Estimate potential net primary production.

Estimates potential net primary production per unit area, used downstream to scale weed biomass on cropland. Several methods are available; the default lpjml reads gross managed-grassland NPP from a finished LPJmL run, while the climate methods compute potential NPP from temperature, water input and actual evapotranspiration.

Usage

calculate_potential_npp(
  x,
  method = c("lpjml", "miami", "nceas", "rosenzweig"),
  lpjml = list()
)

Arguments

x

A tibble. The climate methods require temp_c (mean annual temperature, degrees C), water_input_mm (precipitation plus irrigation) and aet_mm (actual evapotranspiration). The lpjml method instead needs a spatial key to join the gridded grass NPP (see lpjml).

method

Potential-NPP method, one of "lpjml" (default), "miami", "nceas" or "rosenzweig".

lpjml

A named list of options for the lpjml method (passed to the LPJmL grass reader). Ignored by the climate methods.

Value

The input tibble with npp_potential_dm_t_ha (potential NPP, t DM per hectare) and method_npp_potential (the method used).

Examples

calculate_potential_npp(
  tibble::tibble(temp_c = 15, water_input_mm = 800, aet_mm = 700),
  method = "miami"
)
#> # A tibble: 1 × 5
#>   temp_c water_input_mm aet_mm npp_potential_dm_t_ha method_npp_potential
#>    <dbl>          <dbl>  <dbl>                 <dbl> <chr>               
#> 1     15            800    700                  12.4 miami