Credit: Image courtesy of T.K. Tokunaga, et al., Vadose Zone Journal (2016). [DOI: 10.2136/vzj2016.02.0014]
Left: Rifle, Colorado, floodplain vadose zone profile. Middle: Instrumentation for monitoring pore water and gas profiles down to the 3.5-m depth. Right: Respiration profiles sustained by organic carbon carried in infiltration water.