Scientists & Staff

Featured Publications & Products

• Ristau, Todd E.; Stoleson, Scott H.; Horsley, Stephen B.; deCalesta, David S. 2011. Ten-year response of the herbaceous layer to an operational herbicide-shelterwood treatment in a northern hardwood forest. Forest Ecology and Management. 262: 970-979.
• Long, Robert P.; Horsley, Stephen B.; Hall, Thomas J. 2011. Long-term impact of liming on growth and vigor of northern hardwoods. Canadian Journal of Forest Research. 41(6): 1295-1307.
• Long, Robert P.; Horsley, Stephen B.; Hallett, Richard A.; Bailey, Scott W. 2009. Sugar maple growth in relation to nutrition and stress in the northeastern United States. Ecological Applications. 19(6): 1454-1466.
• Brose, Patrick H.; Gottschalk, Kurt W.; Horsley, Stephen B.; Knopp, Peter D.; Kochenderfer, James N.; McGuinness, Barbara J.; Miller, Gary W.; Ristau, Todd E.; Stoleson, Scott H.; Stout, Susan L. 2008. Prescribing regeneration treatments for mixed-oak forests in the Mid-Atlantic region. Gen. Tech. Rep. NRS-33. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 100 p.
• Horsley, Stephen B.; Bailey, Scott W.; Ristau, Todd E.; Long, Robert P.; Hallett, Richard A. 2008. Linking environmental gradients, species composition, and vegetation indicators of sugar maple health in the northeastern United States. Canadian Journal of Forest Research. 38: 1761-1774.

Publications & Products

• Long, Robert P.; Bailey, Scott W.; Horsley, Stephen B.; Hall, Thomas J. 2022. Thirty-year effects of liming on soil and foliage chemistry and growth of northern hardwoods in Pennsylvania, USA. Canadian Journal of Forest Research
• Bailey, Scott W.; Long, Robert P.; Horsley, Stephen B. 2021. Forest Soil Cation Dynamics and Increases in Carbon on the Allegheny Plateau, PA, USA Following a Period of Strongly Declining Acid Deposition. Soil Systems
• Bailey, Scott W.; Long, Robert P.; Horsley, Stephen B. 2019. Comment on "Long-term decline of sugar maple following forest harvest, Hubbard Brook Experimental Forest, New Hampshire". Canadian Journal of Forest Research
• Horsley, Stephen B. 2019. Using herbicides to control interfering understories in Allegheny hardwood stands, 1. Early development of prescriptions. In: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 37-43.
• Long, Robert P.; Horsley, Stephen B.; Bailey, Scott W.; Hallett, Richard A.; Hall, Thomas J. 2019. Sugar maple decline and lessons learned about Allegheny Plateau soils and landscapes. In: Stout, Susan L., ed. SILVAH: 50 years of science-management cooperation. Proceedings of the Allegheny Society of American Foresters training session; 2017 Sept. 20-22; Clarion, PA. Gen. Tech. Rep. NRS-P-186. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 80-97.
• Long, Robert P.; Bailey, Scott W.; Horsley, Stephen B.; Hall, Thomas J.; Swistock, Bryan R.; DeWalle, David R. 2015. Long-term effects of forest liming on soil, soil leachate, and foliage chemistry in northern Pennsylvania. Soil Science Society of America Journal. 79(4): 1223-1236.
• Long, Robert P.; Brose, Patrick H.; Horsley, Stephen B. 2012. Responses of northern red oak seedlings to lime and deer exclosure fencing in Pennsylvania. Canadian Journal of Forest Research: 42:698-709.
• Stoleson, Scott H.; Ristau, Todd E.; deCalesta, David S.; Horsley, Stephen B. 2011. Ten-year response of a forest bird community to an operational herbicide-shelterwood treatment in Allegheny hardwoods. Forest Ecology and Management. 262: 1205-1214.
• McWilliams, William H.; Cassell, Seth P.; Alerich, Carol L.; Butler, Brett J.; Hoppus, Michael L.; Horsley, Stephen B.; Lister, Andrew J.; Lister, Tonya W.; Morin, Randall S.; Perry, Charles H.; Westfall, James A.; Wharton, Eric H.; Woodall, Christopher W. 2007. Pennsylvania's Forest 2004. Resour. Bull. NRS-20. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 86 p.
