Sulfide-induced dissimilatory nitrate reduction to ammonia in anaerobic freshwater sediments

Brunet, Ramon; Garcia‐Gil, L. J.

doi:10.1111/j.1574-6941.1996.tb00340.x

Cited by 349 publications

(226 citation statements)

References 39 publications

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“…1) led to short turnover times for sulphate (2-5 days), and thus required rapid reoxidation of reduced sulphur species, as observed in other wetlands 10 . This reoxidation may have occurred in the uppermost mm of peat/sediment 24 , which were exposed to oxygenated bottom waters and to the atmosphere by diurnal tides at the site in Georgia, or via anaerobic oxidation coupled to nitrate 25 , oxidized trace metals 26 , humic substances 27 , or nanowires 28 , any of which could serve as electron sinks. Dissolved hydrogen sulphide (HS À ) concentrations were undetectable in Georgia and low (0.3-7.8 mM) in Maine and Florida ( Table 1), suggesting that HS À is either quickly reoxidized or scavenged via precipitation of reduced metal, likely iron 29 sulphides, as Fe oxides are abundant in these wetlands, especially in Georgia (Supplementary Table 2).…”

Section: Resultsmentioning

confidence: 99%

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

et al. 2015

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The role of anaerobic oxidation of methane (AOM) in wetlands, the largest natural source of atmospheric methane, is poorly constrained. Here we report rates of microbially mediated AOM (average rate ¼ 20 nmol cm À 3 per day) in three freshwater wetlands that span multiple biogeographical provinces. The observed AOM rates rival those in marine environments. Most AOM activity may have been coupled to sulphate reduction, but other electron acceptors remain feasible. Lipid biomarkers typically associated with anaerobic methane-oxidizing archaea were more enriched in 13 C than those characteristic of marine systems, potentially due to distinct microbial metabolic pathways or dilution with heterotrophic isotope signals. On the basis of this extensive data set, AOM in freshwater wetlands may consume 200 Tg methane per year, reducing their potential methane emissions by over 50%. These findings challenge precepts surrounding wetland carbon cycling and demonstrate the environmental relevance of an anaerobic methane sink in ecosystems traditionally considered strong methane sources.

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Section: Resultsmentioning

confidence: 99%

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

et al. 2015

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“…Sulfide complexes can act electron donors for nitrogen respiration (e.g., denitrification [Brunet and Garcia-Gil, 1996;Haaijer et al, 2007;Burgin et al, 2012]), and nitrogen retention is high at TOWeR [Ardón et al, 2010], and loss of ammonium is related to salt water inputs at the outflow [Ardón et al, 2013]. Although N cycling is certainly affected by salt water incursion, the degree of connection between nitrogen, sulfur, and iron (e.g., FeS) transformations remains unknown [Burgin and Hamilton, 2007].…”

Section: Salt Water Controls On Iron and Sulfate Reduction Rates And mentioning

confidence: 99%

Iron clad wetlands: Soil iron‐sulfur buffering determines coastal wetland response to salt water incursion

2014

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Coastal freshwater wetland chemistry is rapidly changing due to increased frequency of salt water incursion, a consequence of global change. Seasonal salt water incursion introduces sulfate, which microbially reduces to sulfide. Sulfide binds with reduced iron, producing iron sulfide (FeS), recognizable in wetland soils by its characteristic black color. The objective of this study is to document iron and sulfate reduction rates, as well as product formation (acid volatile sulfide (AVS) and chromium reducible sulfide (CRS)) in a coastal freshwater wetland undergoing seasonal salt water incursion. Understanding iron and sulfur cycling, as well as their reduction products, allows us to calculate the degree of sulfidization (DOS), from which we can estimate how long soil iron will buffer against chemical effects of sea level rise. We show that soil chloride, a direct indicator of the degree of incursion, best predicted iron and sulfate reduction rates. Correlations between soil chloride and iron or sulfur reduction rates were strongest in the surface layer (0-3 cm), indicative of surface water incursion, rather than groundwater intrusion at our site. The interaction between soil moisture and extractable chloride was significantly related to increased AVS, whereas increased soil chloride was a stronger predictor of CRS. The current DOS in this coastal plains wetland is very low, resulting from high soil iron content and relatively small degree of salt water incursion. However, with time and continuous salt water exposure, iron will bind with incoming sulfur, creating FeS complexes, and DOS will increase.

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“…Despite the fact that sulfide can contribute as an electron donor for autotrophic denitrifying bacteria (Cytryn et al, 2005a;Cytryn et al, 2005b;Shao et al, 2010), certain concentrations of sulfide also inhibit the enzymes responsible for denitrification (Brunet and Garcia-Gil, 1996). Slower rates of nitrate reduction under high sulfide (as shown in Fig.…”

Section: Effects Of Sulfide On Nitrate Reductionmentioning

confidence: 99%

“…Since a sulfide-rich environment has been hypothesized to favor DNRA (Brunet and Garcia-Gil, 1996;Sher et al, 2008), the presence of the DNRA process is to be expected in this system and should also be an important pathway for nitrate reduction. Apart from sulfide, the high C/N ratio is another factor that promotes the growth of DNRA bacteria (van Rijn et al, 2006;Schreier et al, 2010).…”

Section: Dnramentioning

confidence: 99%

Denitrification and Dissimilatory Nitrate Reduction to Ammonium (DNRA) Activities in Freshwater Sludge and Biofloc from Nile Tilapia Aquaculture Systems

Chutivisut

Pungrasmi

Powtongsook

2014

J. of Wat. ^|^ Envir. Tech.

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Suspended organic sludge from freshwater and biofloc Nile tilapia systems were examined for the presence of denitrifying and dissimilatory nitrate reduction to ammonium (DNRA) activities under nitrate and sulfide stimulation. Initial nitrate concentrations at 25 and 100 mg NO 3 --N/L were added to the freshwater sludge and biofloc samples to simulate low and high nitrate levels that are normally found in aquaculture systems. The results showed that freshwater sludge and biofloc both had denitrifying activity immediately after nitrate addition. However, ammonium accumulated in the biofloc reactors but not in the freshwater reactors, indicating the activity of DNRA in the high C/N biofloc particles. The influence of sulfide on nitrate reduction was also studied by adding different concentrations of sulfide along with 100 mg NO 3 --N/L. The results showed that elevated sulfide concentrations partially inhibited denitrification in the freshwater sludge and caused nitrite and ammonium accumulation, in which ammonium formation was probably responsible by DNRA activity. In sulfide-added biofloc reactors, ammonium accumulated at the same level as found in the biofloc reactors without sulfide. Therefore, DNRA bacteria residing in the biofloc aquaculture system were more likely to be heterotrophs that did not use sulfide as their electron donor.

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Sulfide-induced dissimilatory nitrate reduction to ammonia in anaerobic freshwater sediments

Cited by 349 publications

References 39 publications

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions

Iron clad wetlands: Soil iron‐sulfur buffering determines coastal wetland response to salt water incursion

Denitrification and Dissimilatory Nitrate Reduction to Ammonium (DNRA) Activities in Freshwater Sludge and Biofloc from Nile Tilapia Aquaculture Systems

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