Technical information

APPENDIX D

3/31/2008 Rev. 4.3 D - 1

APPENDIX D

CI-301SR SOIL RESPIRATION CHAMBER

The CI-301SR Soil Respiration chamber allows easy measurements of soil respiration using the

Closed System mode of the CI-340.

Connect the CI-301SR (see Figure D-1) to the CI-340 in the Closed System configuration (refer to the

CLOSED SYSTEM section if you need further assistance). Insert the PAR sensor firmly into its

respective slot on top of the soil respiration chamber (refer to the LEAF CHAMBER - CARE AND

USE section). The IR Temperature sensor must be used to detect soil temperatures. Plug its cable into

the CI-340, then into the respective hole on top of the chamber.

Now, place the CI-301SR on the area of soil that you wish to measure with the open end of the

cylinder downwards. Rotate the chamber slightly to ensure that the cylinder is seated into the surface

of the soil; a good seal is important to obtain accurate readings. If you need PAR readings, check so

that the PAR sensor is under direct sunlight.

Soil respiration results will be shown as the photosynthesis reading. Note that the readings will be

displayed in negative values.

Clean the CI-301SR after use. A soft, dry cloth will usually suffice, but water and mild detergent may

be used, if necessary. Never immerse the chamber in water or pour water into the cylinder. The

chamber contains electronic components, which can be damaged by liquids.

Setup Procedures

• Create file

• Time Interval – Sampling Time

• Photosynthesis Mode P

• Zero for no accessory units

• Leaf area = soil area = 73.4 cm²

• Recommended flow rate 0.5 lpm

• Chamber volume is 0.634 liters with soil at the edge of chamber

• Chamber volume is 0.580 liters with edge 1 cm. into soil

• Time or CO

End (Time is the length to run measurement; CO

is the concentration level to

end measurement). Enter T or C

• Enter time value or CO

concentration value

• Measurement begins