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Go to:88. Effect of Overstory Density and Understory Control on the Establishment and Growth of Oak (Study 108)

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Catalog of Long Term Research Conducted by the Northeastern Research Station

Catalog #87

Effects of Defoliation by Gypsy Moth on Stump Sprouting of Mixed Oak Stands
To study defoliation effects on sprouting capacity, vigor, growth, mortality and regeneration under different silvicultural treatments.
Block 1: 1981 
Block 2: 1983
Block 1: discontinued 1992. 
Block 2: discontinued 1994.
Block 1 Clinton County, PA. 
Block 2 Clear Creek State Forest, Jefferson County, PA.
Split plot with randomized block. A 7.2-acre plot has a 2-chain buffer between measurement areas and surrounding forest. Within the 7.2-acre plot, two areas were designated for measuring: a 2-acre whole plot with 1 area fenced and 1 area unfenced, and a 1-acre split plot fenced.

6' radius plots designed to collect regeneration data in understory: 10 per treatment in block1 and 12 per treatment in block 2.

Design after 1993 following regeneration stand development in clear-cut treatments only: 
Block 1: 4 acres, 2 fenced and 2 unfenced measured annually. 
Block 2: 2 acres, 1 fenced and 1 unfenced: measured annually AND 4 acres, 2 fenced and 2 unfenced measured annually.

Block 1: Clear-cut (1981) , thinning, thinning with Timber Stand Improvement control (1981-1982 after defoliation). 
Block 2: Same treatments replicated as in block 1 without one clear-cut and one thinning cut prior to defoliation in 1984. 
Clearcuts to occur every 10 years. 
Markers replaced: block1: 1992, block 2: 1994.
Tree vigor, d.b.h. and defoliation measurements were taken in overstory. Annual regeneration plots taken in understory for 5 years then at 5-year intervals. 10-year regeneration measurements include 100% inventory of all stems > 0.6" d.b.h.
Independent: cutting method (thin, thin/TSI, commercial clear-cut, complete clear-cut), species, size class, defoliation, deer fencing (first 5-years only).
Dependent: Sprouting capacity, sprouting vigor, sprout mortality (& stump mortality), vigor & mortality of uncut trees and regeneration response.
Measurements schedule: 
Block 1: annually 1981 to 1986 & 1992 (regeneration). 
Block 2: annually 1983-1988 and 1993; 1984-1989 & 1994 (regeneration).
Field data are verified when entered into computer. Missing or inconsistent data are field checked.
All data on diskettes (some summarized and some analyzed).
Studies of Ecosystem Processes 
Model Development and Application
none to date.
Kurt Gottschalk, USDA Forest Service, 180 Canfield St., Morgantown WV 26505-3101. (304) 285-1598
Private landowners 
Hammermill Paper Co. 
PA Bureau of Forestry, Forest Pest Management Division.



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