Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

Sheng, Yanqing; Sun, Qiyao; Shi, Wei; Bottrell, Simon H.; Mortimer, Robert J.G.

doi:10.1007/s12665-015-4101-8

Cited by 25 publications

(10 citation statements)

References 36 publications

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“…This suspended sediment contains iron, nitrogen, and other elements, and is potentially important for nutrient accumulation in marine sediment. Previous work and our preliminary study have shown that total iron (Fe), ferrous iron (Fe(II)), ferric iron (Fe(III)), and ammonium (

{N H}_{4}^{+}

‐N) are present in higher concentrations in the coastal marine sediment than in the estuarine sediment of the Yellow River, whereas nitrate (

{N O}_{3}^{-}

‐N) concentration is higher in the estuarine sediment than in the coastal marine sediment. Hence, we hypothesize that the biogeographic distribution of bacterial communities is related to spatial distance, hydrology and environmental variables and that different environmental variables have profound effects on bacterial community structure in different habitats.…”

Section: Introductionmentioning

confidence: 90%

Spatial variation in bacterial community in natural wetland‐river‐sea ecosystems

et al. 2017

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Wetland-estuarine-marine environments are typical oxic/anoxic transition zones and have complex water flow-paths within the zone of mixing where freshwater interacts with ocean water. Little is known about the impact of this interaction on bacterial community structures or the relationship between bacterial community and geochemical factors in such transitional mixing environments. Hence, we investigated the distribution patterns and diversity in bacterial communities in the Yellow River estuary-coastal wetland-Bohai Sea transition zone by analyzing 39 samples from 13 ordered sites. High-throughput sequencing of the 16S rRNA gene revealed significant shifts in diversity and distribution of bacterial community in sediments from the Yellow River estuary to the Bohai Sea. Yellow River sediment was dominated by hydrogen-, nitrogen-, and iron-cycling bacteria, such as Hydrogenophaga, Nitrospira, Pseudomonas, and Thiobacillus. The coastal wetland had a haloduric community associated with different functions, such as Planctomyces, Marinobacter, Halomonas, Salinivibrio, and Salinibacter. The Bohai Sea sediment had a higher relative abundance of Lutimonas, Desulfococcus, Photobacterium, Propionigenium, and Vibrio. Spatial variation in bacterial community was correlated with pH, salinity and sulfate (SO42-) concentration in such coastal environments. The major bacterial taxa were significantly different across the wetland, estuary, and coastal marine ecosystems, indicating substantial spatial heterogeneity among the three ecosystems. Statistical analysis revealed strong links between variation in bacterial community structure and ecosystem type. Our results demonstrate the importance of geographic and geochemical factors in structuring the bacterial community in natural environments.

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{N H}_{4}^{+}

‐N) are present in higher concentrations in the coastal marine sediment than in the estuarine sediment of the Yellow River, whereas nitrate (

{N O}_{3}^{-}

Section: Introductionmentioning

confidence: 90%

Spatial variation in bacterial community in natural wetland‐river‐sea ecosystems

et al. 2017

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“…The fractions of RIS mainly include AVS (fraction of sulfides that are extracted by hydrochloric acid), CRS (pyritic sulfur), and ES (a combination of oxidation products of AVS with O 2 , Fe oxides, and Mn oxides). RIS was conducted using a modified version of the procedure that was described by Sheng et al (2015). AVS, CRS, and ES were separated sequentially by 6 M HCl, acidic Cr(II), and Cr(II) plus N,Ndimethylformamide (DMF), respectively, using pure N 2 as a carrier gas to purge and trap H 2 S at 60 ± 1 °C.…”

Section: Inorganic Sulfur Fractionation Extractionmentioning

confidence: 99%

“…Additionally, sulfides can be reoxidized into elemental S (ES) by Fe(III) (oxyhydr) oxides (FeOOH) under anoxic conditions, thereby inducing chemical Fe reduction and remobilization of previously bound P (FeOOH-P) (Pan et al 2019). After being released into porewater, the reduced Fe(II) can precipitate with the dissolved sulfide as acid volatile sulfur (AVS, FeS) and react with ES to form chromium reducible sulfur (CRS, FeS 2 ) (Sheng et al 2015). The accumulated reductive S and Fe minerals have minimal affinity for P sequestration (Thouvenot-Korppoo et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Acid volatile sulfur and CRS are the primary fractions of RIS in coastal sediments. The ratios of AVS/CRS, the degree of pyritization (DOP), and the degree of sulfurization (DOS) can be used to distinguish whether pyrite and Fe sulfide formation is C-or Fe-limited (Sheng et al 2015) and to identify the completeness of the reaction of RFe with aqueous sulfide (Kraal et al 2013). Previous studies have focused on S-Fe-P coupling under the influence of redox conditions (e.g., tidal inundation and eutrophication) in coastal ecosystems (Sakai et al 2013;Sun et al 2016), but few studies have been conducted on the mechanisms and controlling factors of S-Fe-P under the stresses of high salinity and heavy metals.…”

