ptfkit.wang2012¶
import ptfkit.wang2012;
Exported namespace: ptfkit::wang2012
Wang et al. (2012), surface loess across China's Loess Plateau.
Source¶
Wang, Y. Q., Shao, M. A., & Liu, Z. P. (2012). Pedotransfer functions for predicting soil hydraulic properties of the Chinese Loess Plateau. Soil Science, 177, 424-432.
DOI: 10.1097/SS.0b013e318255a449
Scope¶
Territory: Surface soils across the entire Loess Plateau, China
Dataset: 382 surface (0-5 cm) sites; 252 derivation and 130 validation data sets.
Wang2012PTFResult¶
struct Wang2012PTFResult {
double theta_s;
double theta_fc;
double k_sat;
};
| Field | Description |
|---|---|
theta_s | Saturated volumetric water content normalized from the regression's volume-percent scale. (cm^3/cm^3) |
theta_fc | Volumetric water content at -33 kPa normalized from the regression's volume-percent scale. (cm^3/cm^3) |
k_sat | Saturated hydraulic conductivity converted from cm/day. (m/s) |
Functions¶
calc_ptf_wang2012¶
Estimate saturated water content, field capacity, and saturated conductivity.
[[nodiscard]]
inline Wang2012PTFResult calc_ptf_wang2012(double sand, double silt, double clay, double bulk_density, double soil_organic_carbon, double altitude)
Parameters¶
| Name | Description |
|---|---|
sand | Sand content, 0.05-1 mm. (%) |
silt | Silt content, 0.002-0.05 mm. (%) |
clay | Clay content, <0.002 mm. (%) |
bulk_density | Bulk density. (g/cm^3) |
soil_organic_carbon | Soil organic carbon exposed by the public API as percent by mass. (%) |
altitude | Altitude above sea level. (m) |
Returns¶
A Wang2012PTFResult value.
Note
The regression uses source SOC in g/kg; the public API accepts percent.
Note
Base-10 logarithms reproduce the source's raw and transformed Ks ranges.
Note
Water-content equations are evaluated in percentage points and divided by 100 for public volumetric fractions.
Warning
This normalization intentionally changes the legacy water-content outputs by a factor of 100.