Measurement of Carbon Dioxide, Methane, Nitrous oxide, and Water Potential in Soil Ecosystems

Brummell, Martin E.; Siciliano, Steven D.

doi:10.1016/b978-0-12-386489-5.00005-1

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…In most cases the gas samples are collected with a syringe, transferred to an airtight container and measured ex situ. However, alternative techniques for continuous in situ measurements of gas concentrations have also been developed. − …”

Section: Introductionmentioning

confidence: 99%

Poly-Use Multi-Level Sampling System for Soil-Gas Transport Analysis in the Vadose Zone

Nauer

Chiri

Schroth

2013

Environ. Sci. Technol.

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Soil-gas turnover is important in the global cycling of greenhouse gases. The analysis of soil-gas profiles provides quantitative information on below-ground turnover and fluxes. We developed a poly-use multi-level sampling system (PMLS) for soil-gas sampling, water-content and temperature measurement with high depth resolution and minimal soil disturbance. It is based on perforated access tubes (ATs) permanently installed in the soil. A multi-level sampler allows extraction of soil-gas samples from 20 locations within 1 m depth, while a capacitance probe is used to measure volumetric water contents. During idle times, the ATs are sealed and can be equipped with temperature sensors. Proof-of-concept experiments in a field lysimeter showed good agreement of soil-gas samples and water-content measurements compared with conventional techniques, while a successfully performed gas-tracer test demonstrated the feasibility of the PMLS to determine soil-gas diffusion coefficients in situ. A field application of the PMLS to quantify oxidation of atmospheric CH4 in a field lysimeter and in the forefield of a receding glacier yielded activity coefficients and soil-atmosphere fluxes well in agreement with previous studies. With numerous options for customization, the presented tool extends the methodological choices to investigate soil-gas transport in the vadose zone.

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Section: Introductionmentioning

confidence: 99%

Poly-Use Multi-Level Sampling System for Soil-Gas Transport Analysis in the Vadose Zone

Nauer

Chiri

Schroth

2013

Environ. Sci. Technol.

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“…Additionally, soil CO 2 fluxes were calculated via Fick's first law of diffusion by multiplying the CO 2 concentration gradients between 5 and 15 cm depth obtained from the soil gas sampling plots with the respective D s (Roland et al, 2015). Prior to the flux calculation, soil CO 2 concentrations in ppm were converted to µmol m −3 by multiplying them by the molar volume of a gas at standard temperature and pressure (0.04462 µmol L −1 ; Brummell and Siciliano, 2011). Soil temperature and soil moisture values at 5 cm depth were obtained from the nearest chamber in the same row type.…”

Section: Soil Diffusivity and Gradient-based Co 2 Flux Calculationmentioning

confidence: 99%

Automation of soil flux chamber measurements: potentials and pitfalls

Görres¹,

Kammann²,

Ceulemans³

2015

Preprint

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Abstract. Recent technological advances have enabled the wider application of automated chambers for soil greenhouse gas (GHG) flux measurements, several of them commercially available. However, only few studies addressed the difficulties and challenges associated with operating these systems. In this contribution we compared two commercial soil GHG chamber systems–the LI-8100A Automated Soil CO2 Flux System and the Greenhouse Gas Monitoring System AGPS. From April 2014 until August 2014, the two systems monitored in parallel soil respiration (SR) fluxes at a recently harvested poplar plantation, which provided a bare field situation directly after the harvest as well as a closed canopy later on. For the bare field situation (15 April–30 June 2014), the cumulated average SR obtained from the unfiltered datasets of the LI-8100A and the AGPS were 520 and 433 g CO2 m−2, respectively. For the closed canopy phase (01 July–31 August 2014), which was characterized by a higher soil moisture content, the cumulated average SR estimates were not significantly different with 507 and 501 g CO2 m−2 for the AGPS and the LI-8100A, respectively. Flux quality control and filtering did not significantly alter the results obtained by the LI-8100A, whereas the AGPS SR estimates were reduced by at least 20 %. The main reasons for the observed differences in the performance of the two systems were (i) a lower data coverage provided by the AGPS due to technical problems; (ii) incomplete headspace mixing in the AGPS chambers; (iii) lateral soil CO2 diffusion below the collars during AGPS chamber measurements; (iv) increased root growth within the LI-8100A collars; and (v) a possible overestimation of nighttime SR fluxes by the LI-8100A. In contrast to the LI-8100A, the AGPS had the gas sample inlets installed inside the collars and not the chambers. This unique design feature enabled for the first time the detection of disturbed chamber measurements during nights with a stratified atmosphere, resulting in unbiased nighttime SR estimates. Thus besides providing high temporal frequency flux data, automated chamber systems offer another possibility to greatly improve our understanding of SR fluxes.

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Bubble Farming: Scalable Microcosms for Diatom Biofuel and the Next Green Revolution

Gordon

Merz

Gurke³

et al. 2019

Diatoms: Fundamentals and Applications

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Measurement of Carbon Dioxide, Methane, Nitrous oxide, and Water Potential in Soil Ecosystems

Cited by 7 publications

References 43 publications

Poly-Use Multi-Level Sampling System for Soil-Gas Transport Analysis in the Vadose Zone

Poly-Use Multi-Level Sampling System for Soil-Gas Transport Analysis in the Vadose Zone

Automation of soil flux chamber measurements: potentials and pitfalls

Bubble Farming: Scalable Microcosms for Diatom Biofuel and the Next Green Revolution

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