Research on Soil Chamber Pressure Published in Journal of Geophysical Research
July 25, 2006
LINCOLN, NEBRASKA - LI-COR Senior Application Scientist Liukang Xu, Ph.D., led a group of LI-COR scientists and engineers in a research effort to examine pressure effects on chamber-based soil CO2 flux measurements. The results of this study were recently published in the Journal of Geophysical Research (JGR), an American Geophysical Union publication.
Findings of the research show that pressure equilibrium between the inside of a soil CO2 flux chamber and the surrounding air outside the chamber must be maintained during a measurement if measured soil CO2 flux is to accurately represent the rate occurring naturally outside the chamber. Many existing chamber designs employ a simple vent tube, which is effective in calm conditions, but can cause negative pressure excursions during windy conditions. This negative pressure condition causes an overestimation of soil CO2 flux rates. A new LI-COR vent design was examined and was found to virtually eliminate negative chamber pressures as a result of windy conditions. Field data was presented which verified this conclusion.
To view the abstract for the JGR article, click here. The full article may be viewed by JGR subscribers; non-subscribers may purchase the article for a fee. For more information on the LI-8100 Automated Soil CO2 Flux System and the new pressure vent design, including other research posters, click here or call a LI-COR representative at 800-447-3576 or (1) 402-467-3576.
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