P. F. NEWTON
respectively, relative to the NC scenario. These declines translated
into decreases in merchantable volume productivity (mean annual
merchantable volume increment) in the order of 19% for the
northeastern stands and 10% for the northwestern stands grown
under the B1 and A2 scenarios. Similar declining trends were evi-
dent for rotational mean sizes (quadratic mean diameter and mean
stem volume), biomass yields (component-specific biomass pro-
duction and carbon outcomes), recoverable end-product volumes
(volume of recoverable chip and lumber volumes), and economic
worth (land expectation value). In addition to providing plausible
site-specific climate change outcomes on jack pine productivity
within the central portion of the species range, the results suggest
that future predictions made under the no change emission scenario
may overestimate merchantable volume productivity on the higher
site qualities by as much as 15%. Consequently, forest managers
should exercise caution when interpreting future long-term yield
forecasts derived from models that have yet to account for climate
change effects.
Acknowledgements
The author expresses his appreciation to: 1) Dr. Sharma, Re-
search Scientist, Ontario Forest Research Institute, Ontario Mi-
nistry of Natural Resources, Sault Ste. Marie, Ontario, Canada,
for providing assess to the biophysical height-age function; 2)
John Parton, Provincial Growth and Yield Modeler, Ontario Mi-
nistry of Natural Resources, South Porcupine, Ontario, Canada,
for provision of constructive input during the early phase of this
study; and 3) to the anonymous reviewers for their constructive
comments and suggestions.
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