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Biomass equations for 2 species in Castille and León (Spain)

eq_biomass_cudjoe_2024.Rd

Allometric equations adjusted for Quercus petraea, and Pinus sylvestris in Castille and León (Spain)

Usage

eq_biomass_cudjoe_2024(species, component = "AGB", return_rmse = FALSE)

Arguments

species

A character string specifying the scientific name of the tree species. It can be a column name if all the species are included in this model. See Details for available species.

component

A character string specifying the tree component for biomass calculation (e.g., "stem", "branches"). See Details.

return_rmse

A logical value. If TRUE, the function returns the root mean squared error (RMSE) of the selected model instead of the biomass value.

Value

A ModelBiomass object containing the configured model parameters and expressions.

Details

Supported species (3):

  • Pinus sylvestris

  • Quercus petraea

  • "mixed" — mixed stand of Pinus sylvestris × Quercus petraea

Available components:

Aboveground group (summed automatically):

  • "AGB" — total aboveground biomass (sum of all components below)

Individual tree components (species availability varies):

  • "stem" — stem wood (all species)

  • "thick branches" — branches > 7 cm (all species)

  • "medium branches and small branches" — branches < 7 cm (all species)

  • "leaves" — foliage/needles (Pinus sylvestris only)

Note that no belowground biomass (BGB / roots) or total-tree equations are available in the source paper for this model.

Users can check all available species and components in the biomass_models dataset provided by the library.

See also

silv_predict_biomass(), biomass_models, eq_biomass_montero_2005(), eq_biomass_dieguez_aranda_2009(), eq_biomass_ruiz_peinado_2011(), eq_biomass_ruiz_peinado_2012(), eq_biomass_manrique_2017(), eq_biomass_menendez_2022()

Examples

## Aboveground biomass for a mixed stand
eq_biomass_cudjoe_2024("mixed", "AGB")
#> <silviculture::ModelBiomass>
#>  @ equation  : chr "cudjoe-2024"
#>  @ species   : chr "Pinus sylvestris x Quercus petraea"
#>  @ component : chr "AGB"
#>  @ expression:'data.frame':	3 obs. of  2 variables:
#>  .. $ expression: chr  "0.1714*(-1) + 0.2388 * h" "0.7843 + 0.0952 * h" "1.8675*(-1) + 0.1974 * h"
#>  .. $ species   : chr  "Pinus sylvestris x Quercus petraea" "Pinus sylvestris x Quercus petraea" "Pinus sylvestris x Quercus petraea"
#>  @ url       : chr "https://doi.org/10.1016/j.scitotenv.2024.176061"
#>  @ obs       : chr "Diameter is assumed to in centimeters, and height is assumed to be in meters"
#>  @ params    :List of 4
#>  .. $ return_rmse: logi FALSE
#>  .. $ comp       : chr [1:3] "stem" "thick branches" "medium branches and small branches"
#>  .. $ r2         : num [1:3] NA NA NA
#>  .. $ rmse       : num [1:3] 0 0 0.1