Characterizing Redox Potential Effects on Greenhouse Gas Emissions Induced by Water‐Level Changes

Wang, Jihuan; Bogena, Heye; Vereecken, Harry; Brüggemann, Nicolas

doi:10.2136/vzj2017.08.0152

Cited by 23 publications

(19 citation statements)

References 71 publications

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“…Based on our O 2 and Eh measurements and the results of previous studies (Rubol et al., 2012; Song et al., 2019; Wang et al., 2018), denitrification will probably occur during Ag‐MAR even in well‐drained soils. This may promote N 2 O emissions as well as prevent NO 3 − leaching to groundwater.…”

Section: Discussionsupporting

confidence: 78%

Natural and forced soil aeration during agricultural managed aquifer recharge

Ganot

Dahlke

2021

Vadose Zone Journal

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One of the suggested approaches to mitigate the chronic groundwater depletion in California is agricultural managed aquifer recharge (Ag-MAR), in which farmland is flooded using excess surface water in order to recharge the underlying aquifer. Successful implementation of Ag-MAR projects requires careful estimation of the soil aeration status, as prolonged saturated conditions in the rhizosphere can damage crops due to O 2 deficiency. We studied the soil aeration status under almond [Prunus dulcis (Mill.) D.A. Webb] trees and cover crops during Ag-MAR at three sites differing in drainage properties. Water application included several cycles (2-7) and flooding durations (27-63 h) that varied according to the soil infiltration capacity at each site. We used O 2 and redox potential as soil aeration quantifiers to test the impact of forced aeration by air-injection compared with natural soil aeration. Results suggest an average increase of up to 2% O 2 at one site, whereas mixed impact was observed at the two other sites. Additionally, no impact on crop yield was observed for one growing season. Results further suggest that natural aeration can support crop O 2 demand during Ag-MAR if flooding duration is controlled according to O 2 depletion rates.In large Ag-MAR projects, forced aeration might be useful to improve local zones of O 2 deficiency, which are expected to occur due to topographic irregularities and spatial variability of drainage properties.

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Section: Discussionsupporting

confidence: 78%

Natural and forced soil aeration during agricultural managed aquifer recharge

Ganot

Dahlke

2021

Vadose Zone Journal

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“…Changes in soil moisture affects soil redox potential, which can significantly alter soil GHG emission rates [43,44]. The effects of soil redox on the emission of GHGs have been extensively studied in natural systems and under controlled environmental conditions [11,[45][46][47][48]; however, soil redox potential was rarely documented during these studies [44]. Both soil redox potential and pH are important parameters that determine the thermodynamic favorability of biotic and abiotic reactions in soils; however, redox conditions are often overlooked particularly in agricultural studies, while soil pH tends to be emphasized and monitored in a majority of studies [49].…”

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confidence: 99%

“…Both soil redox potential and pH are important parameters that determine the thermodynamic favorability of biotic and abiotic reactions in soils; however, redox conditions are often overlooked particularly in agricultural studies, while soil pH tends to be emphasized and monitored in a majority of studies [49]. Changes in soil moisture greatly affect soil redox conditions, increase in soil moisture decreases soil redox potential, which in turn alters the likelihood and rate of GHGs emissions; some studies have shown that the change in redox potential is closely related to N 2 O emission [44]. Studies have demonstrated that anoxic conditions will suppress CO 2 production due to a shift from aerobic to anaerobic microbial respiration, which occurs at a slower rate [50][51][52].…”

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confidence: 99%

Irrigation and Greenhouse Gas Emissions: A Review of Field-Based Studies

et al. 2020

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Irrigation practices can greatly influence greenhouse gas (GHG) emissions because of their control on soil microbial activity and substrate supply. However, the effects of different irrigation management practices, such as flood irrigations versus reduced volume methods, including drip and sprinkler irrigation, on GHG emissions are still poorly understood. Therefore, this review was performed to investigate the effects of different irrigation management strategies on the emission of nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4) by synthesizing existing research that either directly or indirectly examined the effects of at least two irrigation rates on GHG emissions within a single field-based study. Out of thirty-two articles selected for review, reduced irrigation was found to be effective in lowering the rate of CH4 emissions, while flood irrigation had the highest CH4 emission. The rate of CO2 emission increased mostly under low irrigation, and the effect of irrigation strategies on N2O emissions were inconsistent, though a majority of studies reported low N2O emissions in continuously flooded field treatments. The global warming potential (GWP) demonstrated that reduced or water-saving irrigation strategies have the potential to decrease the effect of GHG emissions. In general, GWP was higher for the field that was continuously flooded. The major finding from this review is that optimizing irrigation may help to reduce CH4 emissions and net GWP. However, more field research assessing the effect of varying rates of irrigation on the emission of GHGs from the agricultural field is warranted.

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“…Fluctuations in pore water Fe 2+ concentrations (see Supplemental Figure S3) provide evidence that Fe reduction took place in the columns, at least during some imbibition periods. Furthermore, the initial CO 2 pulse at the start of the drainage periods may additionally reflect the rapid degassing of previously produced CO 2 to the air‐filled pore space created by the lowering of the water table (Oertel, Matschullat, Zurba, Zimmermann, & Erasmi, 2016; Wang et al., 2018). In contrast, decreased CO 2 production during imbibition arises from kinetically and/or thermodynamically constrained C decomposition during O 2 limitation (Keiluweit et al., 2016).…”

Section: Resultsmentioning

confidence: 99%

Carbon turnover and microbial activity in an artificial soil under imposed cyclic drainage and imbibition

Pronk

Mellage

Milojevic

et al. 2020

Vadose Zone Journal

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Water table fluctuations generate temporally and spatially dynamic physicochemical conditions that drive biogeochemical hot spots and hot moments in the vadose zone. However, their role in the cycling of soil C remains poorly known. Here, we present results from unvegetated column experiments filled with 45 cm of artificial soil containing 10% humus, and inoculated with a natural microbial extract. In one series of three replicate columns, five cycles, each consisting of a 4-wk drainage followed by a 4-wk imbibition period, were imposed, whereas in a second series, the water table remained static. Depth-resolved O 2 concentration profiles and headspace CO 2 effluxes were markedly different between the two regimes. In the fluctuating regime, drainage periods yielded 2.5 times greater CO 2 effluxes than imbibition periods. At the end of the experiment, the fluctuating water table columns exhibited a distinct zone of organic C (OC) depletion in the depth interval of 8-20 cm that was not observed under the static regime. Although this zone showed elevated levels of adenosine triphosphate (ATP), the microbial biomass was actually lower than at the corresponding depth interval of the static regime. A vertically stratified microbial community established in all columns that depended on oxygenation with depth. The 16S ribosomal RNA (rRNA) gene analyses showed a slightly higher diversity in the Abbreviations: ATP, adenosine triphosphate; bss, below the soil surface; DIC, dissolved inorganic carbon; DOC, dissolved organic carbon; MBC, microbial biomass carbon; OC, organic carbon; OTU, operational taxonomic unit; rRNA, ribosomal RNA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Characterizing Redox Potential Effects on Greenhouse Gas Emissions Induced by Water‐Level Changes

Cited by 23 publications

References 71 publications

Natural and forced soil aeration during agricultural managed aquifer recharge

Natural and forced soil aeration during agricultural managed aquifer recharge

Irrigation and Greenhouse Gas Emissions: A Review of Field-Based Studies

Carbon turnover and microbial activity in an artificial soil under imposed cyclic drainage and imbibition

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