Section: Introductionmentioning

confidence: 99%

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Coupling mechanisms of S–Fe–P in surface sediments under the stresses of high salinity and heavy metals in coastal rivers

et al. 2021

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Purpose The aim of the study was to (1) investigate the distributions of sulfur (S), iron (Fe), and phosphorus (P) in coastal surface sediments under the stresses of high salinity and heavy metals; (2) identify potential sources and the environmental geochemical process of S-Fe mineral accumulation; and (3) elucidate the coupling mechanisms of S-Fe-P in coastal sediments under environmental stresses. Materials and methodsThe distributions of reduced inorganic sulfur (RIS), inorganic P, and reactive Fe (RFe) in surface sediments in two coastal rivers with heavy metals and high salinity (~50 psu, brine drainage) and in offshore areas in the Bohai Sea were investigated. Results and discussion Pyrite sulfur (CRS) was the predominant fraction of RIS in two rivers (Jiaolai River (JL), 56%; Jiehe River (JH), 72%), whereas acid volatile sulfur (AVS) dominated RIS in their offshore sediments (L, 66%; J, 45%). RFe(II) dominated RFe in JH (70%) and JL (66%), while RFe(III) dominated the fractions in their offshore areas (53%). Coastal surface sediments under the stresses of high salinity and heavy metals were dominated by HCl-P (Ca-bound P) and NaOH-P (Fe-and Albound P), respectively. Conclusions Accumulated Fe sulfide was limited by elemental sulfur (ES) availability under high salinity, while it was limited by total organic carbon (TOC) availability when the river was heavily polluted. High salinity produced sulfide-dominated environments, which could reduce the NaOH-P and facilitate HCl-P immobilization. However, the presence of heavy metals resulted in Fe-dominated environments, which could promote metal sulfides formation and increase the NaOH-P fixation.

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“…It is also has the second largest sediment load flux to the ocean of any river (Poulton and Raiswell 2002;Pan et al 2013). Previous studies (Liu et al 2003;Qiao et al 2007;Gong et al 2015;Sheng et al 2015;Zhang et al 2017) have shown that the concentrations of ferrous iron (Fe(II)), ferric iron (Fe(III)), total iron (Fe), and ammonium (NH 4 + -N) were higher in the coastal marine sediment than in the Yellow River sediment, whereas the concentration of nitrate (NO 3 − -N) was higher in the riverine sediment than in coastal marine sediment. Patterns of IRB abundance and diversity can indicate their contribution to the biogeochemical cycles, while changes in community structures are associated with spatial variations in nutrients [i.e.,NO 3 − -N, NH 4 + -N, Fe(II), Fe(III)] in different habitats.…”

Section: Introductionmentioning

confidence: 95%

The differentiation of iron-reducing bacterial community and iron-reduction activity between riverine and marine sediments in the Yellow River estuary

Zhang

Liu

Zheng

et al. 2019

Mar Life Sci Technol

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Rivers are the primary contributors of iron and other elements to the global oceans. Iron-reducing bacteria play an important biogeochemical role in coupling the iron and carbon redox cycles. However, the extent of changes in community structures and iron-reduction activities of iron-reducing bacteria in riverine and coastal marine sediments remains unclear. This study presents information on the spatial patterns and relative abundance of iron-reducing bacteria in sediments of the Yellow River estuary and the adjacent Bohai Sea. High-throughput sequencing of bacterial 16S rRNA found that the highest relative abundances and diversities were from the estuary (Yellow River-Bohai Sea mixing zone). Pseudomonas, Thiobacillus, Geobacter, Rhodoferax, and Clostridium were the most abundant putative iron-reducing bacteria genera in the sediments of the Yellow River. Vibrio, Shewanella, and Thiobacillus were the most abundant in the sediments of the Bohai Sea. The putative iron-reducing bacterial community was positively correlated with the concentrations of total nitrogen and ammonium in coastal marine sediments, and was significantly correlated with the concentration of nitrate in river sediments. The riverine sediments, with a more diverse iron-reducing bacterial community, exhibited increased activity of Fe(III) reduction in enrichment cultures. The estuary-wide high abundance of putative iron-reducing bacteria suggests that the effect of river-sea interaction on bacterial distribution patterns is high. The results of this study will help the understanding of the biogeochemical cycling of iron in riverine and coastal marine environments. Keywords Iron-reducing bacteria • River • Coastal sea • River-sea interaction Edited by Chengchao Chen.

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Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

Cited by 25 publications

References 36 publications

Spatial variation in bacterial community in natural wetland‐river‐sea ecosystems

Spatial variation in bacterial community in natural wetland‐river‐sea ecosystems

Coupling mechanisms of S–Fe–P in surface sediments under the stresses of high salinity and heavy metals in coastal rivers

The differentiation of iron-reducing bacterial community and iron-reduction activity between riverine and marine sediments in the Yellow River estuary

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