Soil CO2 concentration (DP1.00095.001)

CO2 concentrations are measured at different depths in the soil to allow the gradient method to be used to estimate soil CO2 efflux rates when combined with other NEON data products. Soil CO2 efflux is an important component of the carbon cycle because it is one of the largest exchanges of carbon between terrestrial ecosystems and the atmosphere. In addition, since the vast majority of soil CO2 is produced by microbial, root and soil faunal respiration, soil CO2 efflux is an indicator of total soil biological activity. CO2 concentrations are measured in all five Instrumented soil plots per terrestrial site and at various depths below the soil surface starting at approximately 2 cm and data are presented as 1-minute and 30-minute averages. CO2 sensors at different depths within a soil plot are typically located within 1 m horizontally of one another. The CO2 concentration of soil air is measured at three depths within each plot, starting at approximately 2 cm.

Latency:
Data collected in any given month are published during the second full week of the following month.