Elfving_1992_stocking_cultivated_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: Increased efficiency in provenance selection and scarification has also been considered by assumed influence on the cofficients. For cultivations the negative effect by increasing height above see level has been reduced from -0.0514 to -0.0257 and the positive effect by scarification has been increased from 0.0757 to 0.2.

Usage

Elfving_1992_stocking_cultivated_regeneration(
  latitude,
  altitude,
  demanded_seedlings_per_ha = 2500,
  spacing,
  growth_periods_since_cut = 12,
  county,
  sown,
  spruce,
  scarification,
  prescribed_burning,
  Jonson_site_class
)

Arguments

latitude	Latitude north, decimal degrees.
altitude	Meters above sea level.
demanded_seedlings_per_ha	Number of seedlings demanded for full stocking. Default 2500 as per implementation.
spacing	Average square spacing used at sowing or planting.
growth_periods_since_cut	Number of growth periods since the cut. Default 12 as per implementation.
county	County, e.g. [forester::county_sweden()]
sown	TRUE, if the site has been sown. Otherwise FALSE.
spruce	TRUE, if the site has been cultivated with Spruce. Otherwise FALSE.
scarification	TRUE if site has been scarified, otherwise FALSE.
prescribed_burning	TRUE if a prescribed burn has been done after the cut, otherwise FALSE.
Jonson_site_class	Site class according to Jonson 1914. e.g. [forester::Hagglund_1981_si_to_bonitet()] and [forester::Jonson_1914_MAI_to_class()]

Details

n = 3528

R^2 = 0.492

s-res = 0.391

Mean of dependents (?): 2.3059

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.