Soil Hydraulic Properties

This dataset contains soil hydraulic parameters and properties estimated using the centrifuge method. These parameters are widely applied in the van Genuchten–Mualem soil water retention model, which describes the relationship between soil water content and matric potential.

The dataset includes:

θr (residual water content): The water content remaining in the soil after drying under high matric potential.

θs (saturated water content): The maximum water content when all pores are filled with water.

α (scaling parameter): The inverse matric potential at air-entry, related to the pressure at which large pores begin to drain.

n (fitting parameter): A dimensionless parameter describing the shape of the soil water retention curve, linked to porosity and pore size distribution.

m (shape factor): A parameter describing curve steepness, defined under Mualem’s restriction as m=1-1/n.

FC (field capacity): The water content at −33 kPa (330 cm), representing the upper limit of plant-available water.

PWP (permanent wilting point): The water content at −1500 kPa (15,000 cm), representing the lower limit of plant-available water.

AWC (available water content): The difference between field capacity and permanent wilting point (FC − PWP), indicating the volume of water available for plant uptake.