Topography plays an important role, as well, in what will grow in certain locations such as slope, aspect, and of course elevation (effective climate). In the west and higher elevations of the Rockies it’s easily visible (from the tree line) where growth ends because of frigid temperatures and lack of oxygen at those levels.
Tree diseases also alter forestation and aren’t limited to only certain areas. Who can’t remember, other than our current generation, the wide-scale devastation caused by Dutch elm disease? About the only good that came from this were the massive amounts of morel mushrooms that could be found.
Currently we’re dealing with yet another culprit, the emerald ash bore taking its toll in our surrounding area.
We pray a disease won’t destroy our crown jewels— the mighty sugar maples of Goshen.