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…