si_to_mai_max: Convert a Standard Site Index Into an maximum MAI Site Index

In ForestElementsR: Data Structures and Functions for Working with Forest Data

Convert a Standard Site Index Into an maximum MAI Site Index

Description

A less common, but sometimes useful way of site indexing is to give the site function converts a standard site index into such an maximum mai site index. Typically, the stand age where the maximum mai is obtained increases from better to lesser site index classes. See si_to_mai_age for an alternative mai based site indexing method.

Usage

si_to_mai_max(si, mai_variable, ytable)

Arguments

si	Standard site index to be converted, must correspond to the site index nomenclature of the yield table to be used (param ytable, see below).
mai_variable	Character, name of the mai_variable to be used. Must be one if the mai variables listed in the fe_yield_table object provided with the parameter ytable.
ytable	An object of class fe_yield_table

Value

The requested maximum mai value corresponding to the given standard site index

See Also

Other yield table functions: fe_yield_table(), plot.fe_yield_table(), si_to_mai_age(), site_index(), stocking_level(), yield_tables_for_species, ytable_age_slice(), ytable_lookup(), ytable_max_slice()

Examples

 mai_var <- "mai_m3_ha_yr" # mai in volume over bark before harvest

 si_to_mai_max(2.3, mai_var, fe_ytable_larch_schober_moderate_1946)
 si_to_mai_max(0.7, mai_var, fe_ytable_larch_schober_moderate_1946)
 si_to_mai_max(2.3, mai_var, fe_ytable_beech_wiedemann_moderate_1931)
 si_to_mai_max(0.7, mai_var, fe_ytable_beech_wiedemann_moderate_1931)

 mai_var <- "red_mai_m3_ha_yr" # mai in vol. under bark minus harvest losses
 si_to_mai_max(2.3, mai_var, fe_ytable_larch_schober_moderate_1946)
 si_to_mai_max(0.7, mai_var, fe_ytable_larch_schober_moderate_1946)
 si_to_mai_max(2.3, mai_var, fe_ytable_beech_wiedemann_moderate_1931)
 si_to_mai_max(0.7, mai_var, fe_ytable_beech_wiedemann_moderate_1931)

ForestElementsR documentation built on April 3, 2025, 7:47 p.m.