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The Soil Respiration System consists of the SRC-1 Soil Respiration
Chamber and the EGM Environmental Gas Monitor. A chamber of known
volume is placed on the soil and the rate of increase in CO2
within the chamber is monitored. The air is continuously sampled in a
closed circuit through the EGM , and the soil respiration rate is
calculated, displayed and recorded by the analyser. The air within
the chamber is carefully mixed to ensure representative sampling
without generating pressure differences which would affect the
evolution of CO2 from the soil surface. The system can
be readily adapted to animal respiration studies or to other
measurements of CO2 gas exchange.
- Choice of two systems available (for EGM or CIRAS)
- Simultaneous measurement of soil temperature as an optional extra
- Robust chamber construction
- Ergonomic system design allows for rapid and easy measurements
- On-line statistical data analysis
- Full data storage capability
- RS232 output for transfer to a computer or printer
- Low cost (EGM based system)
Once the SRC-1 chamber has been placed on the soil, the rate of
increase in CO2 in the system should be linear, though
any exchange with the outside air will cause it to decline with
time. The CO2 concentration is measured every 8 seconds,
and a quadratic equation fitted to the relationship between the
increasing CO2 concentration and elapsed time. The
coefficients of this are used to determine the rate of increase at
time 0. A warning is given if the relationship is excessively
non-linear.
Technical Specifications
- Inputs
Soil Temperature: 0 - 1 V = 0-50°C
- Storage
Capacity to store up to 1,500 records
- Record Options
Automatic logging after 120 s, or if the system CO2
concentration
increases by more than 60 ppm Manual logging by key press
- Power Supply
12 V 2.0 Ah lead acid battery giving up to 5 hours continuous
use.
- Range
0 - 9.99 g CO2 m-² hour-¹
- Fan
12 V DC
- Housing
PVC and stainless steel
- Dimensions
100 mm Ø x 150 mm H (excluding handle)
- Weight
900 g
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