Pathways of soil N2O uptake, consumption, and its driving factors: a review

Liu, Hongshan; Li, Yuefen; Pan, Baobao; Zheng, Xiangzhou; Jian, Yu; Ding, Hong; Zhang, Yushu

doi:10.1007/s11356-022-18619-y

Cited by 23 publications

(14 citation statements)

References 128 publications

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“…In comparison, data for total denitrification reported in the literature is poorly constrained and varies widely across studies, in part due to methodological limitations in quantifying total denitrification rates. In a global synthesis, denitrification rates, defined as N2O+N2 fluxes, were found to range between 0.001 and 20 kg N ha -1 day -1 (Pan et al, 2022). When calculating mean daily gross N2O production in our 144-day experiment, we find rates between 0.03 and 1.06 kg N ha -1 day -1 , well within but on the low end of the range observed in the literature.…”

Section: Gross N2o Production Consumption and N2o:(n2o+n2) Ratiossupporting

confidence: 81%

“…As such, the soil in this experiment behaved, to some extent, as a sink of N2O. While it is generally accepted that soils are net sources of N2O, it is well known that soil can act as a sink under certain conditions (Chapuis-Lardy et al, 2007;Liu et al, 2022). Main direct controls on N2O consumption include microbial community structure, soil oxygen concentrations, forms and concentrations of N sources, residue or other amendments, soil pH, and copper and iodide concentrations (Liu et al 2022).…”

Section: Gross N2o Production Consumption and N2o:(n2o+n2) Ratiosmentioning

confidence: 72%

“…In relation to the potentially available N from fertilizer and initial soil NO3 -, the denitrification loss over the course of the experiment in our study ranged between 1 % and 35 %. Similarly, Pan et al (2022) found that fertilizer N losses from denitrification across studies ranged between 0.5 % and 40%. This range aligns well with findings from N budget studies using 15 N tracers, where the percentage of N that is unaccounted for was on average 38% (Gardner and Drinkwater, 2009).…”

Section: Gross N2o Production Consumption and N2o:(n2o+n2) Ratiosmentioning

confidence: 94%

“…On a global scale, total N2 emissions from denitrification were estimated to range between 67 to 130 million tons N per year, with roughly half of this N removal attributed to agricultural soil (Scheer et al, 2020). Daily gross denitrification rates from soil ranged between 0.001 and 20 kg N ha -1 day -1 across studies, correlating positively to soil water-filled pore space, nitrate (NO3 -) content, and temperature, and negatively with soil oxygen content (Pan et al, 2022). When studying denitrification, potential emissions of the potent greenhouse gas and ozone depleting substance nitrous oxide (N2O) need to be considered (Ipcc, 2013;Ravishankara et al, 2009), as N2O is an intermediate compound formed during the reduction of NO3to N2 by denitrifiers (Zumft, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…In this context, a commonly used metric is the ratio of N2O:(N2O+N2), where a lower ratio indicates a greater importance of gross N2O consumption or total denitrification in an ecosystem (Schlesinger, 2009;Stevens et al, 1998). Ratios of N2O/(N2O+N2) were found to increase with soil oxygen content but decrease with soil organic carbon (C), C:N ratio, soil pH and soil water filled pore space (Pan et al, 2022). Furthermore, total denitrification was shown to not only be affected by the quantity of organic C added or present in the soil, but also its biochemical composition (Henry et al, 2008;Morley and Baggs, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N₂O

Decock

Lee

Barthel

et al. 2022

Preprint

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Abstract. Total denitrification, the natural process capable of removing reactive N from ecosystems through conversion to N2, is one of the most poorly constrained processes in terrestrial N cycling. In situ quantification of total denitrification could help identify mitigation options for N pollution. This study provides proof-of-concept for a novel natural abundance isotope based model for depth differentiated in situ quantification of total denitrification; it does so by examining the use-case of the impact of wheat (Triticum aestivum) varieties with different root biomass on total denitrification. We set up a mesocosm experiment in 1.5 m tall lysimeters with four wheat varieties, each replicated three times. Temporal data for soil moisture, nitrous oxide (N2O) concentrations in the soil pore space, site preference (SP) and δ18O values of soil pore space N2O were collected at soil depths of 7.5, 30, 60, 90 and 120 cm over a five month growing period and used as input variables in the new model. Here, we define total denitrification as gross N2O consumption, with N2O produced either through nitrification or denitrification. The model, further referred to as ‘Process Rate Estimator’ or PRE, constrains temporally explicit gross N2O production and consumption rates at each depth increment based on a combination of diffusion and isotope mixing and fractionation models. Estimated production and consumption of N2O, integrated over the five month experiment, ranged from 3.9 to 170.3 kg N ha-1, with a trend for greater N2O production from denitrification compared to nitrification. N2O concentrations where greatest at 60 and 90 cm depth, while N2O production and consumption peaked at 7.5 and 30 cm depth, illustrating the important role of N2O dynamics along the soil profile in understanding ecosystem N budgets. Both N2O production and consumption were greater in varieties that had previously been characterized to have greater root biomass. We demonstrate that PRE is able to constrain nitrification and denitrification leading to gross daily N2O production, and gross reduction to N2 across the depth profile, based on the temporal change in concentrations, δ18O and SP of N2O. We conclude that our results support the potential of PRE to estimate total denitrification in situ, which could form the basis for developing promising strategies to reduce N pollution.

