Persistent impact of human activities on trace metals in the Yangtze River Estuary and the East China Sea: Evidence from sedimentary records of the last 60 years

Sun, Xueshi; Fan, Di; Liu, Ming; Liao, Huijie; Tian, Yuan

doi:10.1016/j.scitotenv.2018.10.439

Cited by 32 publications

(16 citation statements)

References 48 publications

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“…With respect to the significant decrease in SARs in the distal mud of the Yangtze, relating to the decreased fluvial sediment supply from the Yangtze River, there is currently no direct evidence to indicate that a significant accretion‐erosion transition of sedimentary C org has occurred in this region. This result is in accordance with previously mentioned findings that a stable environment in the distal mud of the Yangtze River is beneficial for the accumulation of sedimentary C org (Cao et al, ), trace metals (Sun et al, ), and 210 Pb (Gao et al, ). The differences between the depositional states of sedimentary C org in the proximal and distal deposits of the Yangtze delta may be explained by the differences in the fine‐grained sediment supply.…”

Section: Discussionsupporting

confidence: 93%

“…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%

“…All data shown in the sites of Figure 1 were collected from the exact same samples of the surface sediment and water body. Furthermore, certain X-radiographs data and grain-size normalized 210 Pb xs profiles were obtained from Sun et al (2017Sun et al ( , 2019.…”

Section: Analytical Proceduresmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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“…Independent chronostratigraphic information can be provided by 137 Cs, a man-made radionuclide first introduced in the environment after the atmospheric nuclear weapon tests (Robbins and Edgington, 1975;S� anchez et al, 1992;Abril, 2003;Abril et al, 2018). The radiometric dating of estuarine sediments allows estimating sediment accumulation rates and the reconstruction of temporal records of pollution (e.g., � Alvarez-Iglesias et al, 2007;Costa-B€ oddeker et al, 2018;Sun et al, 2019).…”

Section: Studied Areamentioning

confidence: 99%

Environmental radioactivity and trace metals in surficial sediments from estuarine systems in Ghana (Equatorial Africa), impacted by artisanal gold-mining

Klubi

Abril

Mantero

et al. 2020

Journal of Environmental Radioactivity

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“…By testing and checking parameters, such as total organic carbon (TOC), biogenic silica (BSi), and stable carbon isotope(δ 13 C), in core sediments and considering age frame, the sedimentary records of organic matters and their sources in the overlying water could be reconstructed. This method has been widely applied in worldwide mega estuaries, such as the Yangtze Estuary, Mississippi Estuary, Nile Estuary, Pearl River Estuary, and so on [17][18][19][20]. Researchers reconstructed records of the algae community's variation during red tides in the East China Sea over the past century by using core sediments in offshore areas [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Biogenic Silica and Organic Carbon Records in Zhoushan Coastal Sea over the Past One Hundred Years and Their Environmental Indications

Jiang

et al. 2020

IJERPH

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The influence of terrestrial and marine input has dramatically changed eutrophication in coastal seas over the past 100 years. In this study, Zhoushan coastal sea (ZCS) is taken as a study area. We studied ZCS as it is a sink of the temporal and spatial variation of primary productivity, dominant species of algae, and the variation of provenance in this area over the past 100 years. We performed analysis using three sediment cores and the carbon and silicon deposition records. The analysis results demonstrate that: (1) The primary productivity in the northern area of the ZCS close to the Yangtze Estuary was the highest comparatively, but it declined slightly before 2010. The primary productivity in the southern area had an increasing trend over the past 100 years. The value of total organic carbon (TOC) in the northern area was relatively high, with an average value of 0.532% over the past 100 years, with a decreasing trend in recent years. On the contrary, TOC in the southern area was relatively low, but it was increased dramatically after 1995. (2) Diatom might play an important role in the variations. The biogenic silica (BSi) and TOC in the northern area showed a synchronous declining trend, while the BSi/TOC ratio did not change significantly. This indicates the algae population structure in this area was relatively stable over the past 100 years. The BSi/TOC ratio decreased continuously in the southern area, indicating that the dominance of diatoms was decreasing continuously. (3) The variation of diatom dominance in this area might have a great relationship with the change of nutrients’ provenance. A mean value of stable carbon isotope (δ13C) in the north of Zhoushan was −23.46‰, indicating that the terrestrial-source input was the highest. (4) The change of provenance in the study area was quite different. This illustrates that the terrestrial input impacted the largest area of ZCS while marine input became dominant in the offshore area.

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Persistent impact of human activities on trace metals in the Yangtze River Estuary and the East China Sea: Evidence from sedimentary records of the last 60 years

Cited by 32 publications

References 48 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

Environmental radioactivity and trace metals in surficial sediments from estuarine systems in Ghana (Equatorial Africa), impacted by artisanal gold-mining

Biogenic Silica and Organic Carbon Records in Zhoushan Coastal Sea over the Past One Hundred Years and Their Environmental Indications

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Persistent impact of human activities on trace metals in the Yangtze River Estuary and the East China Sea: Evidence from sedimentary records of the last 60 years

Cited by 32 publications

References 48 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

Environmental radioactivity and trace metals in surficial sediments from estuarine systems in Ghana (Equatorial Africa), impacted by artisanal gold-mining

Biogenic Silica and Organic Carbon Records in Zhoushan Coastal Sea over the Past One Hundred Years and Their Environmental Indications

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Persistent impact of human activities on trace metals in the Yangtze River Estuary and the East China Sea: Evidence from sedimentary records of the last 60 years