Soil CO2 measurments

Within the Action B5, UPM considers to quantify soil CO2 emission rates according to the remediation treatment applied (phytoremediation, bioremediation, ISCO or a combination of these) It is used the static closed chamber method to carry out regular in situ measurements.

Polyvinyl chloride rings, dimensions 10.75 cm high and 20 cm internal diameter, were lined with polystyrene mirror sheets to promote thermal insulation inside. Instantaneous flows of soil CO2 are quantified using a WMA-4 infrared analyzer (PPSystems, Herfordshire, UK) during approximately five minutes after place a sealed cylindrical chamber on each ring (Figure-4), taking care not to force the entry of atmospheric air to the ground. The CO2 emission rate will be calculated as the linear increase experienced by the gas concentration inside the chamber during the time that it remains closed. Additionally, some environmental variables will be measured in each determination of soil CO2 fluxes: atmospheric pressure, volumetric soil water content, air temperature and temperature over the first 10 cm of soil.

The measurements of soil CO2 emissions began the first week of June 2013. In this measurement campaign we did the set up and the assessment of the methodology. The measurements were taken in 5 points intentionally positioned around three trial pits, in an attempt to relate the fluxes with soil parameters from them.