Effect of increasing oxygen concentration on total denitrification and nitrous oxide release from soil by different bacteria

1985 ◽  
Vol 1 (1) ◽  
pp. 31-38 ◽  
Author(s):  
M. N. I. Abou Seada ◽  
J. C. G. Ottow
Keyword(s):  
Nitrous Oxide ◽  
Oxygen Concentration ◽  
Nitrous Oxide Release

scholarly journals Environmental controls of greenhouse gas release in a restoring peat bog in NW Germany

2008 ◽  
Vol 5 (1) ◽  
pp. 213-242 ◽  
Author(s):  
S. Glatzel ◽  
I. Forbrich ◽  
C. Krüger ◽  
S. Lemke ◽  
G. Gerold
Keyword(s):  
Nitrous Oxide ◽  
Greenhouse Gas ◽  
Nitrogen Deposition ◽  
Stress Factors ◽  
Atmospheric Nitrogen Deposition ◽  
Gas Release ◽  
Atmospheric Nitrogen ◽  
Nw Germany ◽  
Surface Peat ◽  
Nitrous Oxide Release

Abstract. In Central Europe, most bogs have a history of drainage and many of them are currently being restored. Success of restoration as well as greenhouse gas exchange of these bogs is influenced by environmental stress factors as drought and atmospheric nitrogen deposition. We determined the methane and nitrous oxide exchange of sites in the strongly decomposed center and less decomposed edge of the Pietzmoor bog in NW Germany in 2004. Also, we examined the methane and nitrous oxide exchange of mesocosms from the center and edge before, during, and following a drainage experiment as well as carbon dioxide release from disturbed unfertilized and nitrogen fertilized surface peat. In the field, methane fluxes ranged from 0 to 3.8 mg m−2 h−1 and were highest from hollows. Field nitrous oxide fluxes ranged from 0 to 574 μg m−2 h−1 and were elevated at the edge. A large Eriophorum vaginatum tussock showed decreasing nitrous oxide release as the season progressed. Drainage of mesocosms decreased methane release to 0, even during rewetting. There was a tendency for a decrease of nitrous oxide release during drainage and for an increase in nitrous oxide release during rewetting. Nitrogen fertilization did not increase decomposition of surface peat. Our examinations suggest a competition between vascular vegetation and denitrifiers for excess nitrogen. We also provide evidence that the von Post humification index can be used to explain greenhouse gas release from bogs, if the role of vascular vegetation is also considered. An assessment of the greenhouse gas release from nitrogen saturated restoring bogs needs to take into account elevated release from fresh Sphagnum peat as well as from sedges growing on decomposed peat. Given the high atmospheric nitrogen deposition, restoration will not be able to achieve an oligotrophic ecosystem in the short term.

Reductive nitrosylation of nickel(ii) complex by nitric oxide followed by nitrous oxide release

2016 ◽  
Vol 45 (25) ◽  
pp. 10200-10208 ◽  
Author(s):  
Somnath Ghosh ◽  
Hemanta Deka ◽  
Yuvraj B. Dangat ◽  
Soumen Saha ◽  
Kuldeep Gogoi ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Complex Formation ◽  
Subsequent Reaction ◽  
Reductive Nitrosylation ◽  
No Releases ◽  
Nitrous Oxide Release

Ni(ii) complex of bis-(2-ethyl-4-methylimidazol-5-yl)methane in methanol undergoes reductive nitrosylation in presence of NO to afford the corresponding Ni(i)-nitrosyl intermediate. Subsequent reaction with additional NO releases N2O with Ni(ii)-nitrito complex formation.

Effects of oxygen on each step of denitrification on Pseudomonas nautica

1989 ◽  
Vol 35 (11) ◽  
pp. 1061-1064 ◽  
Author(s):  
P. Bonin ◽  
M. Gilewicz ◽  
J. C. Bertrand
Keyword(s):  
Nitrous Oxide ◽  
Nitrate Reductase ◽  
Oxygen Concentration ◽  
Nitrite Reductase ◽  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
A Value ◽  
Nitrite Reductase Activity ◽  
Effect Of Oxygen

Studies on the effect of oxygen on denitrification have shown that denitrification on Pseudomonas nautica 617 can take place in the presence of oxygen. The enzymes associated with denitrification are affected differently with respect to oxygen concentration. Nitrate reductase was less sensitive toward oxygen than nitrite and nitrous oxide reductases. Nitrate reductase activity was completely blocked at an oxygen concentration greater than 4.05 mg/L, compared with 2.15 and 0.25 mg/L for nitrite and nitrous oxide reductases, respectively. After an aerobic–anaerobic shift, nitrate reductase activity remained unchanged whereas the rate of nitrite reductase activity rose to a value only 20% that of the original rate.Key words: denitrification, oxygen, Pseudomonas.

