N2O accumulation in estuarine and coastal sediments: The influence of H2S on dissimilatory nitrate reduction

Senga, Yukiko; Mochida, Kazuo; Fukumori, Ryouko; Okamoto, Norihisa; Seike, Yasushi

doi:10.1016/j.ecss.2005.11.021

Cited by 112 publications

(76 citation statements)

References 40 publications

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“…The N 2 O concentrations decrease rapidly as the system turns sulphate reducing. This indicates that the observed high concentrations cannot be due to inhibition of N 2 O reductase activity by H 2 S (Senga et al, 2006). The oxygen concentrations are too low for nitrification to occur in these waters, leaving denitrification as the principal pathway of N 2 O production.…”

Section: Nitrous Oxide Cyclingmentioning

confidence: 94%

Coastal versus open-ocean denitrification in the Arabian Sea

Naqvi

Naik²,

Pratihary³

et al. 2006

Biogeosciences

161

132

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Abstract. The Arabian Sea contains one of the three major open-ocean denitrification zones in the world. In addition, pelagic denitrification also occurs over the inner and midshelf off the west coast of India. The major differences between the two environments are highlighted using the available data. The perennial open-ocean system occupies two orders of magnitude larger volume than the seasonal coastal system, however, the latter offers more extreme conditions (greater nitrate consumption leading to complete anoxia). Unlike the open-ocean system, the coastal system seems to have undergone a change (i.e., it has intensified) over the past few decades presumably due to enhanced nutrient loading from land. The two systems also differ from each other with regard to the modes of nitrous oxide (N 2 O) production: In the open-ocean suboxic zone, an accumulation of secondary nitrite (NO

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Section: Nitrous Oxide Cyclingmentioning

confidence: 94%

Coastal versus open-ocean denitrification in the Arabian Sea

Naqvi

Naik²,

Pratihary³

et al. 2006

Biogeosciences

161

132

View full text Add to dashboard Cite

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“…Which microbial N 2 O formation process dominates is largely controlled by soil geochemical conditions (Braker and Conrad, 2011). In temperate, arable soils major determinants of microbial N 2 O formation are oxygen partial pressure, pH, H 2 S concentration and the availability and speciation of nitrogen and organic carbon (Blackmer and Bremner, 1978;Sorensen et al, 1980;Stevens et al, 1998;Senga et al, 2006;Wallenstein et al, 2006;Baggs et al, 2010;Cuhel et al, 2010;Braker and Conrad, 2011;Philippot et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Linking N2O emissions from biochar-amended soil to the structure and function of the N-cycling microbial community

Harter¹,

Krause²,

Schuettler³

et al. 2013

The ISME Journal

540

258

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Nitrous oxide (N 2 O) contributes 8% to global greenhouse gas emissions. Agricultural sources represent about 60% of anthropogenic N 2 O emissions. Most agricultural N 2 O emissions are due to increased fertilizer application. A considerable fraction of nitrogen fertilizers are converted to N 2 O by microbiological processes (that is, nitrification and denitrification). Soil amended with biochar (charcoal created by pyrolysis of biomass) has been demonstrated to increase crop yield, improve soil quality and affect greenhouse gas emissions, for example, reduce N 2 O emissions. Despite several studies on variations in the general microbial community structure due to soil biochar amendment, hitherto the specific role of the nitrogen cycling microbial community in mitigating soil N 2 O emissions has not been subject of systematic investigation. We performed a microcosm study with a water-saturated soil amended with different amounts (0%, 2% and 10% (w/w)) of high-temperature biochar. By quantifying the abundance and activity of functional marker genes of microbial nitrogen fixation (nifH), nitrification (amoA) and denitrification (nirK, nirS and nosZ) using quantitative PCR we found that biochar addition enhanced microbial nitrous oxide reduction and increased the abundance of microorganisms capable of N 2 -fixation. Soil biochar amendment increased the relative gene and transcript copy numbers of the nosZ-encoded bacterial N 2 O reductase, suggesting a mechanistic link to the observed reduction in N 2 O emissions. Our findings contribute to a better understanding of the impact of biochar on the nitrogen cycling microbial community and the consequences of soil biochar amendment for microbial nitrogen transformation processes and N 2 O emissions from soil.

