Using the Long-Term Chambers
7-7
Use the Chamber pull-down menu to choose Long Term (8100-104). The
Soil Area value and Total System Volume values are automatically displayed.
The Temperature Source determines where the air temperature measurement
used for the flux calculations is obtained. When using a LI-COR soil chamber,
this field should always be set to ‘Chamber’, so that the temperature
measurement is made using the thermistor located inside the chamber. For
other experimental protocols (e.g. making flask measurements), however, you
can choose to map the temperature measurement to any of the analog voltage
input channels (V1-V4 with the Auxiliary Sensor Interface, or V2-V4 with the
8100-104/C and the LI-8150 Multiplexer), and then use the appropriate V1-V4
tabbed page to enter the coefficients for the user-supplied temperature
thermistor. The temperature derived from that input channel will then be used
for the calculations.
Enter the Chamber Offset (cm). The Chamber Offset is the distance (in cm)
between the soil surface and the top of the soil collar, and is dependent upon
the depth that the collar is inserted into the ground. The soil CO
2
flux
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