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Section: Gross N2o Production Consumption and N2o:(n2o+n2) Ratiossupporting

confidence: 81%

Section: Gross N2o Production Consumption and N2o:(n2o+n2) Ratiosmentioning

confidence: 72%

Section: Gross N2o Production Consumption and N2o:(n2o+n2) Ratiosmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N₂O

Decock

Lee

Barthel

et al. 2022

Preprint

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N₂O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils

Wang,

Li,

et al. 2024

Soil Science Soc of Amer J

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Sandy loamy soils are widely distributed in fluvial floodplains and experience flooding events frequently, resulting in a large amount of nitrous oxide (N2O) emissions. This case is more serious when the soil use is changed to paddies. It is of great significance to figure out the N2O consumption and its influencing factors in sandy loamy paddy soils to mitigate N2O emissions. In this study, three sandy loamy paddy soils (0–5 cm) originated from lake deposits were selected (S1, S2, and S3) as objectives. A certain concentration of exogenous N2O was added at the bottom of the flooded soil column to monitor the dynamics of N2O and nitrogen (N2) on the soil surface. Total N2O consumption, N2O uptake, and N2 production were quantified, and the abundance of nitrous oxide reductase genes (nosZI, and nosZII) and other soil properties (ammonium‐nitrogen, nitrate‐nitrogen, and dissolved organic carbon [DOC] content) were analyzed. The results showed that the sandy loamy paddy soil column with a depth of 0–5 cm could intercept more than 95% of the exogenous N2O under the flooded anaerobic condition, indicating that the three sandy loamy paddy soils all had extremely strong N2O consumption capacities. And the increment of N2 accounted for 68.73%–76.09% of the total N2O consumption, which had a stronger relationship with the increase of nosZI gene abundance than nosZII gene. In addition, the total N2O consumption and N2 increment of S1 and S3 soils were significantly higher than those of S2 soil. This difference was mainly related to soil organic matter content, total nitrogen content, DOC consumption, and the increase of nosZI gene abundance (p < 0.05). The strong N2O consumption potential of sandy loamy soils can provide feasible solutions for regulating N2O emissions in a wide range of similar environments in fluvial floodplains.

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Ensifer meliloti denitrification is involved in infection effectiveness and N2O emissions from alfalfa root nodules

et al. 2023

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Purpose Alfalfa is one of the most valuable forage crops in temperate climate zones. Ensifer meliloti, the endosymbiont of alfalfa, contains all the denitrification genes but the capacity of alfalfa root nodules to produce nitrous oxide (N2O) is not known. In this work, N2O emissions as well as the influence of bacteroidal denitrification on nodulation competitiveness and N2O release from alfalfa nodules has been investigated. Methods Medicago sativa cv. Victoria plants were inoculated with E. meliloti 1021, a periplasmic nitrate reductase (Nap) defective mutant, a Nap overexpressing strain and a nitrous oxide reductase defective mutant. Plants were grown in the presence of different nitrate and copper treatments and subjected to flooding during one week before harvesting. N2O production by the nodules was analysed by using gas chromatography. Methyl viologen-dependent nitrate reductase (MV+-NR), nitrite reductase (MV+-NIR) and nitrous oxide reductase (N2OR) enzymatic activities were measured in isolated bacteroids. Results Alfalfa root nodules produce N2O in response to nitrate and flooding. Overexpression of Nap improved nodulation competitiveness and induced N2O emissions from nodules. Copper is required for an effective symbiosis as well as triggered a reduction of N2O production due to the induction of the N2OR and a reduction of NIR activities in the bacteroids. Conclusion Alfalfa root nodules emit N2O. Nap is involved in nodulation competitiveness and in N2O emissions by the nodules. Bacteroidal N2OR and NIR activities are modulated by Cu and may be considered as effective targets for the mitigation strategies of N2O emissions derived from alfalfa crops.

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Pathways of soil N2O uptake, consumption, and its driving factors: a review

Cited by 23 publications

References 128 publications

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N₂O

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N₂O

N₂O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils

Ensifer meliloti denitrification is involved in infection effectiveness and N2O emissions from alfalfa root nodules

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Pathways of soil N2O uptake, consumption, and its driving factors: a review

Cited by 23 publications

References 128 publications

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N2O

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N2O

N2O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils

Ensifer meliloti denitrification is involved in infection effectiveness and N2O emissions from alfalfa root nodules

Contact Info

Product

Resources

About

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N₂O

Process Rate Estimator: A novel model to predict total denitrification using natural abundance stable isotopes of N₂O

N₂O consumption, uptake, and microbial reduction processes in flooded sandy loamy paddy soils