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Go to:56. Effect of Lime, Fencing, and Herbicides on Establishment and Growth of Regeneration on Problem Sites

Go to:58. Crop Tree Versus Area-Wide Thinning

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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #57

Regeneration and Growth After Thinning in Hemlock-Hardwood Stands
To characterize a) growth of residual trees and stands and b) regeneration after thinning treatments involving differing levels of felling unmerchantable hemlock.
Allegheny National Forest, Marienville Road. Forest type is oak-hemlock.
One block of oak-hemlock is fenced and contains 4 2-acre treatment areas. A 0.6-acre measurement plot is in each treatment area. All treatments were replicated once inside and once outside a fence. 12 0.0026 Subplots were established to monitor regeneration.
One of the 4 treatment areas was left uncut as the control area. The remaining 3 were thinned: 1) conventional shelterwood cut to 75% residual density, 2) shelterwood cut to 90% residual density including 20% understory hemlock, 3) shelterwood cut to 60% residual density with all understory hemlock removed.
Within each measurement plot, individual hemlock trees with diameters > 2.5 were measured to the nearest 0.01" at the beginning of the study (1989) and at 5-year intervals thereafter. At each measurement period, a subsample of the largest hemlock and hardwood trees per treatment were assessed for crown class. In each treatment area, trees from 0.5" to 2.50" d.b.h. were measured on 12 6' radius plots. Immediately before and 2 and 5 years after treatment, detailed regeneration data were collected on these plots.
Stand basal area growth are analyzed using initial basal area, species composition and relative density as the independent variables. In the regeneration portion of the study, number and height of seedlings by species are analyzed for significant differences between overstory treatments. Herbaceous cover is also measured in the regeneration plots. 1989, 1991, 1994.
Data were field checked and data-entry into computer was 100% cross checked with field sheets.
Raw data by plot reside on DG and tally sheets are kept with written instructions and detailed maps to each stand. Annually, the raw data are transformed using the REGEN1 program in DG Info. System. Summarized data by plot and by stand reside in a DG-based program that can output to ASCII text files.
Studies of Ecosystem Processes
none to date
Susan Stout, USDA, Forest Service, P.O. Box 267, Irvine PA 16329. (814) 563-1040
Allegheny National Forest, PA.



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