How shallow water table conditions affect N2O emissions and associated microbial abundances under different nitrogen fertilisations

Cocco, Elisa; Bertora, Chiara; Squartini, Andrea; Vedove, Gemini Delle; Berti, Antonio; Grignani, Carlo; Lazzaro, Barbara; Morari, Francesco

doi:10.1016/j.agee.2018.03.018

Cited by 16 publications

(12 citation statements)

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“…Indeed, Man fertilization led to a higher contribution of amide I (43%) in SOC-FD that decreased to 28% under shallow water conditions, suggesting enhanced degradation processes at high WFPS values. As previously observed in the same experiment by Cocco et al [25] these conditions might have fostered denitrification processes and, in turn, CO 2 emissions. As a consequence of labile compound degradation, the fraction of aromatic rings increased as a result of their high recalcitrance.…”

Section: Discussionsupporting

confidence: 75%

“…That requirement mainly stems from incomplete data on environmental benefits or hazards related to groundwater influence on soil carbon dynamics and CO 2 emissions. Some studies have been conducted in the area to test the effects of manure fertilization on nitrogen leaching [24] and N 2 O emissions [25]. However, to the best of our knowledge, a gap exists in the evaluation of the short-term effects of anaerobic digestate fertilization on SOC stock and soil CO 2 emission in relation to groundwater depth.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Short-Term Impact of Anaerobic Digestate on Soil C Stock and CO2 Emissions in Shallow Water Table Conditions

et al. 2022

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Anaerobic digestion has been recently proposed as a more sustainable energy supply chain able to strengthen the existing security of supply provisions. Anaerobic digestate (AD) is the by-product of the anaerobic digestion process and presents organic fertilizer characteristics, but its agronomic usage has been hindered by both agronomic and environmental concerns. In this study, the impact of agricultural liquid (LD) and solid (SD) AD and beef manure (Man) was evaluated on some agro-environmental characteristics. First, the AD fractions functional groups were characterized by FT-IR, and then LD and SD performances were evaluated on soil organic carbon (SOC) stock and carbon dioxide (CO2) emissions and compared to beef manure (Man). The fertilizer impact was also considered with the presence or absence of a shallow water table. Results showed that SD increased of ca. 3 t ha−1 the SOC stock in the 0–20 cm soil profile with respect to LD, while it was comparable to Man despite the lower C input (1.7 vs. 8.7 t C ha−1), due to the presence of more stable compounds (e.g., lignin). The CO2 fluxes were affected by both fertilizer type and water table level. In the absence of a water table, the CO2 emissions (5.5 g CO2 m2 d−1) were driven by carbon content and quality in the fertilizer, while the presence of a shallower water table hindered mineralization of stable SOC and, in turn, reduced emissions (4.4 g CO2 m2 d−1). AD can be considered a beneficial solution to both maintain soil fertility and, at the same time, give new insight into a circular economy model, although further investigation on GHG emissions is required.

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Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Assessment of the Short-Term Impact of Anaerobic Digestate on Soil C Stock and CO2 Emissions in Shallow Water Table Conditions

et al. 2022

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“…It is notable that the denitrification process is principally regulated by two key denitrifying bacteria of nirK and nirS genes which can convert NO 2 − -N to NO [6,7]. Agricultural soil, the largest source of N 2 O, has been widely regarded as the main anthropogenic source of greenhouse gases [8,9]. Therefore, improving knowledge of the fundamental processes shaping the community composition of nirK-type and nirS-type denitrifier communities in agricultural soil can help us better understand the effect of global changes on biogeochemical cycles.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, nitrogen form release will directly change soil fertility and the salt content of soil and underground water, thereby affecting the growth of soil microorganisms [17,18]. This may cause significant shifts in the community assembly of bacterial denitrifier communities in agricultural soil [8,19]. Nitrogen application can indirectly affect soil microbial composition by regulating soil properties and filed crops [20], or even directly influence soil microbes [11,17,21].…”

Section: Introductionmentioning

confidence: 99%

Depression of Groundwater Table and Reduced Nitrogen Application Jointly Regulate the Bacterial Composition of nirS-Type and nirK-Type Genes in Agricultural Soil

Bai

et al. 2020

Water

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Despite the known influence of nitrogen fertilization and groundwater conditions on soil microbial communities, the effects of their interactions on bacterial composition of denitrifier communities have been rarely quantified. Therefore, a large lysimeter experiment was conducted to examine how and to what extent groundwater table changes and reduced nitrogen application would influence the bacterial composition of nirK-type and nirS-type genes. The bacterial composition of nirK-type and nirS-type genes were compared at two levels of N input and three groundwater table levels. Our results demonstrated that depression of groundwater table, reduced nitrogen application and their interactions would lead to drastic shifts in the bacterial composition of nirS-type and nirK-type genes. Structural equation models (SEMs) indicated that depression of groundwater table and reduced nitrogen application not only directly altered the species composition of denitrifier bacterial communities, but also indirectly influenced them through regulating soil nutrient and salinity. Furthermore, the variation in soil NO3−–N and electrical conductivity caused by depression of groundwater table and reduced nitrogen application played the most important role in altering the community composition of denitrifier bacterial communities. Together, our findings provide first-hand evidence that depression of groundwater table and reduced nitrogen application jointly regulate the species composition of denitrifier bacterial communities in agricultural soil. We highlight that local environmental conditions such as groundwater table and soil attributes should be taken into account to enrich our knowledge of the impact of nitrogen fertilization on soil denitrifier bacterial communities, or even biogeochemical cycles.

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“…Degassing of N2O generated in the deepest part to the atmosphere is often hindered by 1) the low N2O diffusivity through saturated soil (the diffusion coefficient of N2O in water is around four orders of magnitude smaller than in air), which makes that the larger the water column above a location the lower the amount released to the atmosphere (Heincke and Kaupenjohann, 1999) and 2) the microbial reduction of N2O to N2 during the slow upward diffusion (Jahangir et al, 2012;Jurado et al, 2017;Cocco et al, 2018).…”

Section: Gases Analysismentioning

confidence: 99%

Performance of a field-scale biological permeable reactive barrier for in-situ remediation of nitrate-contaminated groundwater

Gibert

Assal

Devlin

et al. 2019

Science of The Total Environment

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We report the performance of a field-scale permeable reactive barrier (PRB) for the biological treatment of nitrate-contaminated groundwater. The reactive material of the PRB consisted of a mixture of gravel and mulch as a carbon source for denitrifying bacteria. The PRB was equipped with a delivery system that allowed injecting NO3at controlled rates from the surface directly into the up-gradient layer of the PRB. This way, NO3concentration entering the PRB

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How shallow water table conditions affect N2O emissions and associated microbial abundances under different nitrogen fertilisations

Cited by 16 publications

References 50 publications

Assessment of the Short-Term Impact of Anaerobic Digestate on Soil C Stock and CO2 Emissions in Shallow Water Table Conditions

Assessment of the Short-Term Impact of Anaerobic Digestate on Soil C Stock and CO2 Emissions in Shallow Water Table Conditions

Depression of Groundwater Table and Reduced Nitrogen Application Jointly Regulate the Bacterial Composition of nirS-Type and nirK-Type Genes in Agricultural Soil

Performance of a field-scale biological permeable reactive barrier for in-situ remediation of nitrate-contaminated groundwater

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