assmann_layers {ForestElementsR}R Documentation

Attribute Tree Heights to Layers After Ernst Assmann

Description

Tree heights are attributed to three layers as proposed by Assmann (1961). The layers are called Top, T, Middle, M, and Bottom, B, and correspond to >80%, >50%, and >0% of a reference height (usually the height of the highest tree in the stand of interest).

Usage

assmann_layers(heights, reference_height = NULL)

Arguments

heights

Vector of tree heights

reference_height

Reference height for the 100% level. If NULL (default), the maximum of heights will be used as reference height.

Value

An ordered factor of T, M, B values, corresponding to heights in the order as heights was provided.

References

Assmann E (1961). Waldertragskunde. Organische Produktion, Struktur, Zuwachs und Ertrag von Waldbestaenden. BLV Verlagsgesellschaft, Muenchen, Bonn, Wien.

See Also

Other structure and diversity: shannon_index(), species_profile()

Examples

  # Monospecific stand
  trees <- norway_spruce_1_fe_stand$trees
  assmann_layers(trees$height_m)

  # Selection forest
  trees <- selection_forest_1_fe_stand$trees
  assmann_layers(trees$height_m)


[Package ForestElementsR version 2.1.0 Index]