||
library(vegan)
data(dune)
data(dune.env)
## step基于AIC值
step(cca(dune ~ 1, dune.env), reformulate(names(dune.env)), test="perm")
##ordistep基于P值
ordistep(cca(dune ~ 1, dune.env), reformulate(names(dune.env)), perm.max=200)
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