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Posters

soil-methane-fluxChamber-based Soil Methane Flux Measurement
Poster showing Smart Chamber and LI-7810 CH4/CO2/H2O analyzer methane flux data, presented at AGU 2018.
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accurate-fluxAccurate Soil CO2 Flux Measurement at High Spatial and Temporal Resolution
Using an automated 16-chamber system to satisfy spatial and temporal sampling requirements.
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spatial-varSpatial Variability of Soil CO2 Flux in a Cornfield
In and between row comparison of soil CO2 flux.
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Application Notes

flask
Capturing and Processing Soil GHG Fluxes Using the LI-8100A

Describes how to interface third party gas analyzers with the LI-8100Ato measure trace gases, and use SoilFluxPro™ to compute fluxes for these additional gases.

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flask
8100-401 Chamber
Control Kit

Using LI-COR automated soil gas flux chambers with a custom interface.

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flask
Measurement of CO2 Evolution in a Multiplexed Flask System

Uses the LI-8100/
8150 System to rapidly measure CO2 fluxes from multiple samples and has the ability to track fluxes over long time courses.

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spatial-var-readings
Addressing Spatial Variability: Determining the Number of Readings Required

Accounting for the variability of soils and determining the number of readings necessary for accurate measurements.

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powering
Powering the LI-8100/8150 in a Remote Location: Power Requirements and Solar Panel Solution

Powering the LI-8100/8150 "off grid" in remote locations with a solar panel

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air-samples
Using the LI-8100 System to Collect Air Samples for Estimating Soil Trace Gas Flux

Use LI-8100 to Sample Soil Trace Gas FluxAir samples can be collected from the same air stream used to measure soil CO2 flux.
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atmos-profile
Atmospheric CO2 Profile Measurements Using the LI-8100/ 8150 System

In a multiplexed system, atmospheric CO2 profile measurements can be performed, in addition to soil CO2 flux measurements, with minimal added cost.

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6400-8100-comp
Comparisons Between the LI-COR LI-6400 and LI-8100

The theory underlying the two systems is outlined with a comparison of results obtained using each system.

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Frequently Asked Questions

Q What is the importance of measuring spatial and temporal variability?

A The physical properties associated with soil gas fluxes are highly variable. In addition to spatial heterogeneity, the processes that produce gases in soil are coupled to changes in soil water content, temperature, soil organic carbon resources, and more, and therefore exhibit both diurnal and seasonal patterns of variation in evolution. To accurately characterize fluxes of gases from soil at larger scales, it is often necessary to take readings with adequate spatial as well as temporal resolution. For more information, refer to the application note.

Q Can you measure gas diffusion from an isolated source of biomass?

A LI-COR soil gas flux systems are designed to measure gas diffusion directly out of the soil; however, they have the ability to measure gas evolution in flasks containing isolated samples such as fruits, insects, nuts, and more. The LI-8100A, for example, could be used to measure CO2 diffusion from an isolated source of biomass placed in a flask, or the LI-8100A or Smart Chamber could measure the biomass naturally in the outside environment by separating the soil from the biomass. In the outside application, one could simply place the biomass inside a sealed collar and perform a simple measurement to measure gas diffusion out of the biomass over time.

Q Can I use a survey chamber in a multiplexed configuration?

A No, survey chambers are not designed to work with long-term and multiplexed configurations.

Q How long does it take to take a measurement?

A Measurement length depends on your experiment design and the species of gases you are measuring. Based on our empirical testing, the recommended length for a typical soil CO2 flux measurement is approximately 1-2 minutes. Measurements of other traces gases may require more time in order to accurately characterize the flux.

Q Can you collect trace gas samples with LI-COR instruments?

A LI-COR survey, long-term, and multiplexed systems can be integrated with LI-COR Trace Gas Analyzers and with analyzers not manufactured by LI-COR to calculate fluxes of CH4, N2O, and other trace gases. We also offer the 8100‑664 Trace Gas Sampling Kit, which can be used to collect syringe samples of trace gases for analysis with gas chromatography and other methods. For more details, refer to the application note.

Q Can I measure soil gas fluxes and atmospheric profile measurements with the same system?

A Yes, the LI 8150-16 has up to 16 ports where any combination of chambers and profile ports can be used for both flux and atmospheric profile measurements. For more details, refer to the application note.

References

Thomazini, A., et al. (2014). Spatial Variability of CO2 Emissions from Newly Exposed Paraglacial Soils at a Glacier Retreat Zone on King George Island, Maritime Antarctica. Permafrost and Periglacial Processes 25(4): 233–242.

Troxler, T. J., et al. (2015). Component-specific dynamics of riverine mangrove CO2 efflux in the Florida coastal Everglades. Agricultural and Forest Meteorology.

W. Babel, T. Biermann, H. Coners, E. Falge, E. Seeber, J. Ingrisch, P.-M. Schleuß, T. Gerken, J. Leonbacher, T. Leipold, S. Willinghöfer, K. Schützenmeister, O. Shibistova, L. Becker, S. Hafner, S. Spielvogel, X. Li, X. Xu, Y. Sun, L. Zhang, Y. Yang, Y. Ma, K. Wesche, H.-F. Graf, C. Leuschner, G. Guggenberger, Y. Kuzyakov, G. Miehe, and T. Foken (2014). Pasture degradation modifies the water and carbon cycles of the Tibetan highlands. Biogeosciences, 11, 6633–6656.

On Maintaining Pressure Equilibrium Between a Soil CO2 Flux Chamber and the Ambient Air
A version of this paper was published by AGU (see reference below). Copyright (2006) American Geophysical Union.

Liukang Xu*, Michael D. Furtaw, Rodney A. Madsen, Richard L. Garcia, Daniel J. Anderson, Dayle K. McDermitt, (2006), On Maintaining Pressure Equilibrium Between a Soil CO2 Flux Chamber and the Ambient Air, Journal of Geophysical Research, VOL. 111, D08S10, doi:10.1029/2005JD006435. To view the published open abstract, click here.

Hanson, P.J, Childs, K.W., Wullschleger, S.D., Riggs, J. S., Thomas, W. K., Todd, D. E., and Warren, J. M. (2011), A method for experimental heating of intact soil profiles for application to climate change experiments. Global Change Biology, 17: 1083—1096. doi: 10.1111/j.1365-2486.2010.02221.x

Heinemeyer, A., Di Bene, C., Lloyd, A. R., Tortorella, D., Baxter, R., Huntley, B., Gelsomino, A. and Ineson, P. (2011), Soil respiration: implications of the plant-soil continuum and respiration chamber collar-insertion depth on measurement and modelling of soil CO2 efflux rates in three ecosystems. European Journal of Soil Science, 62: 82—94. doi: 10.1111/j.1365-2389.2010.01331.x

Herbst, Mathias, Friborg, Thomas, Ringgaard, Rasmus, Soegaard, Henrik Catchment-Wide Atmospheric Greenhouse Gas Exchange as Influenced by Land Use Diversity Vadose Zone Journal 2011 10: 67-77