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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 #59

Silvalqual Study
To study the effects of thinning and stand density upon: 1) total wood production per unit area, 2) growth of residual trees and stands and 3) quality of trees in the residual stand.
1975 to 1977
Vinton Furnace Experimental Forest near McArthur, OH. Approximately 39 deg. 11.5 min N lat., 82 deg. 24 min. W. long. Elevation ranges 800' to 900'. Soils are Germano-Gilpin complex with the depth of 'A' horizon ranging from 0" to 11". Texture is sandy to silty loam with frequent rock outcrops. Slopes range from 6% to 70%.
5 separate substudies were established and each used a slightly different statistical design. In general the substudies included 15 to 40 0.1- to 0.001-acre measurement plots.
The following is a sample substudy statistical design. 20 0.1-acre plots all located within the Vinton Furnace Experimental Forest. A 33'-wide isolation strip, an area treated the same as the plot, surrounds each treatment boundary.
Stands were previously disturbed by cutting practices or fire prior to 1950s. The experimental treatments varied per substudy.
The following is a sample substudy treatment plan. Plots were grouped by stocking level into irregularly shaped treatment blocks. Stocking levels were determined by a tree area ratio equation. Plot treatments were: 
1) 30% stocking - 5 plots 
2) 45% stocking - 5 plots 
3) 60% stocking - 5 plots 
4) 100% stocking (controls) - 5 plots 
Camera points for plot photographs were established and photos taken: 1975.
Data collected are divided into two principal areas: 1) Tree Growth/Volume (represented by species, d.b.h., crown class, and total height) and 2) Tree Grade/Quality (represented by species, d.b.h., total height, crown class, live crown ratio, height to first fork, actual and potential tree grade, surface defects by grading section, sweep and percent cull/rot). Understory/Reproduction was sampled by one substudy.
The following variables were measured in each substudy at different dates. d.b.h. (to the nearest 0.1") for several years, crown class, total height, height to 1st fork, surface defect by grading section, live crown ratio, cull and % sweep and rot.
Field data are verified when entered into computer. Field crews were trained by experienced field personnel.
Available data are maintained in an ORACLE database (SASQUATCH) according to the following categories: study description, stand density plot data, plot history, plot summaries, ingrowth summaries, plot treatments, species descriptions, ecological data, size of opening data. Hardcopy of some tally sheets are maintained in file cabinets.
Studies of Ecosystem Processes 
Landscape Scale Studies
Establishment report. 
The above are office reports of U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, Warren, PA.

Hilt, D.E.; Dale, M.E. 1987. Effects of precommercial thinnings on diameter growth in young central hardwood stands. In: Proceedings, 6th central hardwood forest conference; 1987 February 24-26; Knoxville, TN. Knoxville, TN: University of Tennessee, Department of Forestry, Wildlife and Fisheries. 179-185.

Dale, M.E.; Sonderman, D.L. 1984. Effect of thinning on growth and potential quality of young White oak crop trees. Res. Paper NE-539. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 12 p.

Dan Yaussy, USDA Forest Service, 359 Main Road, Delaware, OH 43015. (740) 368-0093



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