Elfving_2003_single_tree_age_estimation: Functions for estimation of single tree ages at breast height

In Silviculturalist/forester: Forest Science and Forestry

Functions for estimation of single tree ages at breast height

Description

Functions for estimation of single tree ages at breast height

Usage

Elfving_2003_single_tree_age_estimation(
  diameter_cm,
  diameter_ba,
  mean_diameter_codominant_trees,
  latitude,
  altitude,
  total_stand_age,
  SIS_100,
  Basal_area_plot,
  species,
  vegetation,
  even_aged,
  county,
  peat,
  ditch
)

Arguments

diameter_cm	diameter at breast height, cm
diameter_ba	diameter of basal area weighted mean tree, cm.
mean_diameter_codominant_trees	Mean Diameter of the co-dominant trees, e.g. [forester::Elfving_2003_mean_diameter_codominant_trees()]
latitude	latitude
altitude	altitude, metres above sea level.
total_stand_age	total stand age
SIS_100	Site index from stand variables, meters. e.g. [forester::Hagglund_Lundmark_1979_Site_Index_Prediction()]
Basal_area_plot	As estimated with relascope in field. m^2 / ha
species	One of: "Pinus sylvestris", "Picea abies", "Betula pendula", "Betula pubescens", "Fagus sylvatica", "Quercus robur","Ulmus glabra","Tilia cordata","Acer platanoides","Prunus avium","Salix ..","Carpinus betulus" or "Sorbus aucuparia"
vegetation	vegetation Vegetation type according to follows Swedish National forest inventory FALTSKIKT: Code Vegetation 1 Rich-herb without shrubs 2 Rich-herb with shrubs/bilberry 3 Rich-herb with shrubs/lingonberry 4 Low-herb without shrubs 5 Low-herb with shrubs/bilberry 6 Low-herb with shrubs/lingonberry 7 No field layer 8 Broadleaved grass 9 Thinleaved grass 10 Sedge, high 11 Sedge, low 12 Horsetail, Equisetum ssp. 13 Bilberry 14 Lingonberry 15 Crowberry 16 Poor shrub 17 Lichen, frequent occurrence 18 Lichen, dominating
even_aged	TRUE / FALSE, above 80 percent of volume within 20 yr span.
county	Swedish county
peat	TRUE / FALSE
ditch	TRUE / FALSE

Value

A list, with element 1 : Age at breast height, 2: Boolean if tree is a standard, 3: Boolean if tree is suppressed.

Source

Elfving, B. (2003) Ålderstilldelning till enskilda träd i skogliga tillväxtprognoser. SLU, inst. f. skogsskötsel. Arbetsrapport 182.

Silviculturalist/forester documentation built on April 20, 2024, 2:13 p.m.