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Biomass equations for Galician species

eq_biomass_dieguez_aranda_2009.Rd

Allometric equations adjusted for Galician (Spain) species

Usage

eq_biomass_dieguez_aranda_2009(
  species,
  component = "stem",
  return_r2 = FALSE,
  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., "tree", "stem", "branches"). See Details.

return_r2

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

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 (7):

Betula alba, Eucalyptus globulus, Eucalyptus nitens, Pinus pinaster, Pinus radiata, Pinus sylvestris, Quercus robur

Available components:

Aboveground / belowground groups (summed automatically):

  • "AGB" — total aboveground biomass

  • "BGB" — total belowground biomass (roots)

Tree structural groups:

  • "stem" — stem fraction(s)

  • "branches" — all branch fractions combined

  • "roots" — roots (equivalent to BGB)

Individual tree components (species availability varies):

  • "stem and thick branches" — stem together with thickest branches

  • "thick branches" — branches > 7 cm

  • "medium branches" — branches 2–7 cm

  • "small branches" — branches 0.5–2 cm

  • "twigs" — branches < 0.5 cm

  • "dry branches" — dead attached branches

  • "leaves" — foliage (including needles)

  • "roots" — coarse roots

Note that total-tree equations ("tree" / "all") are not available for this model. Also, Eucalyptus globulus, Eucalyptus nitens, and Pinus pinaster lack BGB equations (requesting "BGB" or "roots" will fail).

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_ruiz_peinado_2011(), eq_biomass_ruiz_peinado_2012(), eq_biomass_manrique_2017(), eq_biomass_menendez_2022(), eq_biomass_cudjoe_2024()

Examples

## Aboveground biomass for Pinus pinaster
eq_biomass_dieguez_aranda_2009("Pinus pinaster", "AGB")
#> <silviculture::ModelBiomass>
#>  @ equation  : chr "dieguez-aranda-2009"
#>  @ species   : chr "Pinus pinaster"
#>  @ component : chr "AGB"
#>  @ expression:'data.frame':	6 obs. of  2 variables:
#>  .. $ expression: chr  "0.3882 + 0.01149 * (d ^ 2) * h" "0.0079 * (d ^ 2.098) * (h ^ 0.466)" "3.202 - 0.01484 * (d ^ 2) - 0.4228 * h + 0.00279 * (d ^ 2) * h" "0.09781 * (d ^ 2.288) * (h ^ (-0.9648))" ...
#>  .. $ species   : chr  "Pinus pinaster" "Pinus pinaster" "Pinus pinaster" "Pinus pinaster" ...
#>  @ url       : chr "https://www.researchgate.net/publication/312219888_Herramientas_selvicolas_para_la_gestion_forestal_sostenible_en_Galicia"
#>  @ obs       : chr "Diameter is assumed to in centimeters, and height is assumed to be in meters"
#>  @ params    :List of 5
#>  .. $ return_r2  : logi FALSE
#>  .. $ return_rmse: logi FALSE
#>  .. $ comp       : chr [1:6] "stem and thick branches" "bark" "thick branches" "medium branches" ...
#>  .. $ r2         : num [1:6] 0.908 0.943 0.806 0.826 0.678 0.823
#>  .. $ rmse       : num [1:6] 51.2 6.3 13.8 4.7 1.4 5.8