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Go to:16. Applying Group Selection in Central Appalachian Hardwoods

Go to:18. Clear-cut Studies

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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #17

Thinning Study
To determine and demonstrate costs and returns of selective alternative management programs in northern hardwoods.
expected to continue
Bartlett Experimental Forest. Compartment 22. 
North-facing slope of 20-25% at ~1100' elev. Soil: Hermon stony, sandy loam and well-drained podzol derived mainly from granite and granitic gneiss glacial till. Paper birch site index is estimated to be 70' at 50 years.
Original stand was typical of old-growth northern hardwoods, containing 61% beech, 15% yellow birch, 15% sugar maple, and 9% red maple, ash, paper birch, and other species.
20 0.25-acre plots separated by 1-chain isolation strips. 5 blocks of 4 plots each.
Prep: 1933-35 clear-cut 25 year-old northern hardwood 22-acre stand. After crop trees were selected and marked, 1 of 4 treatments was randomly assigned to the plots in each block: 1) heavy crop-tree thinning, 2) light crop-tree thinning, 3) species thinning, 4) control plots where no trees were removed: 1959
~100 crop-trees were selected in each plot, or 400 per acre to permit detailed evaluation of individual tree development.
Prior to 1959 (cutting): 100% tally of crop trees of entire stand >0.5" d.b.h. (tally also made for trees removed in the thinning.) 100% stand tally of crop trees >0.5" d.b.h were measured to the nearest 0.1". For each crop tree species present on each plot, 4 trees were selected at random and measured for: d.b.h. and diameter at top of the 1st 16-foot long, live crown length (1964 only), crown area (basal area of crown projection), crown volume (crown area times crown length), crown class, crown vigor, clear length of bole (height to 1st live or dead branch, excluding epicormics), number and location of branches, epicormic branches, and bole defects, bole quality class: 1959, 1964, 1969, 1975, 1990 
    Number of trees per species, and d.b.h.: 1969. 
    Number of trees per species, d.b.h., and percentage composition/acre: 1975.
    100% remeasurement tally: tree species, counts, and d.b.h.: 1990.
The crop trees have either 1 or 2 painted blue rings near breast height for identification. Tally was recorded on portable data recorder (Omnidata Polycorder) by plot and species: July, 1990. Plot corners were restaked, plot boundaries and study trees were marked: July, 1990.
DG; some summarized but unanalyzed.
Studies of Ecosystem Processes
Model Development and Application
D. Marquis. 1969. thinning: in Young Northern hardwoods: 5-year results. N NE-139. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.

D. Marquis. 1967. clearcutting in northern hardwoods: results after 30 years. Res. Paper NE-85. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.

W. Leak, M.S. Smith. 1997. Long-term species and structural changes. For. Ecol. 95(1):11-20.

W.Leak, D. Solomon. 1997. Long-term growth of crop trees. N.J. AF. (In press)

William Leak, USDA Forest Service, P.O. Box 640, Durham NH 03824. (603) 868-7655



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