I'd think you'd get a more reliable rate of grade improvement with
intensive stand improvement. A thinning at 20 years just doesn't get us
(PNW) enough cleanup to compensate for bear damage, mistletoe, rough,
windshake, snow break, internal rot etc. Especially since the above may
or may not be localized phenomena. As stand management improves
forecasting grade increase will improve.
A limby 6" dib #3 saw Pulp sort hemlock may grow into 12" dib limby #3
saw Pulp. Douglas Fir, Red Alder and true firs certainly clear better
than Hemlock and Cedar but it's dependant on SO many factors: forest
practices, site, exposure...
A cruise card with extra blanks for those individuals likely to improve
grade comes to mind.
>> In article <35E42FD6.C321C183 at olympus.net>, Mike Hagen <mhagen at olympus.net>
>> >So how can you forecast grade improvement when it's not just based on
> >diameter? Statistical ranges? Has anyone worked with Jim Arney's
>> With Southern Yellow Pine, it is not as much a matter of grade improvement as
> growth into a higher value product class. Pulpwood into CNS, or CNS into
> sawlogs or peelers. Diameter is pretty much the limiting factor as long as the
> tree has good form.
>> Bob Miller
> Alabama Registered Forester
>> ~~~> The forest may be quiet, but that doesn't mean all the snakes have left.