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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 S7 list of parameters

Details

There are seven species included in this model: Pinus pinaster, Pinaster radiata, Pinus sylvestris, Eucalyptus globulus, Eucalyptus nitens, Quercus robur, and Betula alba

The tree components are divided into groups, and any of them can be introduced in the component argument:

  • AGB: all aboveground biomass components

  • BGB: all belowground biomass compoponents

  • tree: total tree biomass includying AGB and BGB

Then we have the second group of components, which are related to tree groups:

  • stem: includes the stem and bark

  • branches: includes all branches

  • roots: includes the roots (same as BGB)

Finally, we have the last level, which includes tree components (not all of them are available for all species): stem, bark, thick branches (>7cm), medium branches (2-7cm), thin branches (0.5-2cm), twigs (<0.5cm), dry branches, leaves, roots. In some species, there's "stem and thick branches", instead of two groups.

Users can check the list of supported species and their corresponding components in biomass_models.

See also

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

Examples

## get model parameters for silv_predict_biomass
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