Skip to contents

Compute Biomass Water Productivity

Source: R/analysis_indicators.R
wapor_calc_bwp.Rd

BWP = Biomass / AETI, with unit conversion to kg/m3. AETI in mm is converted to m3/ha (1 mm = 10 m3/ha). BWP reflects total dry matter or above-ground biomass produced per cubic meter of water evaporated and transpired.

Usage

wapor_calc_bwp(
  biomass_value,
  aeti_mm,
  biomass_unit = "kg/ha",
  provenance = NULL,
  compatibility_mode = c("warn", "strict")
)

Arguments

biomass_value

Numeric. Biomass (scalar or raster).

aeti_mm

Numeric. Seasonal AETI in mm (scalar or raster).

biomass_unit

Character. Unit: "kg/ha" (default) or "t/ha".

provenance

Optional named provenance records for biomass and aeti. When omitted, raster metadata is checked where available.

compatibility_mode

Missing-metadata policy: "warn" or "strict". Known incompatibilities always stop the calculation.

Value

Numeric or SpatRaster. BWP in kg/m3.

References

Bastiaanssen, W. G. M., & Steduto, P. (2012). The water productivity score (WPS) for irrigated crops: Concept and application. Agricultural Water Management, 108, 119-132.

Examples

wapor_calc_bwp(12000, 400)  # 12000 kg/ha biomass, 400 mm -> kg/m3
#> [1] 3