scholarly journals Ammonia-oxidation as an engine to generate nitrous oxide in an intensively managed calcareous Fluvo-aquic soil

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Tao Huang ◽  
Bing Gao ◽  
Xiao-Kang Hu ◽  
Xing Lu ◽  
Reinhard Well ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Ammonia Oxidation ◽  
Intensively Managed

scholarly journals Prediction of nitrous oxide fluxes from managed grassland on peat soil using a simple empirical model

1996 ◽  
Vol 44 (4) ◽  
pp. 339-356 ◽  
Author(s):  
G.L. Velthof ◽  
J.G. Koops ◽  
J.H. Duyzer ◽  
O. Oenema
Keyword(s):  
Nitrous Oxide ◽  
Empirical Model ◽  
Peat Soil ◽  
Flux Chamber ◽  
Mineral N ◽  
Gradient Technique ◽  
N2o Fluxes ◽  
Intensively Managed ◽  
Simple Empirical Model ◽  
Measurement Campaigns

Three measurement campaigns were carried out to answer questions related to the factors controlling variations in nitrous oxide (N2O) fluxes from intensively managed grassland on peat soil, comparison of flux measurements with a closed flux chamber method and a flux gradient technique and the development and testing of a simple empirical model for the estimation of N2O fluxes from intensively managed grassland on peat soils. Fluxes of N2O were measured with 42-48 flux chambers and ranged from less than 0.01 to 6.66 mg N/msuperscript 2 per hr. Fluxes were significantly correlated with denitrification activity (Rsuperscript 2=0.34-0.56). Contents of nitrate (NO3-) and ammonium (NH4+) in the top soil and the water-filled pore space (WFPS) explained 37-77% of the variance in N2O flux. Spatial variability of N2O fluxes was large with coefficients of variation ranging from 101 to 320%. Spatial variability was suggested to be related to distribution of mineral N fertilizer and cattle slurry, urine and dung patches and variations in groundwater level within the field. Average field fluxes obtained with the closed flux chamber method were about a factor 10 larger than those with the flux gradient technique on one measurement day but were similar on two other measurement days. The results of the measurement campaigns were used to derive a simple empirical model including total mineral N content and WFPS. This model was tested using an independent data set, i.e. the results of a monitoring study of two years carried out on two other grassland sites on peat soil. The model reasonably predicted magnitude of and temporal variations in N2O fluxes. It is suggested that a simple empirical model which requires only easily obtainable data such as mineral N content and moisture content, in combination with a few days lasting measurement campaigns, may be a valuable tool to predict N2O fluxes from similar sites.

Observations of Variable Ammonia Oxidation and Nitrous Oxide Flux in a Eutrophic Estuary

2018 ◽  
Vol 42 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Sarah M. Laperriere ◽  
Nicholas J. Nidzieko ◽  
Rebecca J. Fox ◽  
Alexander W. Fisher ◽  
Alyson E. Santoro
Keyword(s):  
Nitrous Oxide ◽  
Ammonia Oxidation ◽  
Nitrous Oxide Flux ◽  
Oxide Flux

scholarly journals Treatment performance, nitrous oxide production and microbial community under low-ammonium wastewater in a CANON process

2017 ◽  
Vol 76 (12) ◽  
pp. 3468-3477 ◽  
Author(s):  
Weixing Mi ◽  
Jianqiang Zhao ◽  
Xiaoqian Ding ◽  
Guanghuan Ge ◽  
Rixiang Zhao
Keyword(s):  
Nitrous Oxide ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Ammonia Oxidation ◽  
Removal Rate ◽  
Biofilm Reactor ◽  
Ammonium Concentration ◽  
Nitrous Oxide Production ◽  
Total Nitrogen Removal ◽  
Canon Process

Abstract To investigate the characteristics of anaerobic ammonia oxidation for treating low-ammonium wastewater, a continuous-flow completely autotrophic nitrogen removal over nitrite (CANON) biofilm reactor was studied. At a temperature of 32 ± 1 °C and a pH between 7.5 and 8.2, two operational experiments were performed: the first one fixed the hydraulic retention time (HRT) at 10 h and gradually reduced the influent ammonium concentrations from 210 to 50 mg L−1; the second one fixed the influent ammonium concentration at 30 mg L−1 and gradually decreased the HRT from 10 to 3 h. The results revealed that the total nitrogen removal efficiency exceeded 80%, with a corresponding total nitrogen removal rate of 0.26 ± 0.01 kg N m−3 d−1 at the final low ammonium concentration of 30 mg L−1. Small amounts of nitrous oxide (N2O) up to 0.015 ± 0.004 kg m−3 d−1 at the ammonium concentration of 210 mg L−1 were produced in the CANON process and decreased with the decrease in the influent ammonium loads. High-throughput pyrosequencing analysis indicated that the dominant functional bacteria ‘Candidatus Kuenenia’ under high influent ammonium levels were gradually succeeded by Armatimonadetes_gp5 under low influent ammonium levels.

What plant functional traits can reduce nitrous oxide emissions from intensively managed grasslands?

2017 ◽  
Vol 24 (1) ◽  
pp. e248-e258 ◽  
Author(s):  
Diego Abalos ◽  
Jan Willem van Groenigen ◽  
Gerlinde B. De Deyn
Keyword(s):  
Nitrous Oxide ◽  
Functional Traits ◽  
Plant Functional Traits ◽  
Nitrous Oxide Emissions ◽  
Intensively Managed
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