“…Changes in soil structure will have a negative impact on oxygen transport if pore connectivity is decreased or positive if pore connectivity improves. Some effects of OM on soil structure are known (Dexter, 2004;Ellies, 2004;Six et al, 2004;Ellies et al, 2005;Grosbellet et al, 2011) but there is not much information about the effect of SOM on gas diffusion (Resurreccion et al, 2007), although effects of SOM on soil characteristics important for oxygen diffusion, such as the stability of aggregates and the pore matrix, have been reported (Dexter, 2004;Ellies, 2004;Six et al, 2004;Ellies et al, 2005;Grosbellet et al, 2011;Hamamoto et al, 2012;Uteau et al, 2013).…”