severe physical disturbance and/or erosion as a result of the persistently decreasing sediment load (Gao et al, ; Sun et al, ; Yang et al, ), the distal mud of the Yangtze remains a stable deposition environment that accumulates high proportions of fine particles and C org due to the lower energy hydrodynamics (Cao et al, ; Chen et al, ; Li et al, ; Li et al, ; Sun et al, ). This notion is confirmed by the finding that 210 Pb xs activity in cores C6 and D2 is generally characterized by steady‐state profiles, with MARs ranging from 0.06–0.08 g cm −2 year −1 .…”

Section: Discussionmentioning

confidence: 99%

“…Similar to the Fly River (Goñi et al, ), Mississippi River (Allison et al, ), Lena River (Bröder et al, ), and Pearl River (Li et al, ) estuaries, the transport and fate of C org burial in the YRE are regulated by the dispersal and deposition of sediments driven by variable and dynamic sedimentary environments. Past studies have focused on the structure and composition of terrestrial POC from the Yangtze River (Li et al, ; Wu et al, ; Yu et al, ), the source of C org in surface sediments of the ECS (Duan et al, ; Hu et al, ; Xu et al, ), and reconstruction historical C org degradation and preservation in the ECS (Cao et al, ; Chen et al, ; Li et al, ). These studies have greatly enhanced our understanding on the characteristics of terrestrial C org delivered to the coastal ocean and how human‐induced changes in sediment load and nutrient inputs have affected shelf carbon dynamics.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fate of Organic Carbon Burial in Modern Sediment Within Yangtze River Estuary

et al. 2020

View full text Add to dashboard Cite

Large river‐dominated margins play a potential key role in regulating global carbon cycle and budget due to high terrestrial organic carbon (Corg) inputs and sediment accumulation rates. Here bulk elements (Corg and TN), isotopic compositions (δ13Corg and δ15N), radioisotope 210Pb, sedimentary grain size, pH, Eh, and physicochemical properties were analyzed on samples from the Yangtze River Estuary to determine the mechanism involved in transporting sedimentary Corg offshore. In addition, nine box‐cores were analyzed to further reveal the potential effects of the declining sediment load on the modern depositional pattern of Corg. The statistical analyses indicate that the hydrodynamically driven sediment composition exerts a significant control on the transport, mobilization, and accumulation of sedimentary Corg from the river to the estuary, with respect to the redistribution of fine‐grained sediments. Furthermore, X‐radiographs and 210Pb indicate that reworked environment dominates carbon burial in the Yangtze proximal deposit, while a stable sedimentary environment of Corg (3.50–5.58 g cm−2 year−1) is observed in the Yangtze distal mud. Notably, the enhanced erosional inputs that contain terrestrial plant debris (mainly the coarse fractions) have tended to become important sources for Corg. Although reworked sediments in the Yangtze River Estuary are frequently exposed to oxygen during physical and biological processes, there appears to be a high potential for long‐term sedimentary Corg storage, due to its association with sediment particles (mainly the clay fractions) that provide physical protection against its degradation.

show abstract

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fate of Organic Carbon Burial in Modern Sediment Within Yangtze River Estuary

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The samples (2 cm thick) were taken with stainless steel scoops at a 10 cm resolution and were immediately stored at −20°C until organic chemistry analysis. The sedimentation rates measured using 210 Pb and 137 Cs sediment radiochronology methods in cores DZ28 and DZ41 were 0.89 and 2.22 cm/yr (Chen et al, 2017(Chen et al, , 2018a(Chen et al, , 2018b, respectively. Therefore, the investigated intervals were 1852 to 2013 AD for DZ28 and 1949 to 2013 AD for DZ41.…”

