Volumetric anaerobic soil fraction

The volumetric anaerobic fraction of the soil is calculated as:

                                                           (6.99)

where g_aporshape is a shape parameter and O_volcons is the volumetric oxygen concentration calculated as:

                                                    (6.100)

where O_O2Conc is the oxygen concentration, o_ratioair is the ratio of oxygen to air and ρ_a(T) is the air density temperature function. See viewing function Anaerobic volumetric fraction.