Skip to contents

Biomass equations two Quercus species

eq_biomass_manrique_2017.Rd

Allometric equations adjusted for Quercus petraea and Quercus pyrenaica in Palencia, Spain

Usage

eq_biomass_manrique_2017(
  species,
  component = "AGB",
  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., "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 (2):

  • Quercus petraea

  • Quercus pyrenaica

Available components:

Aboveground group (summed automatically):

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

Individual tree components:

  • "stem and thick branches" — stem together with branches > 7 cm

  • "medium branches" — branches 2–7 cm

  • "small branches" — branches < 2 cm

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

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_menendez_2022(), eq_biomass_cudjoe_2024()

Examples

## Aboveground biomass for Quercus petraea
eq_biomass_manrique_2017("Quercus petraea", "AGB")
#> <silviculture::ModelBiomass>
#>  @ equation  : chr "manrique-2017"
#>  @ species   : chr "Quercus petraea"
#>  @ component : chr "AGB"
#>  @ expression:'data.frame':	3 obs. of  2 variables:
#>  .. $ expression: chr  "0.001333 * (d ^ 2) * h" "0.006531 * (d ^ 2) * h - 0.07298 * d * h" "0.023772 * (d ^ 2) * h"
#>  .. $ species   : chr  "Quercus petraea" "Quercus petraea" "Quercus petraea"
#>  @ url       : chr "https://7cfe.congresoforestal.es/sites/default/files/comunicaciones/772.pdf"
#>  @ 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 [1:3] "stem and thick branches" "medium branches" "small branches"
#>  .. $ r2         : num [1:3] 0.868 0.873 0.99
#>  .. $ rmse       : num [1:3] 29197 120699 155704