Formation and Fluxes of Soil Trace Gases

Meredith, Laura; Boye, Kristin; Savage, K. E.; Vargas, Rodrigo

doi:10.3390/soilsystems4020022

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Pulse‐based soil respiration is increasingly recognized as a major component of the global C budget (Barnard et al, 2020) and occurs as a response to multiple interacting processes (Meredith et al, 2020), many of which are shifting with global climate and urbanization drivers. The work presented here consistently ties soil CO 2 emissions to interactive resource limitations at multiple scales, bridging results from mechanistic lab studies (Eberwein et al, 2015; Liang et al, 2015) and observational field studies (Talmon et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Wetting‐induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Andrews

Krichels

Homyak

et al. 2023

Global Change Biology

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Warming-induced changes in precipitation regimes, coupled with anthropogenically enhanced nitrogen (N) deposition, are likely to increase the prevalence, duration, and magnitude of soil respiration pulses following wetting via interactions among temperature and carbon (C) and N availability. Quantifying the importance of these interactive controls on soil respiration is a key challenge as pulses can be

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Section: Discussionmentioning

confidence: 99%

Wetting‐induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Andrews

Krichels

Homyak

et al. 2023

Global Change Biology

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“…Spatially resolved subsurface gas measurements help disentangle the contributions of subsurface microbial processes to the net gas exchange at the soil surface 3 . Multiple, potentially competing, biogeochemical processes occur in soil and depend upon microbial composition, resources, and environmental conditions that are heterogenous on both spatial 4 , 5 and temporal scales 6 – 8 .…”

Section: Introductionmentioning

confidence: 99%

Soil gas probes for monitoring trace gas messengers of microbial activity

Roscioli

Meredith

Shorter

et al. 2021

Sci Rep

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Soil microbes vigorously produce and consume gases that reflect active soil biogeochemical processes. Soil gas measurements are therefore a powerful tool to monitor microbial activity. Yet, the majority of soil gases lack non-disruptive subsurface measurement methods at spatiotemporal scales relevant to microbial processes and soil structure. To address this need, we developed a soil gas sampling system that uses novel diffusive soil probes and sample transfer approaches for high-resolution sampling from discrete subsurface regions. Probe sampling requires transferring soil gas samples to above-ground gas analyzers where concentrations and isotopologues are measured. Obtaining representative soil gas samples has historically required balancing disruption to soil gas composition with measurement frequency and analyzer volume demand. These considerations have limited attempts to quantify trace gas spatial concentration gradients and heterogeneity at scales relevant to the soil microbiome. Here, we describe our new flexible diffusive probe sampling system integrated with a modified, reduced volume trace gas analyzer and demonstrate its application for subsurface monitoring of biogeochemical cycling of nitrous oxide (N2O) and its site-specific isotopologues, methane, carbon dioxide, and nitric oxide in controlled soil columns. The sampling system observed reproducible responses of soil gas concentrations to manipulations of soil nutrients and redox state, providing a new window into the microbial response to these key environmental forcings. Using site-specific N2O isotopologues as indicators of microbial processes, we constrain the dynamics of in situ microbial activity. Unlocking trace gas messengers of microbial activity will complement -omics approaches, challenge subsurface models, and improve understanding of soil heterogeneity to disentangle interactive processes in the subsurface biome.

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“…However, field-scale mass balances are rarely calculated [15]. Complete mass balances are very challenging to obtain in the field, due to the infrastructure required to fully capture leaching [50] and volatilization [51]. Moreover, the high spatial variability in soil arsenic distribution can mask changes in arsenic levels [15,16,36].…”

Section: Introductionmentioning

confidence: 99%

Pteris vittata Arsenic Accumulation Only Partially Explains Soil Arsenic Depletion during Field-Scale Phytoextraction

et al. 2020

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Soil arsenic heterogeneity complicates our understanding of phytoextraction rates during arsenic phytoextraction with Pteris vittata, including in response to rate stimulation with nutrient treatments. In a 58-week arsenic phytoextraction field study, we determined the effects of soil arsenic concentrations, fertilizer application, and mycorrhizal fungi inoculation on P. vittata arsenic uptake rates, soil arsenic depletion, and arsenic soil–plant mass balances. Initial soil arsenic concentrations were positively correlated with arsenic uptake rates. Soil inoculation with mycorrhizal fungus Funneliformis mosseae led to 1.5–2 times higher fern aboveground biomass. Across all treatments, ferns accumulated a mean of 3.6% of the initial soil arsenic, and mean soil arsenic concentrations decreased by up to 44%. At depths of 0–10 cm, arsenic accumulation in P. vittata matched soil arsenic depletion. However, at depths of 0–20 cm, fern arsenic accumulation could not account for 61.5% of the soil arsenic depletion, suggesting that the missing arsenic could have been lost to leaching. A higher fraction of arsenic (III) (12.8–71.5%) in the rhizosphere compared to bulk soils suggests that the rhizosphere is a distinct geochemical environment featuring processes that could solubilize arsenic. To our knowledge, this is the first mass balance relating arsenic accumulation in P. vittata to significant decreases in soil arsenic concentrations under field conditions.

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Formation and Fluxes of Soil Trace Gases

Abstract: Trace gas cycling is an important feature of the soil system [...]

Cited by 3 publications

References 12 publications

Wetting‐induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Wetting‐induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Soil gas probes for monitoring trace gas messengers of microbial activity

Pteris vittata Arsenic Accumulation Only Partially Explains Soil Arsenic Depletion during Field-Scale Phytoextraction

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Formation and Fluxes of Soil Trace Gases

Abstract: Trace gas cycling is an important feature of the soil system [...]

Cited by 3 publications

References 12 publications

Wetting‐induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Wetting‐induced soil CO2 emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Soil gas probes for monitoring trace gas messengers of microbial activity

Pteris vittata Arsenic Accumulation Only Partially Explains Soil Arsenic Depletion during Field-Scale Phytoextraction

Contact Info

Product

Resources

About

Wetting‐induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert

Wetting‐induced soil CO₂ emission pulses are driven by interactions among soil temperature, carbon, and nitrogen limitation in the Colorado Desert