spp.randarea.range {CTFS} | R Documentation |
spp.randarea.range(census1, quadside = 100, shape = 1, alivecode=c("A"), mindbh = NULL, plotdim = c(1000, 500), replicates = 10, unidennames = c("**", "UNID", "uniden", "UNIDEN"))
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 |
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.
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 |
Rick Condit, Suzanne Lao and Pamela Hall
## 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)