Section: Samplingmentioning

confidence: 99%

“…dam construction, soil conservation, land reclamation, agricultural plantations, anthropogenic nutrient input, dust storms, eutrophication) and climatic events (e.g. East Asian Monsoon, Kuroshio/Pacific Decadal Oscillation intensity, and flood events) were the predominant controls on historical changes in OM input, phytoplankton productivity/community structure, sea surface temperature (SST) in the ECS inner shelf, and continental temperature and humidity in the mid-lower Yangtze River basin over the last 160 years (Chen et al, 2017(Chen et al, , 2018a(Chen et al, , 2018b(Chen et al, , 2019. We undertook further analyses of the composition and distribution of various lipid biomarkers, including hydrocarbons, alcohols, and FAs, in core sediments from the inner shelf of the ECS.…”

Section: Introductionmentioning

confidence: 99%

Multiple lipid biomarkers record organic matter sources and paleoenvironmental changes in the East China Sea coast over the past 160 years

et al. 2020

Self Cite

View full text Add to dashboard Cite

The use of lipid biomarkers as paleoenvironmental proxies relies on an accurate assessment of their organic matter (OM) sources. In this study, we analyzed multiple lipids in core sediments recovered from the Zhejiang–Fujian coastal mud area to provide a 160-year record of OM input to the East China Sea (ECS) coastal sediments and to reconstruct paleoenvironmental conditions over this interval. The molecular composition of the samples was characterized by a mixture of natural lipids, particularly those derived from terrestrial vascular plants, marine/riverine plankton and macrophytes, and bacteria. The sources of some lipid components were ambiguous/mixed as they were potentially derived from multiple precursor organisms and because of limitations associated with modern survey techniques. There is evidence that early diagenesis caused the preferential degradation of labile aquatic lipids and that the degradation of terrestrial lipids was more severe when subjected to complex horizontal–vertical transportation processes associated with deposition, resuspension, and redeposition. These processes may have led to an enhanced terrestrial OM signal in the normal ( n)-alkane and n-alkanol records, which is at odds with, for example, those of the n-fatty acids, hopanoids, steranes, and sterols, which suggest a dominant marine OM source. Furthermore, we conclude that the occurrence of multiple sources, selective diagenesis, and test error has led to the distortion of redox and maturity indicators based on evidence from pristane-to-phytane (Pr/Ph) ratios and sterane/hopane indices in century scale. Overall, the phytol record suggests an increase in productivity after the early 20th century. Correspondingly, the diatom lipid biomarker records (based on C25 highly branched isoprenoid alkenes and C18:1ω9 fatty acids) reveal a fluctuating but overall increasing diatom productivity after the early 20th century, which coincides with a decreased proportion of the contribution from diatoms relative to that of total phytoplankton. This is believed to correspond to natural environmental changes, as well as anthropogenic impact.

show abstract

Effect of Global Warming on Lacustrine Productivity and Accumulation of PAHs in Lakes, East China

Ran

Wan

Zhang

et al. 2022

Preprint

View full text Add to dashboard Cite

Multiple organic proxies and lipid biomarkers in the sediment core samples collected from Luoma Lake and Hongze Lake in Jiangsu are used to expound the relationships of global warming with lacustrine productivity and depostion of polycyclic aromatic hydrocarbons. Total organic carbon, S2, and hydrogen index in sedimentary organic matter were obtained with the Rock-Eval analysis. Nutrient status such as total phosphorus and total nitrogen was measured in the sediment cores. The

show abstract

Historical changes in organic matter input to the muddy sediments along the Zhejiang-Fujian Coast, China over the past 160 years

Cited by 29 publications

References 64 publications

Fate of Organic Carbon Burial in Modern Sediment Within Yangtze River Estuary

Fate of Organic Carbon Burial in Modern Sediment Within Yangtze River Estuary

Multiple lipid biomarkers record organic matter sources and paleoenvironmental changes in the East China Sea coast over the past 160 years

Effect of Global Warming on Lacustrine Productivity and Accumulation of PAHs in Lakes, East China

Contact Info

Product

Resources

About