Forestry Advance Access first published online on February 5, 2008
This version published online on April 17, 2008
Forestry, doi:10.1093/forestry/cpm025
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Rotated sigmoid structures in managed uneven-aged northern hardwood stands: a look at the Burr Type III distribution
1 USDA Forest Service, Northern Research Station, 271 Mast Road, Durham, NH 03824, USA
2 Department of Natural Resources, 221 James Hall, University of New Hampshire, Durham, NH 03824, USA
3 College of Environmental Sciences and Forestry, State University of New York, One Forestry Drive, Syracuse, NY 13210, USA
* Corresponding author. E-mail: jgove{at}fs.fed.us
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Abstract |
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Stand structures from a combined density manipulation and even-to uneven-aged conversion experiment on the Bartlett Experimental Forest (New Hampshire, USA) were examined 25 years after initial treatment for rotated sigmoidal diameter distributions. A comparison was made on these stands between two probability density functions for fitting these residual structures: the Burr Type III and a finite mixture of Weibulls. All stands exhibited some form of uneven-aged structure (either reverse J or rotated sigmoid) after 25 years. The Burr distribution fits the final distributions as well as the more complicated finite mixture model in all cases.