• Soil respiration is measured as the rate of CO2 accumulation by the Q-S151 CO2 Analyzer. Soil respiration may be measured in situ with a soil chamber placed over the soil in the field.
• Samples of soil may be brought back to the lab and measured in a flow-through chamber for CO2 production. In addition to soil respiration, Q-Box SR1LP package allows measurements of soil temperature with the S132 temperature probe and water loss from the soil with the S161 Temperature/Relative Humidity sensor. Soil moisture is measured with the S135 Soil Moisture Sensor. The flow through the system is monitored by the Q-G266 Flow Monitor. An absolute pressure sensor provides measurements of atmospheric pressure. The Analog signals from all of the sensors and analyzers are converted to digital signals via two integrated LabQuest mini interfaces and one single USB interface for a total of 7 channels. Data is displayed, recorded, and manipulated on a PC using Logger Pro software.
• There are many other potential applications for Q-Box SR1LP package both in open flow and closed gas exchange systems. For example, it can be used to measure CO2 exchange from any organism or sample maintained in a flow-through chamber. In addition, it can be used to examine respiration or fermentation in aqueous suspensions when air or N2 is bubbled through the suspension and the outflow gas is analyzed using the CO2 Analyzer. Provided that CO2 production rates are in the correct range, the package can be used to measure CO2 production of virtually any biological system.

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