CTFS.growth {CTFS} | R Documentation

## Overview of Analysis of Growth Rates in Tropical Tree Populations

### Description

Provides an overview for the analysis of growth rates for tree populations by a variety of categories including the functions that are available, supporting functions and ways for using the options of the main functions.

### Details

FUNCTIONS TO COMPUTE GROWTH RATES

`growth` | Annual Growth Rates by Categories (User defined groups)
`growth.dbh` | Annual Growth Rates by DBH Classes
`growth.eachspp` | Annual Growth Rates by Species
`growth.indiv` | Annual Growth Rates for each Tree

FUNCTIONS FOR FORMATTING RESULTS

`assemble.demography` | Reformat the Output from Demographic Functions from List to Dataframe
`assemble.table.each` | Reformat the Output from Demographic Functions from List to Dataframe

LIST OF FUNCTIONS CALLED BY USER FUNCTIONS

`rndown5` | Rounds down DBH where measurement was less precise than 1 mm
`trim.growth` | Removes extreme values of growth using user defined limits
`fill.dimension` | Fills all the dimensions of a 2 dimensional array
`fill.1dimension` | Fills all the dimensions of a 1 dimensional array

COMPUTATION OF GROWTH

The annual growth rate for a single tree is computed as:

growth = ( dbh1 - dbh0 ) / (time1 - time0)

where `dbh0` and `dbh1` are the diameters of the tree at the initial and subsequent census, respectively;
where `time0` and `time1` are the census dates for the initial and subsequent census, respectively expressed in years;
The mean growth rate, `meangrow`, is the mean of the growth rate for all trees in the population as defined by the provided file. The mean growth rate is expressed in mm per year.
The relative growth rate for a single tree is computed as:

RGR = ( logdbh1 - logdbh0 ) / (time1 - time0)

with variables as described above.
The mean relative growth rate, `meanRGR`, is the mean of the relative growth rate for all trees in the population as defined by the provided file. The mean relative growth rate is expressed as 1 / years.
The `meandbh` and `meantime` is the mean of the dbh and census intervals, respectively, for the trees used for the mean growth rate computation.
Before computing the growth rate, the ``status'' of a tree is determined. The tree must have been recorded as ``A'', alive at both censuses. Therefore, recruits and trees that died are not used for computing growth rates. Also, the time of the census must be recorded for both censuses.
The 95% confidence intervals are computed using a t-distribution.

### Author(s)

Rick Condit and Pamela Hall

### See Also

`CTFS.groupcats`

[Package CTFS version 1.00 Index]