Activity: Talks and presentations › Conference presentations
Linking unsaturated air permeability to saturated hydraulic permeability to characterize functional soil structure. Previous studies showed that the unsaturated air permeability (k_a) and the saturated hydraulic permeability (k_s) are linked to soil functional structure. Combining the two measured may lead to better characterization of the soil structure. k_a and k_s were measured on four differently textured Danish agricultural top-soils. Furthermore, k_a was measured for different water potentials (psi) ranging from -50 to -1000 cm water column. Form the k_a measurements the air-filled pore network complexity factor (A) could be derived. The determination of the pecolation threshold (e_cr, air filled porosity at which k_a = 1 micrometer2), the air filled pore network complexity factor and the air filled porosity at which k_a = k_s, and relating those parameters to the dry bulk density enables to determine how soil structure reacts to soil compaction.