Nitrous oxide production from nitrification and denitrification in marine sediment at low oxygen concentrations

Jørgensen, Kirsten S.; Jensen, Hanne Bak; Sørensen, Jan

doi:10.1139/m84-167

Cited by 98 publications

(50 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…from ammonium. This conclusion is further corroborated by the observed hypoxic conditions during large parts of all tides, as concentrations of O 2 have been clearly recognized as the key control on N 2 O production by both nitrification and denitrification, especially during high nutrient availability (e.g., Goreau et al 1980;Jørgensen et al 1984;de Bie et al 2002).…”

Section: Discussionmentioning

confidence: 69%

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem ¹⁵ N labeling study

Gribsholt

Boschker²,

Struyf

et al. 2005

Limnol. Oceanogr.

View full text Add to dashboard Cite

We quantified the fate and transport of watershed-derived ammonium in a tidal freshwater marsh fringing the nutrientrich Scheldt River in a whole-ecosystem 15 N labeling experiment. 15 N-NH was added to the floodwater entering a 3,477 ϩ 4 m 2 tidal marsh area, and marsh ammonium processing and retention were traced in six subsequent tide cycles. We present data for the water phase components of the marsh system, in which changes in concentration and isotopic enrichment of NO , NO , N 2 O, N 2 , NH , and suspended particulate nitrogen (SPN) were measured in concert with a mass balancestudy. Simultaneous addition of a conservative tracer (NaBr) confirmed that tracer was evenly distributed, and the Br Ϫ budget was almost closed (115% recovery). All analyzed dissolved and suspended N pools were labeled, and 31% of added for 30% of 15 N-transformation. In situ whole-ecosystem nitrification rates were four to nine times higher than those in the water column alone, implying a crucial role for the large reactive marsh surface area in N-transformation. Under conditions of low oxygen concentrations and high ammonium availability, nitrifiers produced N 2 O. Our results show that tidal freshwater marshes function not only as nutrient sinks but also as nutrient transformers.

show abstract

Section: Discussionmentioning

confidence: 69%

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem ¹⁵ N labeling study

Gribsholt

Boschker²,

Struyf

et al. 2005

Limnol. Oceanogr.

View full text Add to dashboard Cite

show abstract

“…In the estuarine sediments, N 2 O is produced from microbial nitrogen transformations. Generally, three microbial processes can lead to N 2 O production: denitrification (15,22), nitrification (12,15,34,50), and dissimilatory nitrate reduction to ammonium (44). Any factors which affect these processes would indirectly affect N 2 O production (9,17).…”

Section: Discussionmentioning

confidence: 99%

Nitrous Oxide Formation in the Colne Estuary, England: the Central Role of Nitrite

