Nyssonen_stand_increment: Five-year Stand Increment for even-aged stands of Scots Pine...

In Silviculturalist/forester: Forest Science and Forestry

Five-year Stand Increment for even-aged stands of Scots Pine and Norway Spruce in Finland.

Description

OBS. Controlled, but may differ from tables (errata correction?)

Usage

Nyyssonen_1978_stand_volume_increment_Finland_Spruce(
  age,
  volume_m3_ha,
  BA_mean_diameter = 0,
  vegetation = "OMT"
)

Nyyssonen_1978_stand_volume_increment_Finland_Pine(
  age,
  volume_m3_ha,
  BA_mean_diameter = 0,
  vegetation = "OMT"
)

Arguments

age	Age, years.
volume_m3_ha	Stem Volume m^3/ha
BA_mean_diameter	Optional for improved function. Basal area weighted mean diameter (median of basal area)
vegetation	Optional for improved function in Spruce. Necessary for Pine. One of [forester::Finland_vegetation_types()]

Details

• Spruce function no. 18 (diameter) n= 146. R^2=0.893. se percent 16.8.

• Spruce function no. 19 (w/o diameter) n= 146. R^2=0.884. se percent 17.3.

• Pine function no. 16. n=352, R^2=0.904, se percent 16.1

• Pine function no. 17. n=352. R^2=0.893, se percent 16.9.

Value

Annual volume-increment percentage for next five year period.

Source

Nyyssönen, A., Mielikäinen, K. 1978. Estimation of stand increment. Act. For. Fenn. 163. ISBN 951-651-038-8.

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