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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #21

Bartlett Cruise Plots
1) To observe how changes in species composition over time relate to environmental factors. 
2) To determine the effects of soils and elevation on species change with particular emphasis on trends in shade-tolerant species.
expected to continue
Bartlett Experimental Forest, NH. 
Soils are derived from granite: Berkshire, Hermon, Becket, Lyman, Peru, Coiton Series and Haplorthods subgroups and are of fine-till, coarse-washed till, dry compact till, bedrock, wet compact till, outwash types. 
Prior to cutting, forest was dominated by Fagus grandifolia, Acer saccharum, Tsuga canadensis, Pinus rubens.
In 1931-1932, stands were between 100 and 150 years old based on age-size regressions. Stands had an overstory basal area between 20 and 30 m2 per hectare implying that cutting histories were not extremely variable. Fire and windthrow damage to area are unknown. Agriculture practice never existed in the area. 
Elevation: 300 to 650 meters.
29 0.25-acre plots that were uncut in Bartlett Experimental Forest.
500 permanent cruise plots were laid out on the Bartlett on a 100 m x 200 m grid: 1931-1932.

Cruise plots were completely or partially cut in conducting other timber management experiments: 1932-1984.

Relocated ~100 plots that had remained uncut and disguarded plots where trees suffered hurricane damage during 1938. Each plot was classified by elevation, soils, tree species composition, and topography: 1984.

Trees <1.5" (3.8 cm) d.b.h. were tallied by 1"(2.54 cm) classes and tree species. Each plot was classified by elevation and habitat (recognized by soil materials, tree species composition, topography).
Summer data collections: 
1st remeasurements (all plots): 1939-1940. 
2nd remeasurement (some plots): 1960. 
All trees >1.5" (3.8 cm) d.b.h. were tallied by 1" (2.54 cm) classes and species: 1984. 
3rd remeasurement (some plots): 1991-1992.
Raw and summarized are on 6 HD diskettes organized by compartment and plot. Backup is on tape and disc. Paradox and Microsoft Excel are used for data record keeping. data are updated ~10 years.
Studies of Ecosystem Processes 
Model Development and Application 
Leak, William B. 1987. Fifty years of compositional change in deciduous and coniferous forest types in New Hampshire. Canadian J. Forestry research 17:388-393.

Leak, William B. 1961. development of second-growth northern hardwoods on the Bartlett Experimental Forest - a 25-year record. Station paper No. 155. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.

Filip, Stanley; Marquis, D.A.; Leak, W.B. 1960. Development of old-growth northern hardwoods on the Bartlett Experimental Forest - a 22-year record. Station Paper 135. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.

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



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