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Effects of Stump Diameter on Sprout Number and Size for Three Oak Species in a Pennsylvania

Effects of Stump Diameter on Sprout Number and
Size for Three Oak Species in a Pennsylvania
Benjamin A. Sands and Marc D. Abrams
In a 2004 clearcut of a former even-aged oak (Quercus) forest, we examined the number and maximum height of stump sprouts for three oak species in
east-central Pennsylvania. The greatest number of sprouts was produced by black oak (Quercus velutina) and chestnut oak (Q. montana) as compared with
white oak (Q. alba). Logistic regression showed that diameter of stumps was a significant factor in determining the probability of sprouting for black oak, and
an inverse relationship between stump diameter and the number of sprouts per stump was found for all three species. The number of white oak sprouts peaked
in the 1020-cm diameter class and declined on larger stumps. The number of black oak sprouts peaked in the 2050-cm classes, and trees in the 7080-cm
class produced the fewest sprouts. The mean annual growth of the tallest sprout on each stump was greater for black oak and chestnut oak than white oak.
Keywords: stump sprout, oak, clearcut, regeneration
ak (Quercus) trees dominate forests throughout much of
the eastern United States. However the ecological integrity
of these forests is in jeopardy due to the multidecadal de-
cline is oak reproduction (Reich et al. 1990, Fralish et al. 1991,
Abrams 2003). This decline is attributed to a multitude of factors
including forest density, light regime, competition from nonoak
species, deer browsing and acorn predation, a lack of understory fire,


Source: Abrams, Marc David - School of Forest Resources, Pennsylvania State University


Collections: Environmental Sciences and Ecology