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.本数据集收录了通过离心法估算得到的土壤水力参数与相关特性。此类参数可广泛应用于van Genuchten–Mualem土壤持水模型（van Genuchten–Mualem soil water retention model），该模型用于刻画土壤含水量与基质势之间的量化关系。 本数据集包含以下参数： θ_r（残余含水量，residual water content）：指土壤在高基质势下干燥后剩余的含水量。 θ_s（饱和含水量，saturated water content）：指土壤所有孔隙均被水充满时的最大含水量。 α（尺度参数，scaling parameter）：指进气值处的基质势倒数，与大孔隙开始排水时的压力相关。 n（拟合参数，fitting parameter）：无量纲参数，用于描述土壤持水曲线的形态，与土壤孔隙度及孔径分布密切相关。 m（形状因子，shape factor）：用于描述持水曲线陡度的参数，根据Mualem约束条件定义为m=1−1/n。 FC（田间持水量，field capacity）：指基质势为−33 kPa（即330 cm水柱）时的土壤含水量，为植物可利用水分的上限。 PWP（永久萎蔫点，permanent wilting point）：指基质势为−1500 kPa（即15000 cm水柱）时的土壤含水量，为植物可利用水分的下限。 AWC（有效含水量，available water content）：指田间持水量与永久萎蔫点的差值（FC − PWP），用于表征可供植物吸收利用的土壤水分体积。