Interactions of manganese with the nitrogen cycle: Alternative pathways to dinitrogen

Luther, George W.; Sundby, Bjørn; Lewis, Brent L.; Brendel, Paul J.; Silverberg, Norman

doi:10.1016/s0016-7037(97)00239-1

Cited by 368 publications

(261 citation statements)

References 32 publications

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“…Euxinic zones would have also excluded nitrate from the water column, because like Fe 2+ , HS -and other reduced sulfur compounds are powerful nitrate reductants (Shao et al, 2010). The same is true for Mn 2+ (Luther et al, 1997), H 2 (Karanasios et al, 2010) and CH 4 (Raghoebarsing et al, 2006). …”

Section: Effects Of Ferruginous Conditions On the Nitrogen Cyclementioning

confidence: 98%

“…Hence free O 2 appears to be a prerequisite for the production of significant amounts of nitrate under neutral to alkaline conditions. MnO 2 may be the only alternative oxidizer that can take NH 4 + to NO 3 -(as well as to NO 2 -and N 2 ) over a wide pH range (Hulth et al, 1999;Luther et al, 1997), but unlike ferric iron, which can be produced by anoxygenic photosynthesizers, MnO 2 requires O 2 itself, and it is not clear if Mn-driven ammonium oxidation actually occurs in marine settings (Thamdrup and Dalsgaard, 2000). The inference of nitrification at any time in Earth"s history therefore implies the presence of at least some appreciable amount of O 2 in surface waters.…”

Section: Nitrogen As a Redox Proxymentioning

confidence: 99%

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The evolution of Earth's biogeochemical nitrogen cycle

Stüeken

Kipp

Koehler

et al. 2016

Earth-Science Reviews

312

287

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Nitrogen is an essential nutrient for all life on Earth and it acts as a major control on biological productivity in the modern ocean. Accurate reconstructions of the evolution of life over the course of the last four billion years therefore demand a better understanding of nitrogen bioavailability and speciation through time. The biogeochemical nitrogen cycle has evidently been closely tied to the redox state of the ocean and atmosphere. Multiple lines of evidence indicate that the Earth"s surface has passed in a non-linear fashion from an anoxic state in the Hadean to an oxic state in the later Phanerozoic. It is therefore likely that the nitrogen cycle has changed markedly over time, with potentially severe implications for the productivity and evolution of the biosphere. Here we compile nitrogen isotope data from the literature and review our current understanding of the evolution of the nitrogen cycle, with particular emphasis on the Precambrian. Combined with recent work on redox conditions, trace metal availability, sulfur and iron cycling on the early Earth, we then use the nitrogen isotope record as a platform to test existing and new hypotheses about biogeochemical pathways that may have controlled nitrogen availability through time. Among other things, we conclude that (a) abiotic nitrogen sources were likely insufficient to sustain a large biosphere, thus favoring an early origin of biological N 2 fixation, (b) evidence of nitrate in the Neoarchean and Paleoproterozoic confirm current views of increasing surface oxygen levels at those times, (c) abundant ferrous iron and sulfide in the midPrecambrian ocean may have affected the speciation and size of the fixed nitrogen reservoir, and (d) nitrate availability alone was not a major driver of eukaryotic evolution.

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Section: Effects Of Ferruginous Conditions On the Nitrogen Cyclementioning

confidence: 98%

Section: Nitrogen As a Redox Proxymentioning

confidence: 99%

The evolution of Earth's biogeochemical nitrogen cycle

Stüeken

Kipp

Koehler

et al. 2016

Earth-Science Reviews

312

287

View full text Add to dashboard Cite

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“…This reduced amount of sulfide near the oxic zone may result in a lower inhibition of nitrification compared with Stn C5. Some studies suggested that manganese oxides could consume the potential pool of available NH 4 + to form N 2 or NO 3 - (Luther et al 1997, Hulth et al 1999, Anschutz et al 2000. However, neither NO 3 -nor Mn 2+ concentrations, required to support nitrification, were measured in significant amount in the anoxic zone of the sediments suggesting that this reaction did not occur.…”

Section: Nitrogen and Sulfur Couplingmentioning

confidence: 99%

“…Nitrification, the bacterially mediated oxidation of ammonium and nitrite to nitrate by oxygen, is the main source of nitrate in marine environments. Several studies have pointed out the occurrence of anaerobic production of nitrate by manganese oxides (Luther et al 1997, Hulth et al 1999, Anschutz et al 2000, Hyacinthe et al 2001. Sediment denitrification can occur just below the oxic-anoxic interface when oxygen is depleted by oxic mineralization (e.g.…”

Section: Abstract: Nitrogen Dynamics · Carbon · Oxygen · Coastal Sedmentioning

confidence: 99%

Coupling of carbon, nitrogen and oxygen cycles in sediments from a Mediterranean lagoon: a seasonal perspective

Dedieu¹,

Gilbert²,

Soetaert³

et al. 2007

Mar. Ecol. Prog. Ser.

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International audienceExperimental data and simulations were used to investigate the seasonal coupling between carbon, nitrogen and oxygen cycles in marine sediments from a eutrophic shallow lagoon in the Mediterranean Sea area. A negative seasonal correlation was observed between oxygen consumption and coupled nitrification–denitrification rates in surface sediments. Elevated values of oxygen consumption rates were reached during warm periods (up to 87.7 mmol m–2 d–1) whereas nitrification and denitrification rates remained close to the lowest rates reported for coastal sediments (values around 0.021 to 0.35 mmol N m–2 d–1 for nitrification and 0.014 to 0.045 mmol N m–2 d–1 for denitrification). A steady-state diagenetic model closely represented the seasonal negative correlation of oxygen uptake, coupled nitrification–denitrification rates, the vertical distribution patterns of pore water oxygen and the solid phase distribution of organic carbon when nitrification inhibition by sulfide was included. Simulation adjusted to field data also highlighted the importance of oxygen penetration depth in the seasonal variation of nitrification. The modelling indicated that anaerobic metabolism was the most significant pathway (65 to 80%) during organic matter mineralization with a clear seasonal increase during warm periods. These warm periods were also characterized by the higher benthic demand of oxygen mostly used to re-oxidize the by-products from anaerobic reactions (from 57 to 82%), the other part being used for carbon mineralization

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“…In anoxic sediment, dissolved oxidants present in pore water are recognised to be actively used by heterotrophic bacteria as terminal electron acceptor for OM oxidation, leading to the reduction of oxidized metals. Partially reduced metal, such as Mn 2+ , can be re-oxidised to MnO 2 by NO 3 -in the absence of oxygen (Luther et al, 1997). Although this abiotic process could contribute to nitrogen cycling, reduced Mn likely played a marginal contribution in measured NO 3 -flux considering low Mn 2+ concentration (0.04-0.08 µmol g -1 ) measured in salt marsh sediment (Table 1) compared to St. Lawrence Estuary surface sediment (13.4-92.8 µmol g -1 ; Anschutz et al, 2000).…”

mentioning

confidence: 99%