Dong

Nedwell

Underwood

et al. 2002

Appl Environ Microbiol

View full text Add to dashboard Cite

Nitrate and nitrite concentrations in the water and nitrous oxide and nitrite fluxes across the sediment-water interface were measured monthly in the River Colne estuary, England, from December 1996 to March 1998. Water column concentrations of N 2 O in the Colne were supersaturated with respect to air, indicating that the estuary was a source of N 2 O for the atmosphere. At the freshwater end of the estuary, nitrous oxide effluxes from the sediment were closely correlated with the nitrite concentrations in the overlying water and with the nitrite influx into the sediment. Increases in N 2 O production from sediments were about 10 times greater with the addition of nitrite than with the addition of nitrate. Rates of denitrification were stimulated to a larger extent by enhanced nitrite than by nitrate concentrations. At 550 M nitrite or nitrate (the highest concentration used), the rates of denitrification were 600 mol N · m ؊2 · h ؊1 with nitrite but only 180 mol N · m ؊2· h ؊1 with nitrate. The ratios of rates of nitrous oxide production and denitrification (N 2 O/N 2 ؋ 100) were significantly higher with the addition of nitrite (7 to 13% of denitrification) than with nitrate (2 to 4% of denitrification). The results suggested that in addition to anaerobic bacteria, which possess the complete denitrification pathway for N 2 formation in the estuarine sediments, there may be two other groups of bacteria: nitrite denitrifiers, which reduce nitrite to N 2 via N 2 O, and obligate nitrite-denitrifying bacteria, which reduce nitrite to N 2 O as the end product. Consideration of free-energy changes during N 2 O formation led to the conclusion that N 2 O formation using nitrite as the electron acceptor is favored in the Colne estuary and may be a critical factor regulating the formation of N 2 O in high-nutrient-load estuaries.Nitrous oxide (N 2 O) is, after molecular nitrogen, the most abundant nitrogen compound in the atmosphere. Global longterm measurement series of tropospheric N 2 O show an annual growth rate of about 0.25 to 0.31% year Ϫ1 (18, 48), indicating that current global sources exceed sinks (4). Nitrous oxide has an atmospheric lifetime of about 150 years and a large greenhouse warming potential (36). When century-long effects are considered, the greenhouse warming potential of N 2 O is 310 times greater than that of CO 2 (1).According to Mathews (26), known global sinks exceed known sources by 40%, which implies either the presence of unknown sources of N 2 O or the underestimation of alreadyknown sources. Generally, global budgets do not include estimates of sources of N 2 O in estuaries and coastal seas. A recent study (2), however, showed that when estuarine and coastal regions were included, a considerable portion (approximately 60%) of the global marine N 2 O flux was from estuarine and coastal regions, mainly due to high emission from estuaries. High N 2 O concentrations and high fluxes to the atmosphere have been described in some estuaries and coastal seas (2,3,6,14,19,24,27,28,35,39,40,41,42,4...

show abstract

“…1) in the ridge as it did in the runnel (Table 2). The specific role of O2 on the nitrification is difficult to assess: It was found earlier that the microbial oxidation of NH,' stops at O2 concentrations between 1.1 and 6.2 pM (Jsrgensen et al 1984) and that the process is inhibited between 2 to 3 times air saturation in a n estuarine environment (Henriksen & Kemp 1988). Kemp et al (1990) found that nitrification was absent when O2 concentrations in the overlying water declined below 125 pM and sediments were anoxic.…”

Section: Resultsmentioning

confidence: 99%

Nitrification rates related to sedimentary structures in an Atlantic intertidal mudflat, Marennes-Oléron Bay, France

Laima¹,

Girard²,

Vouvé³

et al. 1999

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Rates of actual nitrification through acetylene blockage of NH,' oxidation and potential nitnfication were measured in 2 intertidal geomorphological structures, 'ridges and runnels', at Marennes-Oleron Bay, France. Nitrification rates were 6 times higher in runnels as compared to ridges and their O2 gradients with depth were different. Calculated N mineralization rates averaged 1.66 mm01 m-2 d-' in runnels versus 0.29 mm01 m-2 d-' in ridges: Over 7 0 % of this produced NH,' was nitrified and thus became potentially available for denitrification. In neither ridges nor runnels was there a significant correlat~on between potential nitrification and pH, Eh or pore water NH,' (p > 0.05), but the correlation between potent~al nitrification and pore water No3-was signif~cant in runnels (p < 0.05). The presence of nitrifying bacteria below the depth of O2 penetration in sediment suggests that mixing processes have a role in controlling nitrification in this mudflat.

show abstract

Nitrous oxide production from nitrification and denitrification in marine sediment at low oxygen concentrations

Cited by 98 publications

References 12 publications

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem ¹⁵ N labeling study

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem ¹⁵ N labeling study

Nitrous Oxide Formation in the Colne Estuary, England: the Central Role of Nitrite

Nitrification rates related to sedimentary structures in an Atlantic intertidal mudflat, Marennes-Oléron Bay, France

Contact Info

Product

Resources

About

Nitrous oxide production from nitrification and denitrification in marine sediment at low oxygen concentrations

Cited by 98 publications

References 12 publications

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem 15 N labeling study

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem 15 N labeling study

Nitrous Oxide Formation in the Colne Estuary, England: the Central Role of Nitrite

Nitrification rates related to sedimentary structures in an Atlantic intertidal mudflat, Marennes-Oléron Bay, France

Contact Info

Product

Resources

About

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem ¹⁵ N labeling study

Nitrogen processing in a tidal freshwater marsh: A whole-ecosystem ¹⁵ N labeling study