Interactive effects of MnO2, organic matter and pH on abiotic formation of N2O from hydroxylamine in artificial soil mixtures

Liu, Shurong; Berns, Anne E.; Vereecken, Harry; Wu, Di; Brüggemann, Nicolas

doi:10.1038/srep39590

Cited by 21 publications

(19 citation statements)

References 40 publications

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“…Compared to microbes that mineralize N, denitrifiers are more narrowly distributed phylogenetically (Schimel & Schaeffer, ) and require wetter conditions to maintain metabolic activity (e.g., Lennon et al, ). Our results are consistent with studies reporting low N 2 O emissions in drylands except during short periods following precipitation pulses when soils wet up (Soper, Boutton, et al, ; Soper, Groffman, & Sparks, ) or when fast chemical reactions may occur (Heil et al, ; Liu et al, ).…”

Section: Discussionsupporting

confidence: 92%

Effects of Drought Manipulation on Soil Nitrogen Cycling: A Meta‐Analysis

et al. 2017

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Many regions on Earth are expected to become drier with climate change, which may impact nitrogen (N) cycling rates and availability. We used a meta‐analytical approach on the results of field experiments that reduced precipitation and measured N supply (i.e., indices of N mineralization), soil microbial biomass, inorganic N pools (ammonium (NH4+) and nitrate (NO3−)), and nitrous oxide (N2O) emissions. We hypothesized that N supply and N2O emissions would be relatively insensitive to precipitation reduction and that reducing precipitation would increase extractable NH4+ and NO3− concentrations because microbial processes continue, whereas plant N uptake diminishes with drought. In support of this hypothesis, extractable NH4+ increased by 25% overall with precipitation reduction; NH4+ also increased significantly with increasing magnitude of precipitation reduction. In contrast, N supply and extractable NO3− did not change and N2O emissions decreased with reduced precipitation. Across studies microbial biomass appeared unchanged, yet from the diversity of studies, it was clear that proportionally smaller precipitation reductions increased microbial biomass, whereas larger proportional reductions in rainfall reduced microbial biomass; there was a positive intercept (P = 0.005) and a significant negative slope (P = 0.0002) for the regression of microbial biomass versus % precipitation reduction (LnR = −0.009 × (% precipitation reduction) + 0.4021). Our analyses imply that relative to other N variables, N supply is less sensitive to reduced precipitation, whereas processes producing N2O decline. Drought intensity and duration, through sustained N supply, may control how much N becomes vulnerable to loss via hydrologic and gaseous pathways upon rewetting dry soils.

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Section: Discussionsupporting

confidence: 92%

Effects of Drought Manipulation on Soil Nitrogen Cycling: A Meta‐Analysis

et al. 2017

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“…, Liu et al. ). Hence, physicochemical abiotic parameters might play an important role in retaining or processing NO 3 − in the upper soil layer, and the in situ 15 N tracing method is not able to differentiate between biotic or abiotic NO 3 − immobilization or processing.…”

Section: Discussionmentioning

confidence: 99%

“…, Liu et al. ), in which case denitrification would be partly decoupled from biological activity; but further observations are needed to assess this. Altogether, developing novel methods to measure N 2 in situ is vital to understand both the N balance of tropical forests and to gain insight in the driving factors behind N 2 O:N 2 partitioning during nitrification and (chemo) denitrification.…”

Section: Discussionmentioning

confidence: 99%

“…Nitrogen addition experiments in old-growth N-rich forests have shown that abiotic sorption of NO 3 À plays an important role in dampening the expected NO 3 À hydrological losses (Lohse and Matson 2005). Additionally, there is an increasing awareness about abiotic conversion of nitrification intermediates to gaseous N in conditions of low pH and high Mn or Fe content, which might be an important unaccounted abiotic loss pathway (Heil et al 2016, Liu et al 2017).…”