• Hallett, Richard A.; Bailey, Scott W.; Horsley, Stephen B.; Long, Robert P. 2006. Influence of nutrition and stress on sugar maple at a regional scale. Canadian Journal of Forest Research 36(9):2235-2246
• Morin, Randall S.; Liebhold, Andrew M; Gottschalk, K.W.; Woodall, Chris W.; Twardus, Daniel B.; White, Robert L.; Horsley, Stephen B.; Ristau, Todd E. 2006. Analysis of forest health monitoring surveys on the Allegheny National Forest (1998-2001). Gen. Tech. Rep. NE-339. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 102 p.
• Ristau, Todd E.; Horsley, Stephen B. 2006. When is pin cherry (Prunus pensylvanica L.) a problem in Allegheny hardwoods?. Northern Journal of Applied Forestry 23(3):204-210
• Bailey, S.W.; Horsley, S.B.; Long, R.P. 2005. Thirty years of change in forest soils of the Allegheny Plateau, Pennsylvania. Soil Science Society of America Journal. 69: 681-690.
• McWilliams, William H.; Bowersox, Todd W.; Brose, Patrick H.; Devlin, Daniel A.; Finley, James C.; Gottschalk, Kurt W.; Horsley, Steve; King, Susan L.; LaPoint, Brian M.; Lister, Tonya W.; McCormick, Larry H.; Miller, Gary W.; Scott, Charles T.; Steele, Harry; Steiner, Kim C.; Stout, Susan L.; Westfall, James A.; White , Robert L. 2005. Measuring Tree Seedlings and Associated Understory Vegetation in Pennsylvania's Forests. In: McRoberts, Ronald E.; Reams, Gregory A.; Van Deusen, Paul C.; McWilliams, William H.; Cieszewski, Chris J., eds. Proceedings of the fourth annual forest inventory and analysis symposium; Gen. Tech. Rep. NC-252. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station. 21-26
• Bailey, S.W.; Horsley, S.B.; Long, R.B.; Hallett, R.A. 2004. Division S-7 - forest & range soils. Influence of edaphic factors on sugar maple nutrition and health on the Allegheny Plateau. Soil Science of America Journal. 68: 243-252
• McWilliams, William H.; Bowersox, Todd W.; Brose, Patrick H.; Devlin, Daniel A.; Finley, James C.; Horsley, Steve; Gottschalk, Kurt W.; Lister, Tonya W.; McCormick, Larry H.; Miller, Gary W.; Steiner, Kim C.; Stout, Susan L.; Westfall, James A.; White, Robert L. 2004. Indicators of regenerative capacity for eastern hardwood forests. In: Proceedings, Society of American Foresters 2003 national convention; 2003 October 25-29; Buffalo, NY. Bethesda, MD: Society of American Foresters: 136-140.
• McWilliams, William H.; Bowersox, Todd W.; Brose, Patrick H.; Devlin, Daniel A.; Finley, James C.; Horsley, Steve; Gottschalk, Kurt W.; King, Susan L.; Lister, Tonya W.; McCormick, Larry H.; Miller, Gary W.; Scott, Charles T.; Steiner, Kim C.; Stout, Susan L.; Westfall, James A.; White, Robert L. 2003. Indicators of regenerative capacity for native broadleaf forests: a case study of ungulate overpopulation in the Eastern United States. In: Congress proceedings, Xii world forestry congress; 2003 September 21-28; Quebec City, Canada. [Place of publication unknown]: [Publisher unknown]: 342.
• Wargo, Philip M.; Minocha, Rakesh; Wong, Betty L.; Long, Robert P.; Horsley, Stephen B.; Hall, Thomas J. 2003. Measuring stress and recovery in limed sugar maple on the Allegheny Plateau of north-central Pennsylvania. In: Fosbroke, Sandra L.C.; Gottschalk, Kurt W., eds. Proceedings, U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2002; 2002 January 15-18; Annapolis, MD. Gen. Tech. Rep. NE-300. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 101.
• Horsley, Stephen B.; Long, Robert P.; Bailey, Scott W.; Hallett, Richard A.; Wargo, Philip M. 2002. Health of eastern North American sugar maple forests and factors affecting decline. Northern Journal of Applied Forestry. 19(2): 34-44.
• Wargo, Philip M.; Minocha, Rakesh; Wong, Betty; Long, Robert P.; Horsley, Stephen B.; Hall, Thomas J. 2002. Measuring changes in stress and vitality indicators in limed sugar maple on the Allegheny Plateau in north-central Pennsylvania. Canadian Journal of Forest Research. 32: 629-641.
