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Abstract
Two biological growth functions, an exponential-monomolecular function and a simple monomolecular function, have been fit to published site index curves for 11 Lake States tree species: red, jack, and white pine, balsam fir, white and black spruce, tamarack, white-cedar, aspen, red oak, and paper birch. Both functions closely fit all published curves except those for white spruce and are recommended for use wherever mathematical functions can be conveniently used. A table of height factors is presented to simplify hand calculations of height and construction of new site index curves from these equations.
Keywords
site index curves,
Lake States,
red pine,
jack pine,
white pine,
balsam fir,
white spruce,
black spruce,
tamarack,
white cedar,
aspen,
red oak,
paper birch
Citation
Lundgren, Allen L.; Dolid, William A. 1970. Biological growth functions describe published site index curves for Lake States timber species. Research Paper NC-36. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station
