dominance: A forest spatial structure index characterizing tree...

In forestSAS: Forest Spatial Structure Analysis Systems

Description

The tree attribute dominance was proposed by Hui et al. (1998) to relate the relative dominance of a given tree to its species or silvicultural significance. It is defined as the proportion of the n nearest neighbours of a given reference tree which are bigger than the reference tree.

Usage

dominance(x)

Arguments

x	A vector composed by 5 tree attributes, such as dbh,biomass.

Value

Result will retrun five values,0,0.25,0.5,0.75,1,which means the propertion of the larger tree attributes in the 4 nearest neighbours than the reference tree.

Author(s)

Zongzheng Chai, [e-mail]

References

Gadow Kv, and Hui GY. 2002. Characterizing forest spatial structure and diversity. Proc of the SUFOR international workshop: Sustainable forestry in temperate regions. p 20-30.

Examples

dbh1<-c(5,4,4,4,4)
dbh2<-c(5,4,4,4,6)
dbh3<-c(5,4,4,7,6)
dbh4<-c(5,4,8,7,6)
dbh5<-c(5,9,8,7,6)

dominance1<-dominance(dbh1)
dominance1
dominance2<-dominance(dbh2)
dominance2
dominance3<-dominance(dbh3)
dominance3
dominance4<-dominance(dbh4)
dominance4
dominance5<-dominance(dbh5)
dominance5

Example output

[1] 0
[1] 0.25
[1] 0.5
[1] 0.75
[1] 1

forestSAS documentation built on May 1, 2019, 10:15 p.m.