nordlarsen2009: Site-specific height growth models for six common tree...

In Silviculturalist/forester: Forest Science and Forestry

Site-specific height growth models for six common tree species in Denmark.

Description

Site-specific height growth models for six common tree species in Denmark.

Usage

NordLarsen_2009_height_trajectory_Denmark_Beech(
  dominant_height,
  age,
  age2,
  output = "Height"
)

NordLarsen_2009_height_trajectory_Denmark_Beech(
  dominant_height,
  age,
  age2,
  output = "Height"
)

NordLarsen_2009_height_trajectory_Denmark_Oak(
  dominant_height,
  age,
  age2,
  output = "Height"
)

NordLarsen_2009_height_trajectory_Denmark_Norway_Spruce(
  dominant_height,
  age,
  age2,
  output = "Height"
)

NordLarsen_2009_height_trajectory_Denmark_Sitka_Spruce(
  dominant_height,
  age,
  age2,
  output = "Height"
)

NordLarsen_2009_height_trajectory_Denmark_Silver_Fir(
  dominant_height,
  age,
  age2,
  output = "Height"
)

NordLarsen_2009_height_trajectory_Denmark_Douglas_Fir(
  dominant_height,
  age,
  age2,
  output = "Height"
)

Arguments

dominant_height	Dominant height of stand, m.
age	Total age.
age2	Total age at output age.
output	One of "Equation" or "Height".

Details

Beech: R^2=0.991, RMSE cross-validation 1.619

Oak: R^2=0.990, RMSE cross-validation 1.269

Norway Spruce: R^2=0.982, RMSE cross-validation 1.740

Sitka Spruce: R^2=0.984, RMSE cross-validation 1.583

Silver Fir: R^2=0.989, RMSE cross-validation 1.263

Douglas Fir: R^2=0.989, RMSE cross-validation 1.894

Value

m.

Source

Thomas Nord-Larsen , Henrik Meilby & Jens Peter Skovsgaard (2009) Site-specific height growth models for six common tree species in Denmark, Scandinavian Journal of Forest Research, 24:3, 194-204, DOI: https://doi.org/10.1080/02827580902795036

Examples

# A ggplot of some common site indices for Beech in Denmark.
ggplot()+
geom_function(fun=function(x) NordLarsen_2009_height_trajectory_Denmark_Beech(dominant_height = 10,age=50,age2 = x))+
geom_function(fun=function(x) NordLarsen_2009_height_trajectory_Denmark_Beech(dominant_height = 15,age=50,age2 = x))+
geom_function(fun=function(x) NordLarsen_2009_height_trajectory_Denmark_Beech(dominant_height = 20,age=50,age2 = x))+
geom_function(fun=function(x) NordLarsen_2009_height_trajectory_Denmark_Beech(dominant_height = 25,age=50,age2 = x))+
geom_function(fun=function(x) NordLarsen_2009_height_trajectory_Denmark_Beech(dominant_height = 30,age=50,age2 = x))+
xlim(c(0,125))+
ylim(c(0,35))+
coord_cartesian(ylim=c(0,40))

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