[R] nested ANCOVA

["Jörn Buse"]

Dear R-users,

is there a chance to do an nested ANCOVA in R? I've read the archive mails
but it doesn't work.
We have the following situation:

We are interested in differences in carabid biomass at different aged 
woodlands. Thus, we have a nested design with 2 fixed groups (0=recent,
1=ancient) and 10 woodlands (each with 8 replications/traps) per fixed
group. Woodland is therfore nested within the fixed variable. In an
additional step we want to calculate these procedure with a covariate called
beech (this means the percentage of beech in these woods).
Our approach: lme(biomass~age, random=~woods/age)?
What is the syntax for this model in R?

Thanks

Jörn Buse
PhD Environmental Sciences
University of Lueneburg
Germany

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