Influence of sedimentary organic matter sources on the distribution characteristics and preservation status of organic carbon, nitrogen, phosphorus, and biogenic silica in the Daya Bay, northern South China Sea

Dan, Solomon Felix; Li, Shengyong; Yang, Bin; Cui, Dongyang; Ning, Zhiming; Huang, Haifang; Zhou, Jiaodi; Yang, Jian

doi:10.1016/j.scitotenv.2021.146899

Cited by 26 publications

(3 citation statements)

References 108 publications

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“…According to the sediment quality guide prepared by the Canadian Ministry of Environment and Energy, the pollution classes are as follows; N ≤ 0.05% uncontaminated, N > 0.48% heavily contaminated. P ≤ 0.06% uncontaminated, P > 0.2% severely contaminated (Yang et al 2017;Dan et al 2020;Dan, et al 2021). The increase in N pollution, which started at the 15 th cm of the core, approached a serious level in the surface slice.…”

Section: Resultsmentioning

confidence: 96%

GIS Analysis of spatial-temporal variation of the ecological risk caused by element and organic pollutants in Lake Marmara (TURKIYE)

Fural

2023

International Journal of Environment and Geoinformatics

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Located in western Anatolia (Turkey), Lake Marmara is a wetland with high ecological value. Lake Marmara, which was exposed to intense anthropogenic effects after 1940, is experiencing ecological deterioration in recent years. This study aimed to analyze the ecological risk level of the lake by using Enrichment Factor (EF), Toxic Risk Index (TRI), Modified Potential Ecological Risk Index (mER) etc. The research hypothesized that the discharge of water from the Gediz River and Kum Stream to the lake after 1940 triggered ecological risk problems. Moderate toxic risk, low potential ecological risk, moderate element contamination were detected throughout the lake. It was determined that Mo, P and Hg of anthropogenic origin and As, Ni, Cr, Cu of lithological origin created ecological risk at a regional scale. Domestic-industrial wastes and agriculture in the Gediz River basin and around the lake were identified as the dominant anthropogenic activity. The temporal variation of the ecological risk indices based on the elements did not reflect the anthropogenic traces of water discharge into the lake from the Gediz River basin. However, the temporal variation of TOC, N, P and CDP showed the effects of anthropogenic interventions in the lake. According to the threshold values; P is highly contaminated and N is close to the severely contaminated limit. The findings, while confirming the research hypothesis, showed that the dominant ecological risk factor in Lake Marmara is not elemental contamination, but organic pollutants, nitrogen and phosphate.

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Section: Resultsmentioning

confidence: 96%

GIS Analysis of spatial-temporal variation of the ecological risk caused by element and organic pollutants in Lake Marmara (TURKIYE)

Fural

2023

International Journal of Environment and Geoinformatics

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“…It has been revealed that the phosphorus load along the coastal estuaries of China is an important factor for decreasing TOC stability in sediments (Dan et al, 2021). Therefore, investigating the phosphorus load in coastal zones is crucial for accurately assessing the source and sink trend of marine "blue carbon".…”

Section: Different Forms Of Phosphorus Correlated With Tocmentioning

confidence: 99%

Vertical distribution of Fe, P and correlation with organic carbon in coastal sediments of Yellow Sea, Eastern China

Gao

Chen

et al. 2023

Front. Mar. Sci.

