spp.randarea.range {CTFS}R Documentation

Number of Species in Randomly Selected Areas of Various Shapes and Sizes

Usage

spp.randarea.range(census1, quadside = 100, shape = 1,
        alivecode=c("A"), mindbh = NULL, 
        plotdim = c(1000, 500), replicates = 10, 
        unidennames = c("**", "UNID", "uniden", "UNIDEN"))

Arguments

census1 name of census datafame for a single census
quadside vector of dimensions (x) of the randomly selected area in meters
shape vector of integers, factor used to determine dimension y of quadrate. for a square, shape = c(1)
alivecode character, codes of the variable status that indicate the tree is alive. The most general valid categories are: "A" and "AB" and "AS". The default for abundance is "A"
mindbh Minimum DBH for computing population size in each census
plotdim plot dimensions, x,y lengths in meters
replicates number of randomly selected areas to sample
unidennames vector of codes for unidentified species, codes vary among sites and datasets

Details

spp.randarea.range produces a list and a graph. The number of species and area of each replicate is graphed. The graph can be saved using the File menu.

quadside and shape must be vectors of equal length, for which each value in shape is paired with a value in quadside of the same location in its respective vector. When these vectors are of unequal length, unexpected results including failure to execute, can occur.

Pay attention to the default values of alivecode and mindbh. Any tree with alivecode not equal to “A” has a dbh = NA and so will not contribute to the results of this computation. Setting mindbh to some value other than NULL will affect the trees that are included in the calculation. Use mindbh to select trees larger than 10 mm dbh. Use alivecode to select trees to be counted as being alive but have no dbh measurement.

Value

spp.randarea.range returns a list with 2 components

spparea a dataframe of the mean and standard deviations of the number of individuals and species of the randomly selected areas. spparea contains:
full a dataframe of the values for each replicate. full contains:

area area, in hectares, of replicate
n.ind number of individuals in replicate
n.spp number of species in replicate

Author(s)

Rick Condit, Suzanne Lao and Pamela Hall

See Also

CTFS.diversity

Examples

## Not run: 
1.  produces a species area curve in about 2 minutes
quadside=c(1,10,20,30,40,50,60,70,80,90,100)
spp.area.out <- spp.randarea.range(bci90.full,quadside=quadside,replicates=2)
  
## End(Not run)

[Package CTFS version 1.00 Index]