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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #27

Density Study
To evaluate tree growth response to different silvicultural treatments and varying stand structure.
1964
expected to continue
Bartlett Experimental Forest. Prior to cutting, stand was a second-growth northern hardwood stand primarily composed of beech, red maple, and paper birch, with some sugar maple and yellow birch, and a few white ash and other species.
Randomized block design. 12 0.33-acre plots replicated 4 times for a total of 48 plots each surrounded by a 50' wide treated isolation strip and each given a separate treatment. Each plot received a separate treatment.
100%
Each plot was assigned at random one of four stand densities (100, 80, 60, and 40 square feet of basal area per acre in trees > or = 4.5" d.b.h.). Within each level of residual stand density, 3 levels of residual stand structure were randomly assigned: 30%, 45%, and 60% sawtimber (trees > or = 10.5" d.b.h.). 
Trees were originally removed: autumn, 1963; spring, 1964. 
Trees were again removed at year 25: 1989.
Basal area growth is averaged for the 4 plots that received each treatment and then placed on an annual basis for comparison with gross growth, production, accretion, ingrowth, and mortality. The diameter growth per tree was computed on an annual basis by species for each treatment. The diameter growth per tree was then computed separately for survivor trees, ingrowth trees, and trees that died during the study.
100% tally on all 0.33-acre plots:1964
Tree counts by species, tree height and maturity development: 1964, 1967, 1972, 1974, 1979, 1984, 1994. 
Crown width and height: 1990. 
Independent: residual basal area, residual basal area squared, % sawtimber, and the interaction of residual basal area and % sawtimber. Tree measurements include: d.b.h., height growth and mortality: 1967, 1969, 1972, 1974, 1990.
A battery operated recorder, with internal checks, was used to record data in the field. Computer program in lab checks data as it is entered.
Analyzed - 1 9-track tape in ASCII.
Studies of Ecosystem Processes
partially 1994
Solomon, D. S. 1977. The influence of stand density and structure on growth and northern hardwoods in New England. Res. Paper NE-362. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 13 p. 

Leak, W.B.; Solomon, D.S. 1975. Influence of residual stand density on regeneration of northern hardwoods. Res. Paper NE-310. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.

Solomon, D.S. 1977. Growth rates of northern hardwoods under uneven-age management. The Northern Logger and Timber Processor. 25(8):18, 38.

Linda Heath, USDA Forest Service, P.O. Box 640, Durham NH 03824. (603) 868-7666 
none 

 

  

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