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Biomass equations for Spanish species

eq_biomass_montero_2005.Rd

Allometric equations adjusted for Spanish species

Usage

eq_biomass_montero_2005(species, component = "stem", return_r2 = 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.

Value

A ModelBiomass object containing the configured model parameters and expressions.

Details

Supported species (35):

Abies alba, Abies pinsapo, Alnus glutinosa, Betula spp., Castanea sativa, Ceratonia siliqua, Erica arborea, Eucalyptus spp., Fagus sylvatica, Fraxinus spp., Ilex canariensis, Juniperus oxycedrus, Juniperus phoenicea, Juniperus thurifera, Laurus azorica, Myrica faya, Olea europaea var. sylvestris, Other broadleaves, Other conifers, Other laurel species, Pinus canariensis, Pinus halepensis, Pinus nigra, Pinus pinaster, Pinus pinea, Pinus radiata, Pinus sylvestris, Pinus uncinata, Populus x euramericana, Quercus canariensis, Quercus faginea, Quercus ilex, Quercus pyrenaica, Quercus robur, Quercus suber

Available components:

Aboveground / belowground groups (summed automatically):

  • "AGB" — total aboveground biomass

  • "BGB" — total belowground biomass (roots)

  • "all" or "tree" — total tree biomass (AGB + BGB)

Tree structural groups:

  • "stem" — stem fraction(s)

  • "branches" — all branch fractions combined

  • "roots" — roots (equivalent to BGB)

Individual tree components (species availability varies):

  • "stem" — stem wood

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

  • "thick branches" — branches > 7 cm

  • "medium branches" — branches 2–7 cm

  • "small branches" — branches < 2 cm

  • "leaves" — foliage (including needles)

  • "roots" — coarse roots

Note that for this model, "tree" (or "all") is an independent regression equation fitted to total-tree data. It was not derived by summing the AGB and BGB equations. Consequently, there is a numerical discrepancy between the direct "tree" estimation and the sum of separate "AGB" and "BGB" estimations (e.g. for Pinus sylvestris at diameter = 20 cm and height = 10 m, the direct total is 89.1 kg, while AGB + BGB is 115.9 kg, a 24% difference).

Also, the following 6 species have no BGB/roots equations in this model: Abies pinsapo, Erica arborea, Eucalyptus spp., Ilex canariensis, Laurus azorica, Myrica faya (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_dieguez_aranda_2009(), 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_montero_2005("Pinus pinaster", "AGB")
#> <silviculture::ModelBiomass>
#>  @ equation  : chr "montero-2005"
#>  @ species   : chr "Pinus pinaster"
#>  @ component : chr "AGB"
#>  @ expression:'data.frame':	5 obs. of  2 variables:
#>  .. $ expression: chr  "exp((0.191593 ^2) / 2) * exp(-3.43957) * (d ^ 2.56636)" "exp((0.324283 ^2) / 2) * exp(-23.0418) * (d ^ 6.52359)" "exp((0.744427 ^2) / 2) * exp(-6.66264) * (d ^ 2.63946)" "exp((0.527572 ^2) / 2) * exp(-4.66658) * (d ^ 2.38009)" ...
#>  .. $ species   : chr  "Pinus pinaster" "Pinus pinaster" "Pinus pinaster" "Pinus pinaster" ...
#>  @ url       : chr "https://gregoriomontero.wordpress.com/wp-content/uploads/2016/09/2005-01-monografc3ada-forestal-13-m-produccic3"| __truncated__
#>  @ obs       : chr "Diameter is assumed to in centimeters, and height is assumed to be in meters"
#>  @ params    :List of 3
#>  .. $ return_r2: logi FALSE
#>  .. $ comp     : chr [1:5] "stem" "thick branches" "medium branches" "small branches" ...
#>  .. $ r2       : num [1:5] 0.964 0.927 0.651 0.752 NA