Soil CO2 Flux Research Presented at AGU

January, 2006

LI-COR presented new research on soil CO2 flux measurements at the American Geophysical Union annual meeting on December 5 – 9, 2005 in San Francisco, California.

Critical Considerations for Accurate Soil CO2 Flux Measurement introduces an automated, multiple-chamber solution to the problem of spatial and temporal variation of FCO2. The poster discusses how improperly designed chamber pressure vents can cause negative pressure excursions during windy conditions (Venturi effect), effectively overestimating FCO2. A new vent design is shown which maintains pressure equilibrium between inside and outside the chamber under calm and windy conditions.

Comparison of Two Systems for Measuring Soil CO2 Flux: the LI-6400 and LI-8100, presents data comparing measurement results with the LI-8100 system and the LI-6400 with 6400-09 Soil CO2 Flux Chamber. These instruments utilize different measurement methods to compensate for a reduced diffusion gradient inherent to the chamber accumulation method. The LI-6400 employs chemical scrubbers in a CO2 drawdown method; the LI-8100 allows CO2 to accumulate in the chamber, but compensates for the reduced gradient by using an exponential fit to the data. Results show that the two instruments gave substantially similar flux rates under the conditions tested.

Click on the title to download a PDF of the poster. For additional information, contact LI-COR .

LI-COR Biosciences is a leader in the design and manufacture of instrument systems for plant biology, biotechnology, and environmental research. LI-COR instruments for photosynthesis, carbon dioxide analysis and light measurement are recognized worldwide for standard-setting innovation in plant science research and environmental monitoring. The company pioneered the development of infrared fluorescence labeling and detection systems for proteomic and genomic research.

Founded in 1971, the privately held company is based in Lincoln, Nebraska, with subsidiaries in Germany and the United Kingdom. LI-COR systems are used in more than 100 countries and are supported by a global network of distributors.

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