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]