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Biomass equations for young Spanish plantations

eq_biomass_menendez_2022.Rd

Allometric equations for young (<30) plantations of 18 Spanish species including broadleaf and conifer species. Only aboveground biomass.

Usage

eq_biomass_menendez_2022(species, 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.

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 (18):

Betula sp., Fagus sylvatica, Juniperus thurifera, Pinus halepensis, Pinus nigra, Pinus pinaster, Pinus pinea, Pinus radiata, Pinus sylvestris, Quercus faginea, Quercus ilex, Quercus petraea, Quercus pyrenaica, Quercus robur, Quercus suber

Generic equations are also available for functional groups:

  • "Conifers" — generic equation for conifer species

  • "Deciduous broadleaves" — generic equation for deciduous broadleaf species

  • "Evergreen broadleaves" — generic equation for evergreen broadleaf species

Available components:

  • "AGB" — aboveground biomass (only component available; no component argument needed)

Important — non-standard input variables:

Unlike other biomass models, these equations were fitted on young plantations (< 30 years) and use different predictor variables:

  • Most species use rcd = root collar diameter (cm), not diameter at breast height. Pass it via the rcd argument of silv_predict_biomass().

  • Some species (Pinus halepensis, Pinus nigra, Quercus suber, Evergreen broadleaves) use bp = biomass packing (m3). Pass it via the bp argument of silv_predict_biomass().

  • Betula sp. uses only h (total height).

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_cudjoe_2024()

Examples

## AGB for Fagus sylvatica using root collar diameter
eq_biomass_menendez_2022("Fagus sylvatica")
#> <silviculture::ModelBiomass>
#>  @ equation  : chr "menendez-2022"
#>  @ species   : chr "Fagus sylvatica"
#>  @ component : chr "AGB"
#>  @ expression:'data.frame':	1 obs. of  2 variables:
#>  .. $ expression: chr "0.0574 * ((rcd ^ 2) * h) ^ 0.8930"
#>  .. $ species   : chr "Fagus sylvatica"
#>  @ url       : chr "https://doi.org/10.1016/j.biombioe.2022.106453"
#>  @ obs       : chr "AGB is the aboveground dry biomass or aerial biomass (kg), RCD is the root-collar-diameter (cm), h is the total"| __truncated__
#>  @ params    :List of 5
#>  .. $ return_r2  : logi FALSE
#>  .. $ return_rmse: logi FALSE
#>  .. $ comp       : chr "agb"
#>  .. $ r2         : num 0.97
#>  .. $ rmse       : num 3.5