Composition and tree-size distributions of the Snyder-Middleswarth old-growth forest, Snyder County, Pennsylvania

Castanea, Mar 2003 by Zawadzkas, Peter P, Abrahamson, Warren G

ORWIG, D.A., M.D. ABRAMS, and D.R. FOSTER. 1998. Forest response to the introduced hemlock woolly adelgid in southern New England, USA. J. Torrey Bot. Soc. 125:60-73.

PENNSYLVANIA BUREAU OF FORESTRY. No date. The Bald Eagle State Forest Public Use Map. Commonwealth of Pennsylvania, Department of Conservation and Natural Resources, Harrisburg, Pennsylvania.

ROONEY, T.P. 1995. Restoring landscape diversity and old growth to Pennsylvania's northern hardwood forests. Nat. Areas J. 15:274-278.

ROONEY, T.P. and W.J. DRESS. 1997. Species loss over sixty-six years in the ground-layer vegetation of Heart's Content, an old-growth forest in Pennsylvania, USA. Nat. Areas J. 17:297-305.

RUNKLE, J.R. 1985. Disturbance regimes in temperate forests. p. 17-33. In: Pickett, S.T.A. and P.S. White (eds.). The ecology of natural disturbance and patch dynamics. Academic Press, New York, New York.

SAXTON, K.E., W.J. RAWLS, J.S. ROMBERGER, and R.I. PAPENDICK. 1986. Estimating generalized soil-water characteristics from texture. Soil Sci. Soc. Am. J. 50:1031-1036.

SMITH, T.L. 1989. An overview of old-growth forests in Pennsylvania. Nat. Areas J. 9:40-44.

SPIES, T.A. and J.F. FRANKLIN. 1988. Old growth and forest dynamics in the Douglas-fir region of western Oregon and Washington. Nat. Areas J. 8:190-201.

TYRELL, L.E. and T.R. CROW. 1994. Structural characteristics of old-growth hemlock-hardwood forests in relation to age. Ecology 75:370-386.

WHITNEY, G.G. 1984. Fifty years of change in the arboreal vegetation of Heart's Content, an old-growth hemlock-white pine-northern hardwood stand. Ecology 65:403-408.

WHITNEY, G.G. 1990. The history and status of the hemlock-hardwood forests of the Allegheny Plateau. J. Ecol. 78:443-458.

WOODS, K.D. 1984. Patterns of tree replacement: canopy effects on understory pattern in hemlock-northern hardwood forest. Vegetatio 56:87-107.

WOODS, K.D. 2000a. Long-term change and spatial pattern in a late-successional hemlock-northern hardwood forest. J. Ecol. 88:267-282.

WOODS, K.D. 2000b. Dynamics in late-successional hemlock-hardwood forests over three decades. Ecology 81:110-126.

Received December 18, 2001; Accepted July 17, 2002.

PETER P. ZAWADZKAS and WARREN G. ABRAHAMSON*

Department of Biology, Bucknell University, Lewisburg, Pennsylvania 17837

* Corresponding author's email address: abrahmsn@bucknell.edu