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Go to: 87. Effects of Defoliation by Gypsy Moth on Stump Sprouting of Mixed Oak Stands

Go to:89. Urban-Rural Gradient Ecology Program (URGE)

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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #88

Effect of Overstory Density and Understory Control on the Establishment and Growth of Oak (Study 108)
To observe long term impacts of forest regeneration under various overstory densities.
expected to continue
Athens Ranger District - Wayne National Forest, OH. 
Township and range coordinates are available. 
Upland mixed oak transition and mixed oak-hickory stands located on the Allegheny Plateau and adjacent areas.
Split plot with randomized complete blocks. 8 regeneration plots (0.0026 acres each) in 36 stands replicated by treatment and site index. 
Treatment plot size: 2-acres (0.6-acre measurement with 1 chain buffer).
Total regeneration treatment plots: 288. Overstory densities were managed in the main plots, understory control measures occurred in the subplots.
Shelterwood cuts to 40% and 60% relative density with understory treatment by fire and herbicide. Each block consists of 4 or 5 overstory density treatments: uncut control; shelterwood cut, residual stocking-60%; shelterwood cut, residual stocking-40% after 5 years; clear-cut and 3 methods of understory control: untreated control; prescribed burned, repeated 3 to 5 year intervals as needed. The main plots contain overstory density treatments and subplots contain the understory control methods. Note: Clear-cut never installed, 60-40 2-cut shelterwoods not completed, understory treatments were never repeated.
Long Term Layout/Design: Regeneration plots - 8 6' radius plots in 36 stands replicated by treatment and site index. Silvah is used to summarize 100% stem tally for all trees > 0.6" d.b.h. that were measured.
Seedling counts made by species and height classes <1.0', 1.0'-3.0', 3.0'-5.0', >5.0'. and herbaceous cover measured: 1981, 1983, (pretreatment), 1985 by Russell Walters. 10-yr regeneration: 1992

Independent: overstory density levels, understory control method.

Dependent: % stocking and sp. composition of regeneration, height, diameter, origin, and vigor of regeneration, and amount of competition and resprouting of understory. Seedling counts made by sp. and height classes <1', 1'-3,3'-5', >5'. Herbaceous cover measured: 1985. Note: after 1993 expect continuation for regeneration surveys only.

The 1992 data was field checked and all data entered into computer is 100% cross checked with field sheets. Backups are stored in fireproof safe. Plant identification training was given to field crew members.
Raw on paper and floppy disk. Silvah, Symphony (spreadsheet), and SAS were the analysis programs used with data. 2 high density (1.4 meg.) diskettes in fireproof safe. Hardcopies filed in Morgantown. All backup diskettes in fireproof safe.
Studies of Ecosystem Processes 
Model Development and Application
Doctoral Dissertation. 
Some summarizations and conclusions written by Russ Walters. U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, Warren, PA.
Kurt Gottschalk, USDA Forest Service, 180 Canfield St., Morgantown WV 26505-3101. (304) 285-1598
Phil Perry with Wayne National Forest in Athens Ohio.



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