SNPsm: The spatial and temporal model of succession in the Swiss...

In dave: Functions for "Data Analysis in Vegetation Ecology"

Description

A dynamic model of succession on alp Stabelchod in the Swiss Nationl Park using differential equations and numerial integration. 6 species guilds are considered. Space is conceived as a grid of 30 times 40 cells. Typical simulation time is around 500yr.

Usage

SNPsm(trange,tsl,diff,r6,...)
SNPsm2(trange=100,tsl=5.0,diff=0.001,r6=NULL)

## Default S3 method:
SNPsm(trange, tsl, diff, r6, ...)
## S3 method for class 'SNPsm'
plot(x, ...,out.seq=1,col=FALSE)

Arguments

trange	Time range of simulation in yr
tsl	Time range of simulation in yr
out.seq	Time interval (yr) at which maps of the state are printed
diff	A diffusion coefficient driving random spatial propagation
r6	Growth rates of 6 guilds involved, increase in cover percentage per yr
...	Parameter out.seq, the plotting interval
x	An object of class "SNPsm"
col	A logical variable to suppress color printing

Value

An object of class "SNPsm" with at least the following items:

n.time.steps	Number of time steps used for numerical integration
imax	Vertical grid count
jmax	Horizontal grid count
time.step.length	The time step length in yr
veg.types	The names of the vegetation types, i.e., the species
vegdef	A nspecies x nspecies matrix defining composition of vegetation types
growth.rates	The growth rates given upon input
sim.data	Simulated scores of all species (guilds) during simulation time
tmap	The 30 x 40 grid map of types used as initial condition
igmap	The same as tmap
frame	A 30 x 40 grid showing initial forest edges, used for printing

Author(s)

Otto Wildi

References

Wildi, O. 2002. Modeling succession from pasture to forest in time and space. Community Ecology 3: 181–189.

Wildi, O. 2017. Data Analysis in Vegetation Ecology. 3rd ed. CABI, Oxfordshire, Boston.

Examples

r6=NULL           # imposes default growth rates
o.stSNP<- SNPsm(trange=100,tsl=10.0,diff=0.001,r6)
plot(o.stSNP,out.seq=50)

dave documentation built on May 2, 2019, 1:30 p.m.