Effects of Heterogeneous Reaction and Slow/Rapid Volatilization Process on N2O Formation During the Combustion of Pulverized Biomass

2011 ◽  
Author(s):  
Yukihiko Okumura ◽  
Hirotatsu Watanabe ◽  
Ken Okazaki
Keyword(s):  
Nitrous Oxide ◽  
Low Temperature ◽  
Oxygen Concentration ◽  
N2o Emission ◽  
No Emission ◽  
N2o Formation ◽  
Emission Level ◽  
Initial Oxygen Concentration ◽  
Initial Oxygen ◽  
Biomass N

The purpose of this study is to clarify the fundamental and general features of N2O formation during the combustion of pulverized biomass under low temperature. First, the effect of various important factors, i.e., volatilization process (i.e., either slow or rapid dispersion), oxygen concentration, and solid-gas reaction on N2O formation were investigated by theoretical analysis. The analysis of the effect of the slow/rapid volatilization process on the formation of nitrous oxide showed that the conversion ratio of biomass-N to N2O increases with the decrease in the dispersion of volatile matter per unit time; it means that biomass-N is effectively converted to N2O during slow volatilization. The analysis of the effect of initial oxygen concentration on the formation of nitrous oxide showed that at low temperature (T = 1100K), the level of N2O emission increases, while that of NO emission decreases, with the decrease in initial oxygen concentration. In other words, there is a trade-off relationship between the formation of NO and that of N2O. With respect to the effect of solid-gas reaction, the gasification reactions between CO2, O2, and C(s) occur simultaneously on the surface of biomass particles during combustion. Further, the N2O emission level increases with the increase in N-content of the biomass, while the NO emission level remains constant during low-temperature combustion.

Nitrous oxide release from arable soil: importance of perennial forage crops

1998 ◽  
Vol 28 (1) ◽  
pp. 36-43 ◽  
Author(s):  
E.-A. Kaiser ◽  
K. Kohrs ◽  
M. Kücke ◽  
E. Schnug ◽  
J. C. Munch ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Arable Soil ◽  
Forage Crops ◽  
Nitrous Oxide Release

scholarly journals Small scale controls of greenhouse gas release under elevated N deposition rates in a restoring peat bog in NW Germany

2008 ◽  
Vol 5 (3) ◽  
pp. 925-935 ◽  
Author(s):  
S. Glatzel ◽  
I. Forbrich ◽  
C. Krüger ◽  
S. Lemke ◽  
G. Gerold
Keyword(s):  
Nitrous Oxide ◽  
Greenhouse Gas ◽  
Nitrogen Deposition ◽  
Stress Factors ◽  
Atmospheric Nitrogen Deposition ◽  
Gas Release ◽  
Atmospheric Nitrogen ◽  
Nw Germany ◽  
Surface Peat ◽  
Nitrous Oxide Release

Abstract. In Central Europe, most bogs have a history of drainage and many of them are currently being restored. Success of restoration as well as greenhouse gas exchange of these bogs is influenced by environmental stress factors as drought and atmospheric nitrogen deposition. We determined the methane and nitrous oxide exchange of sites in the strongly decomposed center and less decomposed edge of the Pietzmoor bog in NW Germany in 2004. Also, we examined the methane and nitrous oxide exchange of mesocosms from the center and edge before, during, and following a drainage experiment as well as carbon dioxide release from disturbed unfertilized and nitrogen fertilized surface peat. In the field, methane fluxes ranged from 0 to 3.8 mg m−2 h−1 and were highest from hollows. Field nitrous oxide fluxes ranged from 0 to 574 μg m−2 h−1 and were elevated at the edge. A large Eriophorum vaginatum tussock showed decreasing nitrous oxide release as the season progressed. Drainage of mesocosms decreased methane release to 0, even during rewetting. There was a tendency for a decrease of nitrous oxide release during drainage and for an increase in nitrous oxide release during rewetting. Nitrogen fertilization did not increase decomposition of surface peat. Our examinations suggest a competition between vascular vegetation and denitrifiers for excess nitrogen. We also provide evidence that the von Post humification index can be used to explain nitrous oxide release from bogs, if the role of vascular vegetation is also considered. An assessment of the greenhouse gas release from nitrogen saturated restoring bogs needs to take into account elevated release from fresh Sphagnum peat as well as from sedges growing on decomposed peat. Given the high atmospheric nitrogen deposition, restoration will not be able to achieve an oligotrophic ecosystem in the short term.

Nitrous oxide release from arable soil: Importance of N-fertilization, crops and temporal variation

1998 ◽  
Vol 30 (12) ◽  
pp. 1553-1563 ◽  
Author(s):  
E.-A. Kaiser ◽  
K. Kohrs ◽  
M. Kücke ◽  
E. Schnug ◽  
O. Heinemeyer ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Temporal Variation ◽  
N Fertilization ◽  
Arable Soil ◽  
Nitrous Oxide Release
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