Elfving_1992_stocking_natural_regeneration: Stocking (0-1) in natural regenerations from Elfving 1992.

In Silviculturalist/forester: Forest Science and Forestry

Stocking (0-1) in natural regenerations from Elfving 1992.

Description

OBSERVE! Plausible retransformation error? Distance from equator calculated as 111 km * latitude. Jämtland county has been interpreted as both Jämtland - Härjedalens landskap and Jämtland - Jämtlands landskap.

OBSERVE! This function includes the modifications to coefficients as defined on p. 6 in the source: For natural regenerations the effect by scarification has been modified to 0.30 on mesic sites and 0.15 on other sites.

Usage

Elfving_1992_stocking_natural_regeneration(
  latitude,
  altitude,
  proportion_cultivated,
  demanded_seedlings_per_ha = 2500,
  growth_periods_since_cut = 12,
  soil_moisture,
  county,
  scarification,
  prescribed_burning,
  untreated,
  uncleaned,
  seed_trees_per_ha,
  Jonson_site_class,
  area
)

Arguments

latitude	Latitude north, decimal degrees.
altitude	Meters above sea level.
proportion_cultivated	Proportion of cultivated seedlings according to inventory.
demanded_seedlings_per_ha	Number of seedlings demanded for full stocking. Default 2500 as per implementation.
growth_periods_since_cut	Number of growth periods since the cut. Default 12 as per implementation.
soil_moisture	Type 1="Dry/torr",2="Mesic/frisk",3="Mesic-moist/frisk-fuktig",4="Moist/fuktig",5="Wet/Blöt"
county	County, e.g. [forester::county_sweden()]
scarification	TRUE if site has been scarified, otherwise FALSE.
prescribed_burning	TRUE if a prescribed burn has been done after the cut, otherwise FALSE.
untreated	TRUE if there were no measures done to promote regeneration after the final felling, otherwise FALSE.
uncleaned	TRUE if bushes and small trees remain after clear-felling, otherwise FALSE.
seed_trees_per_ha	Number of seed trees per hectare.
Jonson_site_class	Site class according to Jonson 1914. e.g. [forester::Hagglund_1981_si_to_bonitet()] and [forester::Jonson_1914_MAI_to_class()]
area	Area of site in hectares.

Details

n = 2462

R^2 = 0.492

s-res = 0.475

Mean of dependents (?): 1.8585

Value

A list with elements (1) : Stocking, varying between 0-1, and (2): Young stand quality W.

Source

Elfving, B. (1992). Återväxtens etablering och utveckling till röjningstidspunkten. SLU, Institutionen för Skogsskötsel. Arbetsrapport nr. 67. Available, p.5 : https://www.heurekaslu.se/w/images/9/93/Heureka_prognossystem_%28Elfving_rapportutkast%29.pdf

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