6 Using the 10 and 20
cm Survey Chambers
General Description
The 8100-102 10 cm and 8100-103 20 cm Survey Chambers are designed to make
rapid measurements of soil CO
2
flux that can be repeated over a number of
locations to get an accurate measure of spatial variability.
A pressure/vacuum air flow system expands and contracts a bellows to raise and
lower the chambers over a soil collar to make the flux measurement. This chamber
design minimizes perturbations of the microclimate inside the chamber for
accurate, repeatable measurements, and eliminates the need for chemical
scrubbers. The larger size of the 8100-103 allows the chamber to be placed on the
20 cm soil collars used with the LI-8100A Long-Term Chambers. This allows for
measurements of spatial variability on the same soil collars as are used for temporal
measurements, using a large exposed soil area.
A double-sealed gasket system seals the chambers both inside and outside of the
soil collar to minimize CO
2
leaks and wind effects. A pressure vent at the top of
the chambers prevents pressure spikes when the chambers close, and maintains the
chamber pressure at the ambient level under calm and windy conditions.
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