Li et al. (2007), Fengqiu County, North China Plain, China.¶
Source¶
Li, Y., Chen, D., White, R. E., Zhu, A., & Zhang, J. (2007). Estimating soil hydraulic properties of Fengqiu County soils in the North China Plain using pedo-transfer functions. Geoderma, 138(3-4), 261-271.
DOI: 10.1016/j.geoderma.2006.11.018
Scope¶
Territory: Fengqiu County soils in the North China Plain, China
Dataset: 63 soil water retention curves and 36 saturated soil hydraulic conductivity samples from seven soil profiles.
Functions¶
calc_ptf_li2007¶
Estimate van Genuchten parameters and saturated hydraulic conductivity for Fengqiu County soils.
Status: implemented
Prediction target: Van Genuchten saturated water content, alpha, n, and saturated hydraulic conductivity.
Models: \(h(\theta)\) — Van Genuchten model without residual water content term; \(k(h)\) — Saturated hydraulic conductivity
Inputs¶
| Name | Type | Unit | Domain | Description |
|---|---|---|---|---|
sand | number | % | value > 0 | Sand content, 0.02-2 mm. |
silt | number | % | value > 0 | Silt content, 0.02-0.002 mm. |
clay | number | % | value > 0 | Clay content, <0.002 mm. |
bulk_density | number | g/cm^3 | value > 0 | Bulk density. |
soil_organic_matter | number | % | value > 0 | Soil organic matter. |
Outputs¶
| Name | Unit | Domain | Description |
|---|---|---|---|
theta_s | cm^3/cm^3 | value >= 0 | Saturated water content. |
a_vg | cm^-1 | value >= 0 | Van Genuchten alpha parameter, inversely related to air-entry suction. |
n_vg | dimensionless | value > 1 | Van Genuchten n parameter that characterizes pore-size distribution. |
k_sat | m/s | value >= 0 | Saturated hydraulic conductivity. |
Warning
The formulas use natural logarithms of selected inputs.