Chop down trees

From DwarfFortressWiki

This designation is used for cutting down trees in order to obtain wood. All trees in the designated area are flagged to be cut down by a dwarf with the wood cutting labor enabled. Individual trees can also be designated for removal simply by making the designated area only as big as a single tree. Cutting down trees requires a battle axe.

Once a tree has been cut down, a log will be produced, which can be hauled away by a dwarf with the wood hauling labor enabled.

Note that saplings cannot be cut down; only mature trees can be designated. While primarily used above ground, this designation can be used underground if an underground forest is discovered.

To designate an area for cutting down trees, hit the d key, followed by t.