Influence of Spartina and Juncus on saltmarsh sediments. II. Trace element geochemistry

Koretsky, Carla M.; Cuellar, Angel; Haveman, Melanie; Beuving, Lauren; Shattuck, Terri; Wagner, M.

doi:10.1016/j.chemgeo.2008.06.014

Cited by 31 publications

(10 citation statements)

References 87 publications

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“…Dissolved organic Fe(III) is a preferred electron acceptor for Fe(III)-reducing microorganisms, and it accelerated Fe cycling in the vegetated mesocosms because dissolved organic Fe(III) complexes are generally re duced more rapidly than solid-phase Fe(III) minerals (Beckler et al 2015). Although dissolved organic Fe(III) was not measured in our study, relatively high concentrations of dissolved organic Fe(III) have been found in saltmarsh creek sediments in previous studies (Koretsky et al 2008, Jones et al 2011, Beckler et al 2015.…”

Section: Influence Of Plants On Sediment Geochemistrycontrasting

confidence: 45%

Iron dynamics in a subtropical estuarine tidal marsh: effect of season and vegetation

Luo¹,

Huang²,

Tong³

et al. 2017

Mar. Ecol. Prog. Ser.

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Section: Influence Of Plants On Sediment Geochemistrycontrasting

confidence: 45%

Iron dynamics in a subtropical estuarine tidal marsh: effect of season and vegetation

Luo¹,

Huang²,

Tong³

et al. 2017

Mar. Ecol. Prog. Ser.

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“…Macrophytes and benthic macrofauna act together with hydrology to control geochemical exchange in organic-enriched coastal sediments (Aller 1994(Aller , 2001Hansen et al 1996;Kristensen 2002, 2003;Neubauer et al 2005;Hyun et al 2007;Koretsky et al 2008aKoretsky et al , 2008b. In the Ganghwa intertidal sediments, the presence of Suaeda japonica at the VMF had a clear stimulating eVect on C oxidation processes (Figs.…”

Section: Controls Of C Oxidation By Sulfate-and Fe(iii) Reductionmentioning

confidence: 95%

“…The rate of C mineralization and the relative contribution of sulfate-and Fe(III) reduction in C oxidation processes are largely aVected by a number of environmental controls, such as bioturbation, vegetation, frequency of tidal inundation, and geophysical properties of the sediment. Plant roots supply both electron donors for stimulating microbial metabolism and oxygen, which is responsible for the rapid regeneration of various electron acceptors (Hines et al 1989(Hines et al , 1999King and Garey 1999;Neubauer et al 2005;Koretsky et al 2008aKoretsky et al , 2008b. At the same time, macrofaunal burrowing activity profoundly aVects the mineralization of organic matter primarily through sediment reworking that supplies labile organic matter to the subsurface sediment and irrigation that expedites the exchange of solutes between the sediment and overlying water (Aller 1994(Aller , 2001Kristensen 2001;Koretsky et al 2005).…”

Section: Introductionmentioning

confidence: 96%

Rapid organic matter mineralization coupled to iron cycling in intertidal mud flats of the Han River estuary, Yellow Sea

et al. 2009

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Organic matter oxidation represents a transfer of elements to inorganic nutrients that support biological productivity and food web processes. Therefore, quantiWcation of the controls of organic matter mineralization is crucial to understanding the carbon cycle and biogeochemical dynamics in coastal marine environments. We investigated the rates and pathways of anaerobic carbon (C) oxidation in an unvegetated mud Xat (UMF) and a vegetated mud Xat (VMF) of the Ganghwa intertidal zone of the macro-tidal Han River estuary, Yellow Sea. Analyses of geochemical constituents revealed relatively oxidized conditions and high reactive Fe(III) concentrations (40-100 mol cm ¡3 ) in the sediments. A pronounced depth stratiWcation in Fe(III) was observed at the VMF site likely due to the lower number of infaunal burrows along with dense root formation by the macrophytes, Suaeda japonica. Depth-integrated rates of anaerobic C mineralization as well as sulfate-and Fe(III) reduction at the VMF were consistently higher than those at the UMF, likely driven by the dense vegetation that supplied organic C substrates and electron acceptors to the rhizosphere. Sediment inventories revealed that solid Fe(III) was up to 17 times more abundant than pore water sulfate, and direct rate measurements showed that microbial Fe(III) reduction comprised an equal or larger percentage of C oxidation (36-66 %) in comparison to sulfate reduction (36-40 %) at both sites studied. Time-course experiments indicated that sulfate reduction rates were likely underestimated, especially in the VMF rhizosphere, due to the reoxidation of reduced S in the presence of high Fe(III). The high rates of C mineralization suggest that the Ganghwa intertidal mud Xats are a signiWcant sink against the external loading of organic compounds, and organic matter mineralization is enhanced by chemical exchange regulated by extreme tidal Xushing and macro-microorganisms interactions.

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“…Lead Koretsky et al (2008) pointed out that lead, like Zn and Cu, is a chalcophile that forms discrete sulfide phases and may also bind strongly to organic matter. Also carbonates could be an effective sink for lead (Lin 1995).…”

Section: Nickelmentioning

confidence: 99%

“…Redox potential and pH of the sediment-water system are the major factors known to influence the mobility of trace elements in wetlands (DeLaune et al 1998;Koretsky et al 2008). However, in most municipal sewage the pH is around neutral and, therefore, this parameter does not affect mobility and retention of heavy metals in constructed wetland too much.…”

Section: Introductionmentioning

confidence: 98%

Heavy metals in sediments from constructed wetlands treating municipal wastewater

et al. 2010

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Constructed wetlands are commonly used for treatment of municipal sewage. The treatment is usually aimed at removal of organics, suspended solids, nutrients and microbial pollution. The information on removal and fate of heavy metals is very limited. The purpose of this study was to evaluate the amount of sediments and heavy metal concentration in the sediments in filtration beds of seven constructed wetlands with horizontal subsurface flow treating municipal sewage with various length of operation. The results revealed that concentrations of Cd, Ni, Pb, Cu, Cr and Zn in the sediment are mostly comparable with concentrations occurred in natural unpolluted or slightly polluted wetlands. The concentrations are much lower than those found in wetlands impacted with mine drainage waters or wastewater from industrial operations. Concentrations of studied heavy metals exceeded only occasionally limits set by the Czech legislation. However, when heavy metal concentrations are evaluated within the filtration material the concentrations are well below the limits set for soils in the Czech Republic. The results also revealed that concentrations of heavy metals in the sediment do not reflect the time of operation probably due to buildup of sediments from suspended solids contained in wastewaters. However, the sediment mass increases during the course of operation and consequently the metal mass increases as well.

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Influence of Spartina and Juncus on saltmarsh sediments. II. Trace element geochemistry

Cited by 31 publications

References 87 publications

Iron dynamics in a subtropical estuarine tidal marsh: effect of season and vegetation

Iron dynamics in a subtropical estuarine tidal marsh: effect of season and vegetation

Rapid organic matter mineralization coupled to iron cycling in intertidal mud flats of the Han River estuary, Yellow Sea

Heavy metals in sediments from constructed wetlands treating municipal wastewater

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