Good question. There is quite a lot of work going on in the realm of forest and fire archaeology. Here is the best reference of which I am aware (it's a VERY expensive book):
Bonnicksen, Thomas M.; Department of Forest Science, Texas A&M University; AMERICA’S ANCIENT FORESTS, From the Ice Age to the Age of Discovery; John Wiley & Sons, Inc.; 2000.
Thank you for the reference. It's an immensely interesting topic and weeding out the "unnatural" impact of man from "natural" cycles and progressions is a difficult puzzle.