BAmodule: Predicts and/or projects stand Basal Area (BA) from...

In sgezan/Nothopack: G&Y Forest Simulator for Roble-Rauli-Coigue Stands in Chile

Description

Evaluates stand-level input variables to predict and/or project basal area. Projections are based in 1 year increments.

Usage

BAmodule(
  AD0 = NA,
  HD0 = NA,
  N0 = NA,
  BA0 = NA,
  HD1 = NA,
  N1 = NA,
  model = 1,
  projection = FALSE
)

Arguments

AD0	Dominant age (years) of the stand at current time
HD0	Dominant height (m) of the stand at current time
N0	Number of trees (trees/ha) of the stand at current time
BA0	Basal area (m2/ha) of the stand at current time (required for projections)
HD1	Dominant height (m) of the stand at future projection time (required for projections)
N1	Number of trees (trees/ha) of the stand at future projection time (required for projections)
model	Model to use for estimation (1:non-linear fit, 2:linear fit) (default = 1)
projection	if TRUE projection from BA0 is executed for a 1 year increment

Value

Basal area (BA0, m2/ha) for the current age (for prediction) or at AD0+1 (for projection)

Author(s)

S.A. Gezan, S. Palmas and P. Moreno

References

Gezan, S.A. and Ortega, A. (2001). Desarrollo de un Simulador de Rendimiento para Renovales de Roble, Rauli y Coigue. Reporte Interno. Projecto FONDEF D97I1065. Chile

Examples

# Example 1: Predicts basal area at a certain age AD
BAest <- BAmodule(AD0=20, HD0=17.2, N0=2730, model=1, projection=FALSE)
BAest$BA0

# Example 2: Projects basal area for different models
(BAest <- BAmodule(AD0=20, HD0=17.2, N0=2730, BA0=33.11, HD1=19.1,
                   N1=2610, model=1, projection=TRUE)$BA1)
(BAest <- BAmodule(AD0=20, HD0=17.2, N0=2730, BA0=33.11, HD1=19.1,
                   N1=2610, model=2, projection=TRUE)$BA1)

sgezan/Nothopack documentation built on April 25, 2021, 8:03 a.m.