Distribution and source of organic matter in surface sediment from the muddy deposit along the Zhejiang coast, East China Sea

Xu, Gang; Liu, Jian; Hu, Gang; Jonell, Tara N.; Chen, Lilei

doi:10.1016/j.marpolbul.2017.08.053

Cited by 23 publications

(15 citation statements)

References 41 publications

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“…These results suggest that C/N ratios are not a robust indicator of organic matter. In previous studies, it was found that C/N ratios cannot be directly used to distinguish between organic matter sources in the Pearl River Estuary [4,5,40], the coastal part of the Bohai Bay [10], along the Zhejiang coast [41], and elsewhere in the world [13,31,42]. This may be due to the breakdown processes (e.g., microbial mineralization, leaching, autolysis) of the POM [15,39] and/or anthropogenic disturbances [43].…”

Section: Correlation Analysismentioning

confidence: 99%

Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China

Chen

Zhang

et al. 2021

JMSE

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In this study, the isotopic composition (δ13C and δ15N), total organic carbon content, total nitrogen content, and C/N ratios of suspended particulate organic matter (POM) in Zhanjiang Bay, which is a semi-enclosed bay with concentrated artificial activities in Southern China, were analyzed in order to investigate the seasonal variations in the principal POM sources in the monsoon region. In summer, the δ13C and δ15N values showed a weak correlation with the chlorophyll a (Chl a), suggesting that terrigenous sources were dominant. However, in winter, the particulate organic carbon and particulate nitrogen values were correlated with the Chl a in the middle bay and bay mouth. Moreover, the δ13C values showed a significant correlation with Chl a during the winter, indicating that the contribution of the in situ phytoplankton was relatively important and was affected by the monsoon in winter. Compared with the corresponding δ13C values, the δ15N values exhibited a complex spatial distribution. By using a Bayesian mixing model, in the upper bay, the source of POM was mainly from marine organic matter (49%) in summer, and almost an equilibrated contribution of all sources in winter. In the middle bay and bay mouth, the POM contribution mainly originated from marine organic matter (53%) during the winter. In contrast, the POM source was mainly soil organic matter (63%) in summer, suggesting that the POM was sourced from the runoff from the upstream basin. Our results suggest that the seasonal shifts of the source of POM should be taken into account when estimating C or N mass balance in the monsoon-controlled bay.

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Section: Correlation Analysismentioning

confidence: 99%

Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China

Chen

Zhang

et al. 2021

JMSE

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“…It is speculated to be influenced by the upwelling which brings abundance phosphate. This caused a relatively low value of N/P, which is conducive to diatom growth [15,49]. Lou (2011) reported that upwelling could deliver bottom nutrients to the surface of sea as a supplementation to phosphate in southeastern area of Zhoushan Islands [50].…”

Section: Provenance Variation Of Bsi and Tocmentioning

confidence: 99%

“…However, the role of marine sourced nutrients in harmful algal blooming of the ZCS is still worthy of a further study, as this area is also influenced by the upwelling which may bring numerous marine sourced nutrients. The variation of nutrients and their sources in the overlying water can be kept and recorded well by core sediments in offshore areas [14][15][16]. 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.…”

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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“…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%

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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Distribution and source of organic matter in surface sediment from the muddy deposit along the Zhejiang coast, East China Sea

Cited by 23 publications

References 41 publications

Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China

Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China

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

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

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