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“…Also, few studies (Smith and Zimmerman, 1981;Fazzolari et al, 1990;Senga et al, 2006) indicate that N 2 O is produced through dissimilatory NO 3 -reduction to NH 4 + . The current atmospheric concentration of N 2 O is about 310 ppb (by volume), and it is increasing at a rate of 0.6-0.9 ppb·yr -1 (Prinn et al, 1990).…”

Section: Figurementioning

confidence: 99%

“…and Vibrio sps. that are known to reduced NO 3 -to N 2 O (Senga et al, 2006). Nitrate reductase plays a role in NO 3 -assimilation of plants, and some bacteria and fungi, as well as plant mediated denitrification could be responsible for the high N removal efficiency in constructed wetlands (Cottingham et al, 1999).…”

Section: Figurementioning

confidence: 99%

A preliminary study on estimating extra-cellular nitrate reductase activities in estuarine systems

Pant

2009

Knowl. Managt. Aquatic Ecosyst.

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Enzymes catalyzing ammonium (NH 4 + )/nitrate (NO 3 -) into nitrous oxide (N 2 O)/molecular nitrogen (N 2 ), play critical roles in water quality management. The objective of this paper was to investigate the role of extra-cellular enzymes in cycling of nitrogen (N) in aquatic systems. It appears that N in estuaries, salt marshes, etc., does not stay long enough to be available for uptake, thus, creating N limited conditions. This study showed that indigenous extra-cellular nitrate reductase along with others involved in N transformations in the waters/sediments of estuarine systems can cause complete removal of NH 4 + and NO 3 -from the waters and available NH 4 + and NO 3 -from the sediments. These results indicate that due to high extracellular nitrate reductase and other enzymes associated with N transformations in sediments/waters, substantial amounts of NH 4 + and NO 3 -can be quickly lost from the systems as N 2 O and/or nitric oxide (NO), in turn, creating N limited conditions in estuarine systems. Such high activities of indigenous nitrate reductase and others are useful in removing readily bioavailable N from the systems, thereby avoidance of eutrophic conditions. However, they might contribute in increasing the N 2 O, a potent greenhouse gas with global warming potential (GWP) of 296, in the atmosphere. RÉSUMÉ Une étude préliminaire d'estimation des activités nitrate réductase dans des systèmes estuariensLes enzymes catalysant les réactions ammonium (NH 4 + )/nitrate (NO 3 -) en oxyde nitreux (N 2 O)/molécule d'azote (N 2 ) jouent un rôle important dans la gestion de la qualité de l'eau. L'objectif de cet article est d'explorer le rôle des enzymes extracellulaires dans le cycle de l'azote (N) des écosystèmes aquatiques. Il apparaît que l'azote dans les estuaires, les marais salants, etc., ne reste pas assez longtemps pour être biodisponible, créant ainsi des conditions limitantes en azote. Cette étude montre que la nitrate réductase extracellulaire indigène avec d'autres enzymes impliquées dans les transformations de l'azote dans les sédiments et les eaux de systèmes estuariens peut causer une disparition de NH 4 + et NO 3 -des eaux et du NH 4 + et du NO 3 -des sédiments. Les résultats indiquent qu'en raison des activités extracellulaires en nitrate réductase et autres enzymes associées aux transformations de l'azote, une quantité importante de NH 4 + et NO 3 -peut rapidement quitter les systèmes sous forme de N 2 O et/ou d'oxyde nitrique (NO),

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N2O accumulation in estuarine and coastal sediments: The influence of H2S on dissimilatory nitrate reduction

Cited by 112 publications

References 40 publications

Coastal versus open-ocean denitrification in the Arabian Sea

Coastal versus open-ocean denitrification in the Arabian Sea

Linking N2O emissions from biochar-amended soil to the structure and function of the N-cycling microbial community

A preliminary study on estimating extra-cellular nitrate reductase activities in estuarine systems

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