• Morin, R.S.; Liebhold, A.M.; Gottschalk, K.W.; Twardus, D.B.; Acciavatti, R.E.; White, R.L.; Horsley, S.B.; Smith, W.D.; Luzader, E.R. 2001. Forest health conditions on the Allegheny National Forest (1989-1999): Analysis of forest health monitoring surveys. NA-TP-04-01. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Area, State and Private Forestry. 68 p.
• Ristau, Todd E.; Horsley, Stephen B.; McCormick, Larry H. 2001. Sampling to assess species diversity of herbaceous layer vegetation in Allegheny hardwood forests. Journal of the Torrey Botanical Society. 128(2): 150-164.
• Horsley, Stephen B.; Long, Robert P.; Bailey, Scott W.; Hallett, Richard A.; Hall, Thomas J. 2000. Factors associated with the decline disease of sugar maple on the Allegheny Plateau. Canadian Journal of Forest Research. 30: 1365-1378.
• Bailey, Scott W.; Horsley, Stephen B.; Long, Robert P.; Hallett, Richard A. 1999. Influence of geologic and pedologic factors on health of sugar maple on the Allegheny Plateau. In: Horsley, Stephen B.; Long, Robert P., eds. Sugar maple ecology and health: proceedings of an international symposium; 1998 June 2-4; Warren, PA. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 63-65.
• Hallett, Richard A.; Horsley, Stephen B.; Long, Robert P.; Bailey, Scott W.; Hall, Thomas J. 1999. Foliar chemistry of sugar maple: a regional view. In: Horsley, Stephen B.; Long, Robert P., eds. Sugar maple ecology and health: proceedings of an international symposium; 1998 June 2-4; Warren, PA. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 66.
• Horsley, Stephen B.; Long, Robert P.; Bailey, Scott W.; Hallett, Richard A.; Hall, Thomas J. 1999. Factors contributing to sugar maple decline along topographic gradients on the glaciated and unglaciated Allegheny Plateau. In: Horsley, Stephen B.; Long, Robert P., eds. Sugar maple ecology and health: proceedings of an international symposium; 1998 June 2-4; Warren, PA. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 60-62.
• Horsley, Stephen B.; Long, Robert P.; eds. 1999. Sugar maple ecology and health: proceedings of an international symposium. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 120 p.
• Long, Robert P.; Horsley, Stephen B.; Lilja, Paul R. 1999. Impact of forest liming on growth, vigor, and reproduction of sugar maple and associated hardwoods. In: Horsley, Stephen B.; Long, Robert P., eds. Sugar maple ecology and health: proceedings of an international symposium; 1998 June 2-4; Warren, PA. Gen. Tech. Rep. NE-261. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 55-58.
• Ristau, Todd E.; Horsley, Stephen B. 1999. Pin cherry effects on Allegheny hardwood stand development. Canadian Journal of Forest Research. 29: 73-84.
• Long, Robert P.; Horsley, Stephen B.; Lilja, Paul R. 1997. Impact of forest liming on growth and crown vigor of sugar maple and associated hardwoods. Canadian Journal of Forest Research. 27: 1560-1573.
• Stout, Susan L.; deCalesta, David S.; Horsley, Stephen B.; Nowak, Christopher A.; Redding, James C. 1995. Ecosystems management research in hardwood forests dominated by deer. In: Gottschalk, Kurt W.; Fosbroke, Sandra L. C., ed. Proceedings, 10th Central Hardwood Forest Conference; 1995 March 5-8; Morgantown, WV.: Gen. Tech. Rep. NE-197. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 577.
• Horsley, Stephen B.; Gottschalk, Kurt W. 1993. Leaf area and net photosynthesis during development of Prunus serotina seedlings. Tree Physiology. 12: 55-69.
• Horsley, S.B. 1991. Using Roundup and Oust to control interfering understories in Allegheny hardwood stands. In: McCormick, Larry H.; Gottschalk, Kurt W., eds. Proceedings, 8th Central Hardwood Forest Conference; 1991 March 4-6; University Park, PA. Gen. Tech. Rep. NE-148. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 281-290.
• Horsley, Stephen B.; Marquis, David A. 1983. Interference by weeds and deer with Allegheny hardwood reproduction. Canadian Journal of Forest Research. 13: 61-69.
• Horsley, Stephen B. 1982. Development of reproduction in Allegheny hardwood stands after herbicide-clearcuts and herbicide-shelterwood cuts. Research Note NE-308. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 4 p.