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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #42

Understory Vegetation and Changes in a Virgin Forest
To describe changes in tree reproduction, shrubs, and herbs in the Tionesta Area caused by changes in overstory density, deer browsing, and other factors.
1972 (1942)
expected to continue
Tionesta Scenic and Research Natural Areas, Allegheny National Forest, PA. Forest types are hemlock-beech and northern hardwood.
21 0.001-acre (0.001 ac.) subplots are remeasured on a north-south traverse.
100%
The area is near-virginal.
Field collections for variables are repeated at 10-year intervals, using the same 21 plots. Overstory density and composition are measured also. Photographs are used to compare the present understory with the past, but written records will provide the basis for comparisons in the future.
Seedling counts by species and height class: 1972, 1982, 1992.

Ground cover frequency and coverage records by species, and black-and-white photography collected: 1942, 1947, 1952, 1951, 1962, 1972, 1982, 1992.

Overstory density and composition measured: 1982, 1992.

Data were field checked and data-entry into computer was 100% cross checked with field sheets.
Raw data by plot reside on DG and tally sheets are kept with written instructions and detailed maps to each stand. Annually, the raw data are transformed using the REGEN1 program in DG Info. System. Summarized data by plot and by stand reside in a DG-based program that can output to ASCII text files.
Studies of Ecosystem Processes
unknown
Bjorkbom, J.C.; Larson, R.G. 1977. The Tionesta Scenic and Research Natural Area. Gen. Tech. Rep. NE-31. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.

Hough, AF 1965. A twenty-year record of understory vegetation change in a virgin Pennsylvania forest. Ecology 46: 370-373.

Walters, RS; Nowak, C.A. 1993. Understory vegetation change on the Tionesta Scenic and Natural Area. In: Proceedings, 20th annual natural areas conference: conservation in working landscape; 1993 June 22-26; Orono, ME. Orono, ME. Univ. of Maine.

Susan Stout, USDA, Forest Service, P.O. Box 267, Irvine PA 16329. (814) 563-1040
Allegheny National Forest, PA.

 

  

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