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Lecture Series for the LI-8100 Automated Soil CO2 Flux System

This Powerpoint lecture series offers a detailed overview of the LI-8100 system and how it addresses the critical considerations for accurate measurement of soil CO2 flux. Each topic is a short video slideshow, following the outline below. The presentations appear below when clicked, or they can be downloaded in a zip file by clicking the download link under the outline. Durations for each topic are shown in parentheses. Scroll down to the outline to select topics. Each lecture must be clicked from the outline to play.

The lectures in this series were prepared by LI-COR Senior Applications Scientist Liukang Xu. Dr. Xu has been an integral member of the Science and Technology group responsible for developing the LI-8100 System, is a co-inventor of the LI-8100 chamber pressure vent, and has authored several related papers and posters.

Dayle McDermitt, LI-COR Vice President of Environmental Science and Technology, presents the lecture series, with contributions from Senior Applications Analyst Rod Madsen. Dr. McDermitt has published a number of papers on carbon balance and gas exchange measurements and has been an invited speaker at international soil CO2 conferences. He is a co-inventor on several patents related to gas measurement technologies.

Introduction (1:54)
Why do we want to know soil CO2 flux? (4:39)
Techniques for measuring soil CO2 flux (11:13)
Requirements for chamber-based measurement (13:04)
Overview of LI-8100 Automated Soil CO2 Flux System
1. Hardware (5:08)
2. Software (7:55)
Example of a typical measurement (6:01)
What makes the LI-8100 unique?
1. Chamber pressure equilibrium
  1. Improperly vented chamber (10:24)
  2. How to measure the chamber pressure correctly (8:01)
  3. New vent design and its performance (13:36)
2. Data analysis, exponential fit (16:45)
3. Mixing inside the chamber, leak test, and minimize the disturbance to the environment (10:44)
4. CO2 profile measurement with the LI-8150 (8:54)
5. Air sampling with LI-8100 for other soil trace gas flux measurement (4:56)
Comparison of soil CO2 flux measurements with LI-6400 and LI-8100 (22:52)
Reference list (3:11)

Download these lectures (124.5M)