This is a question better for carry okie. He sent me this link, too. :
" Whats the BSA target for those areas?
The upper midwest its over 80 (USFS and States), which is far to much. 70 (private and timber co's)is by far a better target."
http://www.freerepublic.com/focus/f-news/1008628/posts
fact; Harvesting and tree lenght skidding of the harvested timber simulates burn. As long as they skidd it DOWNHILL and not up.
Now there are some species that do not do well under tree lenght skidding harvesting. Its a matter of common sense.