From the USDA Forest Service, The State of the Forest

The Highlights of the article
• Statewide, there was no net loss of forestland. However,
certain regions of the Commonwealth are losing forestland to
sprawl and development.
• Private entities own 69 percent of Pennsylvania’s forests,
while public agencies own 31 percent.
• Red maple is Pennsylvania’s most abundant tree species.
Black birch had the largest increase in tree numbers,
surpassing black cherry as Pennsylvania’s second-most
common tree species.
• Tree regeneration is severely lacking and half of
Pennsylvania’s forests are at risk of regeneration failure, due
mostly to white-tailed deer overbrowsing.
• Board foot volume continues to increase. Since the 1989
inventory, all major species increased in volume except sugar
maple and eastern hemlock.

To read the full article go to the link or click the title above
http://www.dcnr.state.pa.us/forestry/documents/PA_DCNR_FIA.pdf