Tree species can “migrate” naturally about thirty miles a century. If climate change happens faster, some may be unable to make the trip in time.
Humans, however, have already moved species. Loblolly pines, for example, have been successfully planted in large numbers significantly north of their natural range and I have seen stands of bald-cypress in Minnesota. They do not naturally regenerate that far north, but they are there – waiting – if climate change makes conditions appropriate. We may well see new associations.
Anyway, we are going to be taking part in an experiment, whether or not we want to do it. We have to think 30-50 years in the future and anticipate that the future may not be like the past.
Reference – http://www.nrs.fs.fed.us/pubs/43455
Uneven aged management
Reference – http://www.nrs.fs.fed.us/pubs/46392