This result might
imply the existence of a ‘‘blockage effect’’ from the presence of OM
on gas convection (ka) as in the case of gas diffusion (Dp/D0)
(Kuncoro et al., 2014). The OM-mixed soils had a slightly higher
value of n (4.16) than that of the control (3.76), which to some
extent implied a steeper decrease in ka100 with the level of
compaction (i.e., decrease in e100).