Soderberg1992formfactor: Form factor function for Individual trees in southern Sweden...

In Silviculturalist/forester: Forest Science and Forestry

Form factor function for Individual trees in southern Sweden from Söderberg 1992.

Description

Applicable counties:

Northern Sweden
	Norrbottens lappmark
	Norrbottens kustland
	Västerbottens lappmark
	Västerbottens kustland
	Västernorrland - Ångermanlands landskap
	Västernorrland - Medelpads landskap
	Jämtland - Jämtlands landskap
	Jämtland - Härjedalens landskap
	Kopparberg - Sälen-Idre.
Central Sweden
	Kopparberg - övriga
	Gävleborg - Hälsinglands landskap
	Gävleborg - övriga
	Värmland
Southern Sweden
	Stockholm
	Uppsala
	Västmanland
	Södermanland
	Örebro
	Östergötland
	Skaraborg
	Älvsborg - Västergötlands landskap
	Älvsborg - Dalslands landskap
	Jönköping
	Kronoberg
	Kalmar
	Halland
	Kristianstad
	Malmöhus
	Blekinge
	Gotland

Regarding the regional division of the models:

Freely translated from Söderberg 1986 p. 29: 'The regional division is motivated in the following. For Pine the country has been divided into 3 regions (see figure 4.1), which are based on the different forms of Scots Pine which have been distinguished by Sylvén 1917. The distribution of the different forms of Scots Pine is assumed to depend on the expansion-history of the Pine, according to which the Pine immigrated both from the north and the south with a transitional zone in central Sweden, where both forms are present. For other species, the change in genotype is more continuous over the country (Kiellander 1974). For Norway Spruce, it is assumed that it has had time for 30-50 generations in northern Sweden, contrasted against only 10-20 in southern Sweden (Kiellander 1966). Therefore the same regional division is used for Norway Spruce as for Scots Pine. For the other species, the regional division is limited to two regions, wherein the northern and central regions have been merged.

Usage

Soderberg_1992_form_factor_southern_Sweden_Spruce(
  SI100_Pine,
  distance_to_coast_km,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA_Birch.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Soderberg_1992_form_factor_southern_Sweden_Pine(
  SI100_Pine,
  distance_to_coast_km,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA_Birch.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0,
  county
)

Soderberg_1992_form_factor_southern_Sweden_Oak(
  SI100_Pine,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Spruce.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0,
  county
)

Soderberg_1992_form_factor_southern_Sweden_Broadleaves(
  SI100_Pine,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA_Birch.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Soderberg_1992_form_factor_southern_Sweden_Birch(
  SI100_Pine,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA_Birch.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0,
  county
)

Soderberg_1992_form_factor_southern_Sweden_Beech(
  SI100_Pine,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Spruce.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0,
  county
)

Soderberg_1992_form_factor_northern_Sweden_Pine(
  SI100_Pine,
  distance_to_coast_km,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Soderberg_1992_form_factor_northern_central_Sweden_Spruce(
  SI100_Pine,
  distance_to_coast_km,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Soderberg_1992_form_factor_northern_central_Sweden_Broadleaves(
  SI100_Pine,
  distance_to_coast_km,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Spruce.m2,
  BA_Birch.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Soderberg_1992_form_factor_northern_central_Sweden_Birch(
  SI100_Pine,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Soderberg_1992_form_factor_central_Sweden_Pine(
  SI100_Pine,
  distance_to_coast_km,
  DBH.cm,
  DBH_largest_tree_on_plot.cm,
  total_age,
  BA_Pine.m2,
  BA_Spruce.m2,
  BA_Birch.m2,
  BA.m2,
  latitude,
  altitude,
  divided_plot = 0
)

Arguments

SI100_Pine	SIH 100 Pine according to Hägglund 1974. e.g. Hagglund_1974_Sweden_height_trajectories_Pine
distance_to_coast_km	Closest distance to coast, in km, e.g. coast_distance
DBH.cm	Diameter over bark of tree, in cm.
DBH_largest_tree_on_plot.cm	Diameter over bark of the tree with the greatest diameter on the plot, cm.
total_age	Total age of the stand.
BA_Pine.m2	Basal Area m2 of Scots Pine
BA_Spruce.m2	Basal Area m2 of Norway Spruce
BA_Birch.m2	Basal Area m2 of Birch
BA.m2	Basal area m2 on plot.
latitude	Latitude, degrees.
altitude	Altitude, metres.
divided_plot	0 for full plots, 1 for divided plots.
county	County name.

Details

Beech Southern Sweden ##

Multiple correlation coefficient R	0.88
Spread about the function sf	0.181
sf/Spread about the mean	0.48
Number of observations	220

Norway Spruce Southern Sweden ##

Multiple correlation coefficient R	0.91
Spread about the function sf	0.152
sf/Spread about the mean	0.41
Number of observations	7467

Birch Southern Sweden ##

Multiple correlation coefficient R	0.82
Spread about the function sf	0.175
sf/Spread about the mean	0.58
Number of observations	1766

Broadleaves Southern Sweden ##

Multiple correlation coefficient R	0.77
Spread about the function sf	0.200
sf/Spread about the mean	0.64
Number of observations	837

Oak Southern Sweden ##

Multiple correlation coefficient R	0.83
Spread about the function sf	0.198
sf/Spread about the mean	0.57
Number of observations	292

Scots Pine Southern Sweden ##

Multiple correlation coefficient R	0.88
Spread about the function sf	0.147
sf/Spread about the mean	0.47
Number of observations	4628

Norway Spruce Northern or Central Sweden ##

Multiple correlation coefficient R	0.91
Spread about the function sf	0.151
sf/Spread about the mean	0.42
Number of observations	7470

Broadleaves Northern or Central Sweden ##

Multiple correlation coefficient R	0.85
Spread about the function sf	0.188
sf/Spread about the mean	0.54
Number of observations	318

Birch Northern or Central Sweden

Multiple correlation coefficient R	0.88
Spread about the function sf	0.157
sf/Spread about the mean	0.47
Number of observations	1747

Scots Pine Northern Sweden

Multiple correlation coefficient R	0.91
Spread about the function sf	0.129
sf/Spread about the mean	0.42
Number of observations	3832

Scots Pine Central Sweden

Multiple correlation coefficient R	0.92
Spread about the function sf	0.123
sf/Spread about the mean	0.38
Number of observations	2275

Value

Form quotient of the tree.

Source

Söderberg, U. (1992) Funktioner för skogsindelning: Höjd, formhöjd och barktjocklek för enskilda träd. / Functions for forest management: Height, form height and bark thickness of individual trees. Report 52. Dept. of Forest Survey. Swedish University of Agricultural Sciences. ISSN 0348-0496.

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