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Month: March 2014

Connecting and Programming Soil Moisture Probes with the LI-8100A

Connecting and Programming Soil Moisture Probes with the LI-8100A

LI-COR offers two soil moisture probes for use with the LI-8100A Automated Soil CO2 Flux System. The ThetaProbe model ML2x (Delta-T Devices Ltd., Cambridge, UK) and the ECH2O model EC-5 (Decagon Devices, Inc., Pullman, WA, USA) both provide a voltage signal that corresponds to the volumetric water content of the soil.  This value is a ratio, often expressed as θv = m3 H2O/m3 soil.  Among other things, soil moisture can help explain the magnitude of soil CO2 fluxes measured with…

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