Section: Comparing Lowland and Montane Mixed Forest (Lmf Vs Mmf)mentioning

confidence: 99%

“…Several processes might play a role for N 2 losses, including ammonium oxidation coupled to nitrite reduction (anammox; Xi et al 2016). In specific for these sites, however, it seems more likely that ammonium oxidation coupled to iron reduction (i.e., Feammox) or other forms of chemo-denitrification play an important role in soils with high Fe content (Yang et al 2012, Xi et al 2016) and low pH (Heil et al 2016, Liu et al 2017, in which case denitrification would be partly decoupled from biological activity; but further observations are needed to assess this. Altogether, developing novel methods to measure N 2 in situ is vital to understand both the N balance of tropical forests and to gain insight in the driving factors behind N 2 O:N 2 partitioning during nitrification and (chemo) denitrification.…”

Section: Nitrogen Budget For African Tropical Forestsmentioning

confidence: 99%

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Contrasting nitrogen fluxes in African tropical forests of the Congo Basin

Bauters

Verbeeck

Rütting

et al. 2019

Ecological Monographs

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The observation of high losses of bioavailable nitrogen (N) and N richness in tropical forests is paradoxical with an apparent lack of N input. Hence, the current concept asserts that biological nitrogen fixation (BNF) must be a major N input for tropical forests. However, well‐characterized N cycles are rare and geographically biased; organic N compounds are often neglected and soil gross N cycling is not well quantified. We conducted comprehensive N input and output measurements in four tropical forest types of the Congo Basin with contrasting biotic (mycorrhizal association) and abiotic (lowland–highland) environments. In 12 standardized setups, we monitored N deposition, throughfall, litterfall, leaching, and export during one hydrological year and completed this empirical N budget with nitrous oxide (N2O) flux measurement campaigns in both wet and dry season and in situ gross soil N transformations using 15N‐tracing and numerical modeling. We found that all forests showed a very tight soil N cycle, with gross mineralization to immobilization ratios (M/I) close to 1 and relatively low gross nitrification to mineralization ratios (N/M). This was in line with the observation of dissolved organic nitrogen (DON) dominating N losses for the most abundant, arbuscular mycorrhizal associated, lowland forest type, but in contrast with high losses of dissolved inorganic nitrogen (DIN) in all other forest types. Altogether, our observations show that different forest types in central Africa exhibit N fluxes of contrasting magnitudes and N‐species composition. In contrast to many Neotropical forests, our estimated N budgets of central African forests are imbalanced by a higher N input than output, with organic N contributing significantly to the input‐output balance. This suggests that important other losses that are unaccounted for (e.g., NOx and N2 as well as particulate N) might play a major role in the N cycle of mature African tropical forests.

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Improving nitrogen retention of cattle slurry with oxidized biochar: An incubation study with three different soils

et al. 2022

Self Cite

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The application of livestock slurry in soils can lead to nitrogen (N) losses through ammonia (NH3) emission or nitrate (NO3−) leaching. Oxidized biochar has great potential to mitigate N losses due to its strong adsorption capacity; however, the effects of oxidized biochar in different soils treated with slurry are currently unclear. Here, we investigated the effect of untreated and oxidized biochar (applied at a rate of 50 kg C m−3 slurry) on reducing N losses in a laboratory experiment with three different soils (loamy sand, sandy loam, loam) amended with cattle slurry at an application rate of 73 kg N ha−1. Oxidized biochar reduced NH3 emissions by 64–75% in all soils, whereas untreated biochar reduced NH3 emissions by 61% only in the loamy sand. Oxidized biochar significantly reduced the NO3− content in the soil solution of the loamy sand in the early phase of the incubation and led to a significantly higher NO3− concentration in the same soil compared with the slurry‐only treatment at the end of the experiment, indicating a significant increase in NO3− retention in this organic C–poor soil. We conclude that oxidized biochar can reduce N losses, both in the form of NH3 emission and NO3− leaching, from cattle slurry applied to soil, particularly in soil with soil organic carbon content <1% and pH <5 (i.e., oxidized biochar can serve as a means for improving the quality of marginal and acidic soils).

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Interactive effects of MnO2, organic matter and pH on abiotic formation of N2O from hydroxylamine in artificial soil mixtures

Cited by 21 publications

References 40 publications

Effects of Drought Manipulation on Soil Nitrogen Cycling: A Meta‐Analysis

Effects of Drought Manipulation on Soil Nitrogen Cycling: A Meta‐Analysis

Contrasting nitrogen fluxes in African tropical forests of the Congo Basin

Improving nitrogen retention of cattle slurry with oxidized biochar: An incubation study with three different soils

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