pick.dbh {CTFS}R Documentation

Determine the Appropriate DBH to Use for Computation of Above Ground Biomass

Description

These functions are called from biomass. Given the parameter values provided by biomass the dbh of tree with a suspect growth rate is set in order to have a reasonable estimate of the growth rate. The growth rate estimations can have a very large effect on the final above ground biomass for the entire site. Use badgrowth.tree to generate a file of the trees with estimated dbh as determined by pick.dbh.

Usage

pick.dbh(census1, census2, badgrowth = "keep", 
        dbhuse = "second", trim = c(-5, 75), recsize = 110, rounddown = FALSE)  

Arguments

census1 name dataframe of first census, must be of same length as census2
census2 name dataframe of second census, must be of same length as census1
badgrowth how to treat growth rates that are determined as too high or low by trim values. Valid values are: keep for retaining all growth rates regardless of value, i.e. trim limits are not applied; nogrowth set growth rates to 0; meangrowth set growth rate to the mean growth for the dbh category of the tree; trim set growth values to trim maximum or minimum if it exceeds or is less than the values for trim.
dbhuse for trees with “bad” growth, identify which dbh to trust, then use this dbh to apply the rules selected for badgrowth.tree.
trim limits of acceptable growth minimum and maximum
recsize the maximum DBH (mmm) a recruit to the second census that is considered appropriate, a very site and species specific value that should be carefully determined by the user.
rounddown rounding rules for the first and second censuses at Pasoh

Details

This function is only called by calc.neighborhood.sp and is used internally.

Value

pick.dbh returns a list of:

dbh1 dbh in census1 as determined by pickdbh
dbh2 dbh in census2 as determined by pickdbh
GRm growth (mm/year) of the main stem


gr.raw returns a vector of growth rates without adjustment.

Author(s)

Pamela Hall

See Also

CTFS.biomass, biomass


[Package CTFS version 1.00 Index]