Increasing Aspen Production through Mechanical Strip-Thinning (December 1, 1993-May 31, 1994): Monitoring Report
1994
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Increasing Aspen Production through Mechanical Strip-Thinning (December 1, 1993-May 31, 1994): Monitoring Report
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1994
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University of Minnesota, Duluth
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Technical Report
Abstract
This project has five primary research tasks related to the determination of growth and yield of
aspen in response to mechanical strip-thinning; analysis of disease incidence in thinned and
unthinned stands and determination of the costs and economic feasibility of mechanical stripthinning
of aspen. All activities for the 1993 growing season related to data collection are
complete. The average diameter growth rate of the 200 largest trees in the network of new
experiments is approximately 25 percent greater in thinned stands compared to unthinned stands
on the same site. Laboratory analysis of soils were completed on all samples to complete that
soils database for Task II studies. Measurement of tree growth and analysis of the older
previously-thinned stands on the Chippewa National Forest are complete (Task III). Stand 3,
which was thinned at age 11 and is now 25 years of age has 17. 9 merchantable cords standing
volume per acre compared to an adjacent unthinned area which has 9.3 cords per acre. Stand
7, which was thinned at age 12 and is now 21 years old has 5.5 cords of merchantable volume
per acre compared to 3. 3 in unthinned areas. An inventory of disease was done at Stand 3 and
on one site on Blandin Paper Company land. Disease incidence on all plots will be measured
this summer on the recently established studies. Economic analyses (Task V) were updated to
reflect the rapid changes in aspen stumpage. Assuming a stumpage price of $22 per cord, the
net present value (NPV) of thinned aspen is $429 per acre versus $168 for a no-thinning option;
a difference of approximately $261 per acre.
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Grant No. GR91-00044
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Berguson, William E. (1994). Increasing Aspen Production through Mechanical Strip-Thinning (December 1, 1993-May 31, 1994): Monitoring Report. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/256866.
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