[R] nested ANCOVA

[Richard M. Heiberger]

There isn't enough detail to be sure I understand your situation
completely.  My first response would be to try something like

carabid.aov <- aov(biomass ~ beech + age + Error(woods/age), data=carabid)

I don't understand from your description where the traps fit into
the model.

Please send to the list the ANOVA table that you are looking for and
then someone can tell you the syntax to get it.