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The coastal zone is considered as a major carbon pool. Iron minerals and phosphates are vital factors affecting the amounts and occurrence of total organic carbon (TOC) in sediments. However, coupling mechanisms of iron (Fe) and phosphorous (P) in the source-sink transition of TOC in coastal sediments is poorly understood. This study characterized the distribution of Fe, P and TOC contents of three independent 170 cm sediment cores sampled from a coastal aquaculture area in the eastern Jiangsu Province, and quantified the correlations among Fe, P, median grain diameter (Dx(50)), and TOC. The results showed total phosphorus (TP) content ranges in a scope of 337.4-578.0 mg/kg, and many depths recorded moderate P eutrophication. Inorganic phosphorus (DA + IP) and biogenic apatite were the primary components of TP, accounting for 25.19–55.00 and 26.71–49.62%, respectively. The Fe contents varied from 987.9 mg/kg to 2900.7 mg/kg, in which oxidized iron (Feox) accounted for about 62.2–79.4%. In the vertical profile, the TOC was positively correlated with the contents of low-crystallinity Fe-bearing carbonates (Fecarb), high crystallinity pyrite (FePy), iron-bound phosphorus (PCDB), manganeses (Mn), and nitrogen (N), while it was negatively correlated with DA + IP, organic phosphorus (OP), and Dx(50). Based on the the partial least squares (PLS) model, we proposed that the higher FePy, Mn, magnetite (FeMag), Fecarb, PCDB, amorphous exchangeable Fe (Ex-Fe), and authigenic apatite phosphorus (Bio-P) in sediments represent the high capacity for TOC sink, whereas, higher DA + IP, and OP indicate a TOC conversion to the source. The non-siginificat indication of Feox on TOC source-sink is due to its surplus and strong reactivity relative to TOC content. These revealed correlations provide a theoretical reference for understanding and regulating the burial rate and storage of TOC by changing the input of Fe minerals and P components into coastal sediments.

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“…In farming areas, biodeposits may dominate the fluxes, and as a result, the total organic carbon may be primarily composed of, and characterized by, biodeposits. − δ 13 C and δ 15 N stable isotopes, which enable the estimation of the contribution of different sources of organic matter to the sediment based on the distinct isotopic signatures of the different sources, have been used to determine the contribution of bivalve farming to sediment organic carbon. , Although previous studies have identified the contribution of bivalve biodeposits to sediment organic carbon in complex coastal environments that receive materials from a variety of carbon sources, these studies often only consider benthic responses within the farming area. This may create an unbalanced spatial distribution at the ecosystem level.…”

Section: Introductionmentioning

confidence: 99%

Vacuum Effect: A Redistribution Process of Organic Carbon Mediated by Bivalve Farming

Sun,

Filgueira,

Wang

et al. 2023

ACS EST Water

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Bivalve farming affects the spatiotemporal distribution of organic carbon deposition to benthic environments, potentially altering ecosystem functioning. In this study, spatiotemporal patterns of benthic organic carbon flux of a bottom-based Manila clam (Ruditapes philippinarum) farm were estimated for a 1 year farming cycle using a carbon flux model coupled to a two-dimensional (2-D) hydrodynamic (MIKE-3) and a clam dynamic energy budget (DEB) model. The simulated flux was compared to the sediment total organic carbon (TOC) and contribution of biodeposits to sediment TOC based on stable isotope signatures. The outputs of the model illustrated a clear “vacuum effect” with increased carbon flux within and near the farming area (deposition area) and reduced flux outside the farm (depletion area), which could also correspond to changes in sediment TOC. Moreover, the contribution of biodeposits to the carbon flux was overall higher compared to that of biodeposits to sediment TOC, indicating a loss of biodeposits from deposition to storage in the sediment. This study highlights the role clam farming plays in the dynamics of organic carbon by linking vertical fluxes with sediment TOC, which addresses the current knowledge gaps related to the carbon footprint in coastal bivalve aquaculture systems.

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Influence of sedimentary organic matter sources on the distribution characteristics and preservation status of organic carbon, nitrogen, phosphorus, and biogenic silica in the Daya Bay, northern South China Sea

Cited by 26 publications

References 108 publications

GIS Analysis of spatial-temporal variation of the ecological risk caused by element and organic pollutants in Lake Marmara (TURKIYE)

GIS Analysis of spatial-temporal variation of the ecological risk caused by element and organic pollutants in Lake Marmara (TURKIYE)

Vertical distribution of Fe, P and correlation with organic carbon in coastal sediments of Yellow Sea, Eastern China

Vacuum Effect: A Redistribution Process of Organic Carbon Mediated by Bivalve Farming

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