Skip to content

<ptfkit/wang2012.h>

#include <ptfkit/wang2012.h>

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.

PTF catalog page

wang2012_ptf_result

typedef struct {
    double theta_s;
    double theta_fc;
    double k_sat;
 } wang2012_ptf_result;
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.

static inline wang2012_ptf_result calc_ptf_wang2012(double sand, double silt, double clay, double bulk_density, double soil_organic_carbon, double altitude);

Parameters

Name Direction Description
sand in Sand content, 0.05-1 mm. (%)
silt in Silt content, 0.002-0.05 mm. (%)
clay in Clay content, <0.002 mm. (%)
bulk_density in Bulk density. (g/cm^3)
soil_organic_carbon in Soil organic carbon exposed by the public API as percent by mass. (%)
altitude in Altitude above sea level. (m)

Returns

A wang2012_ptf_result 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.