Scientists & Staff
Robert P. Long
Featured Publications & Products
- 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.
- Knight, Kathleen S.; Herms, Daniel A.; Cardina, John; Long, Robert; Gandhi, Kamal J.K.; Herms, Catharine P. 2011. Emerald ash borer aftermath forests: the future of ash ecosystems. In: McManus, Katherine A; Gottschalk, Kurt W., eds. 2010. Proceedings. 21st U.S. Department of Agriculture interagency research forum on invasive species 2010; 2010 January 12-15; Annapolis, MD. Gen. Tech. Rep. NRS-P-75. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 97.
- Balci, Y.; Long, R.P.; Mansfield, M.; Balser, D.; MacDonald, W.L. 2010. Involvement of Phythophthora species in white oak (Quercus alba) decline in southern Ohio. Forest Pathology. 40: 430-442.
- Knight, Kathleen S.; Herms, Daniel A.; Cardina, John; Long, Robert; Rebbeck, Joanne; Gandhi, Kamal J.K.; