Looking back to look ahead: a vision for soil denitrification research

Almaraz, Maya; Wong, Michelle Y.; Yang, Wendy H.

doi:10.1002/ecy.2917

Cited by 46 publications

(51 citation statements)

References 52 publications

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“…Nevertheless, full denitrification is complicated, and might lead to additional N losses in form of N 2 O instead of N 2 . A comprehensive review by Almaraz et al (2020) showed that for a better understanding of how denitrification rates vary across the soil profile, there is a need to more precisely investigate ecosystem N budgets. Therefore, surface and subsoil measurements should be included in future studies to determine controls on denitrification in surface soils vs. subsoils [62].…”

Section: Effects Of Different Field Application Methodsmentioning

confidence: 99%

“…A comprehensive review by Almaraz et al (2020) showed that for a better understanding of how denitrification rates vary across the soil profile, there is a need to more precisely investigate ecosystem N budgets. Therefore, surface and subsoil measurements should be included in future studies to determine controls on denitrification in surface soils vs. subsoils [62]. Fangueiro et al [24] detected no N 2 O emission when slurry material was injected to 30 cm depth.…”

Section: Effects Of Different Field Application Methodsmentioning

confidence: 99%

“…Manure incorporation, with reference to surface application with no incorporation, showed an emission reduction potential for NH 3 of −68% (CI −96, +3), and an increase in N 2 O emissions of +61% (CI −77, +412), highlighting how no-incorporation affected N-dynamics. Infiltration of manure into soil was reduced in no-tillage management compared to a conventional tillage system, where surface exposure to air is minimized, resulting in a better N use efficiency (NUE), due to minimized environmental loss of N [62]. Moreover, urease activity is higher in the topsoil, and manure-soil contact and interaction is optimal, when the manure component is incorporated into the soil [63,64].…”

Section: Effects Of Different Field Application Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Meta-Analysis of Strategies to Reduce NH3 Emissions from Slurries in European Agriculture and Consequences for Greenhouse Gas Emissions

2020

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The intensification of livestock production, to accommodate rising human population, has led to a higher emission of ammonia into the environment. For the reduction of ammonia emissions, different management steps have been reported in most EU countries. Some authors, however, have criticized such individual measures, because attempts to abate the emission of ammonia may lead to significant increases in either methane, nitrous oxide, or carbon dioxide. In this study, we carried out a meta-analysis of experimental European data published in peer-reviewed journals to evaluate the impact of major agricultural management practices on ammonia emissions, including the pollution swapping effect. The result of our meta-analysis showed that for the treatment, storage, and application stages, only slurry acidification was effective for the reduction of ammonia emissions (−69%), and had no pollution swapping effect with other greenhouse gases, like nitrous oxide (−21%), methane (−86%), and carbon dioxide (−15%). All other management strategies, like biological treatment, separation strategies, different storage types, the concealing of the liquid slurry with different materials, and variable field applications were effective to varying degrees for the abatement of ammonia emission, but also resulted in the increased emission of at least one other greenhouse gas. The strategies focusing on the decrease of ammonia emissions neglected the consequences of the emissions of other greenhouse gases. We recommend a combination of treatment technologies, like acidification and soil incorporation, and/or embracing emerging technologies, such as microbial inhibitors and slow release fertilizers.

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Section: Effects Of Different Field Application Methodsmentioning

confidence: 99%

Section: Effects Of Different Field Application Methodsmentioning

confidence: 99%

Section: Effects Of Different Field Application Methodsmentioning

confidence: 99%

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Meta-Analysis of Strategies to Reduce NH3 Emissions from Slurries in European Agriculture and Consequences for Greenhouse Gas Emissions

2020

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“…Denitrification, the microbial-mediated reduction of NO 3 − to di-nitrogen gas (N 2 ) under anaerobic conditions, is globally considered the primary biogeochemical process via which mineral N is returned to the atmosphere [10][11][12]. Whether N is denitrified and lost to atmosphere as N 2 or accumulates in the vadose zone and in groundwater [13,14] makes a huge difference in an environmental perspective and from the point of view of policymakers and stakeholders. Thus, assessing the fate of missing N is a major scientific challenge for defining codes of good agricultural practices and implementing effective management strategies aimed at protecting water quality in human-impacted watersheds.…”

