YieldTable_Spruce_VV: Yield table of Norway spruce

In ForModLabUHel/Rprebasso: PRELES, YASSO and PREBAS models

Yield table of Norway spruce

Description

Computing the temporal development of stand characteristics in Norway spruce with the models by Vuokila & Väliaho (1980)

Usage

YieldTable_Spruce_VV(H100, T0, H0, N0, G0, Tn, thin.n, thin.times, thin.ints)

Arguments

H100	Bonity class (Site Index)
T0	Initial Biological age (a)
H0	Initial Dominant height (m)
N0	Initial Number of stems (/ha)
G0	Initial Basal area at breast height WITH BARK (m2/ha)
Tn	Rotation length (biological age in the end of the rotation, a)
thin.n	Number of thinnings; if no thinnings are performed, set thin.n <- 0 and thin.times <- NULL
thin.times	Timing of thinnings (in years of age)
thin.ints	Intensities of thinnings (relative amount of removal IN STEM VOLUME WITH BARK); if no thinnings are performed, set thin.ints <- NULL

Value

A dataframe of yield table for Norway spruce.

• T - Biological age (a)

• H - Dominant height (m)

• N - Number of stems (/ha)

• G - Basal area at breast height WITH BARK (m2/ha)

• Gu - Basal area at breast height WITHOUT BARK (m2/ha)

• V - Stem volume with bark (m3/ha)

• Bperc - Volume without bark per volume with bark (

• vbar - Mean size of stem (dm3)

• S - Sawtimber volume with bark (S, m3/ha).

• F - Pulpwood volume with bark (FF, m3/ha; minimum top diameter 6 cm)

Examples

The default setting of 5 yield tables, site index from 33 to 21.
The variables H100, T0, H0, N0, G0 are recommended to use these default settings.

   YieldTable_Spruce_VV(H100=33,T0=15,H0=5.7,N0=2200,G0=4.9,
                      Tn=110,thin.n=3,thin.times=c(50, 65, 85),thin.ints= c(0.30, 0.30, 0.30))

   YieldTable_Spruce_VV(H100=30,T0=20,H0=7.0,N0=2200,G0=7.4,
                      Tn=110,thin.n=3,thin.times=c(50, 65, 85),thin.ints= c(0.30, 0.30, 0.30))

   YieldTable_Spruce_VV(H100=27,T0=25,H0=7.7,N0=2000,G0=8.4,
                      Tn=110,thin.n=3,thin.times=c(50, 65, 85),thin.ints= c(0.30, 0.30, 0.30))

   YieldTable_Spruce_VV(H100=24,T0=25,H0=5.9,N0=2000,G0=3.1,
                      Tn=110,thin.n=3,thin.times=c(50, 65, 85),thin.ints= c(0.30, 0.30, 0.30))

   YieldTable_Spruce_VV(H100=21,T0=30,H0=6.0,N0=1800,G0=1.9,
                      Tn=110,thin.n=3,thin.times=c(50, 65, 85),thin.ints= c(0.30, 0.30, 0.30))

ForModLabUHel/Rprebasso documentation built on April 13, 2025, 10:48 a.m.