mortalityTree: Calculates 5 year mortality rate for tree-species

In hansoleorka/skogR: Norske skogfunksjoner (Norwegian Forestry Functions)

Calculates 5 year mortality rate for tree-species

Description

#' 'Model for survival. Original model by Eid & Tuhus (2005). Later (april 2007) the model was modified to a more simple model and to include basal area. Eid, T. & Tuhus, E., (2005). Models for individual tree mortality in Norway. For. Ecol. Manage. 154: 69-84

Usage

mortalityTree(d, sp, BA)

Arguments

d	Diameter of the single tree at breast height (cm), Diameter (cm)(Publication uses cm, parameter estimate adjusted)
BA	Stand basal area (m2ha-1)
species	species code (1=spruce, 2= pine, 3= brich, 4 = other broadleaves )

Details

Based on SAS code from 'Ole Martin Bollandsås, 16.01.2007

Value

5 year mortality rate

Author(s)

Hans Ole Ørka [e-mail]

References

Vestjordet 1959,Brantseg 1959,Næsset 1994a, Næsset 1995a,b

Examples

sp <- c(1,1,2,4)
d <- c(20,25,10,5)
BA <- 14
mortalityTree(d,sp,BA)
BA <- c(14,14,10,10)
mortalityTree(d,sp,BA)

hansoleorka/skogR documentation built on March 8, 2024, 7:47 p.m.