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Calculate indicators for water holding capacity in the topsoil

osi_p_whc.Rd

This function calculates different kind of Water Retention Indices given the continuous pedotransferfunctions of Wosten et al. (2001) These include : 'water holding capacity','plant available water' and 'Ksat'

Usage

osi_p_whc(
  A_CLAY_MI,
  A_SAND_MI,
  A_SOM_LOI,
  type = "whc",
  ptf = "Wosten1999",
  pwarning = FALSE
)

Arguments

A_CLAY_MI

(numeric) The clay content of the soil (%)

A_SAND_MI

(numeric) The sand content of the soil (%)

A_SOM_LOI

(numeric) The organic matter content of the soil (%)

type

(character) The type of water retention index. Options include c('water holding capacity', 'whc','plant available water','paw','Ksat' or 'ksat')

ptf

(character) Pedotransfer functions to calculate van Genuchten parameters. Options include c('Wosten1999', 'Wosten2001', 'Klasse')

pwarning

(boolean) Option to print a warning rather than error (stop) message for input checks (TRUE or FALSE)

Value

The function returns by default the water holding capacity ('whc') of the top soil (in mm). A numeric value. Other outputs include 'plant available water' (or 'paw') or 'ksat' being the saturated permeability. Soil functions are evaluated given a threshold value and expressed as a distance to target.

References

Wosten et al. (2001) Pedotransfer functions: bridging the gap between available basic soil data and missing hydraulic characteristics. Journal of Hydrology 251, p123.

Examples

osi_p_whc(A_CLAY_MI = 20.5,A_SAND_MI = 65,A_SOM_LOI = 3.5)
#> [1] 0.8273837
osi_p_whc(A_CLAY_MI = 5,A_SAND_MI = 15,A_SOM_LOI = 6.5)
#> [1] 0.8251179
osi_p_whc(A_CLAY_MI = 5,A_SAND_MI = 15,A_SOM_LOI = 6.5, 
type = 'water holding capacity')
#> [1] 0.8251179