Section: Introductionmentioning

confidence: 99%

In Search for the Missing Nitrogen: Closing the Budget to Assess the Role of Denitrification in Agricultural Watersheds

et al. 2020

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Although representing a paramount mechanism against nitrogen excess in agricultural landscapes, soil denitrification is still a largely unknown term in nitrogen balances at the watershed scale. In the present work, a comprehensive investigation of nitrogen sources and sinks in agricultural soils and waters was performed with the aim of gaining insights into the relevance of soil denitrification in a highly farmed sub-basin of the Po River delta (Northern Italy). Agricultural statistics, water quality datasets, and results of laboratory experiments targeting nitrogen fluxes in soils were combined to set up a detailed nitrogen budget along the terrestrial–freshwater continuum. The soil nitrogen budget was not closed, with inputs exceeding outputs by 72 kg N·ha−1·year−1, highlighting a potential high risk of nitrate contamination. However, extensive monitoring showed a general scarcity of mineral nitrogen forms in both shallow aquifers and soils. The present study confirmed the importance of denitrification, representing ~37% of the total nitrogen inputs, as the leading process of nitrate removal in heavily fertilized fine-texture soils prone to waterlogged conditions.

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“…This allows for comparison of all OM fractions across the different soils. Potential problems of the acetylene inhibition technique, i.e., underestimated N 2 production due to acetylene inhibition of nitrification and incomplete inhibition of N 2 O reduction caused by either low NO 3 − concentrations or acetylene diffusion effects (Knowles, 1990;Almaraz et al, 2020), can be excluded for the incubation conditions used (anoxic, excess NO 3 − , soil suspension).…”

Section: Incubation Gas Measurements and Calculationsmentioning

confidence: 99%

Contribution of Particulate and Mineral-Associated Organic Matter to Potential Denitrification of Agricultural Soils

Surey

Kaiser

Schimpf

et al. 2021

Front. Environ. Sci.

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Water-extractable organic carbon (WEOC) is considered as the most important carbon (C) source for denitrifying organisms, but the contribution of individual organic matter (OM) fractions (i.e., particulate (POM) and mineral-associated (MOM)) to its release and, thus, to denitrification remains unresolved. Here we tested short-time effects of POM and MOM on potential denitrification and estimated the contribution of POM- and MOM-derived WEOC to denitrification and CO2 production of three agricultural topsoils. Suspensions of bulk soils with and without addition of soil-derived POM or MOM were incubated for 24 h under anoxic conditions. Acetylene inhibition was used to determine the potential denitrification and respective product ratio at constant nitrate supply. Normalized to added OC, effects of POM on CO2 production, total denitrification, and its product ratios were much stronger than those of MOM. While the addition of OM generally increased the (N2O + N2)-N/CO2-C ratio, the N2O/(N2O + N2) ratio changed differently depending on the soil. Gas emissions and the respective shares of initial WEOC were then used to estimate the contribution of POM and MOM-derived WEOC to total CO2, N2O, and N2O + N2 production. Water-extractable OC derived from POM accounted for 53–85% of total denitrification and WEOC released from MOM accounted for 15–47%. Total gas emissions from bulk soils were partly over- or underestimated, mainly due to nonproportional responses of denitrification to the addition of individual OM fractions. Our findings show that MOM plays a role in providing organic substrates during denitrification but is generally less dominant than POM. We conclude that the denitrification potential of soils is not predictable based on the C distribution over POM and MOM alone. Instead, the source strength of POM and MOM for WEOC plus the WEOC’s quality turned out as the most decisive determinants of potential denitrification.

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Looking back to look ahead: a vision for soil denitrification research

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 46 publications

References 52 publications

Meta-Analysis of Strategies to Reduce NH3 Emissions from Slurries in European Agriculture and Consequences for Greenhouse Gas Emissions

Meta-Analysis of Strategies to Reduce NH3 Emissions from Slurries in European Agriculture and Consequences for Greenhouse Gas Emissions

In Search for the Missing Nitrogen: Closing the Budget to Assess the Role of Denitrification in Agricultural Watersheds

Contribution of Particulate and Mineral-Associated Organic Matter to Potential Denitrification of Agricultural Soils

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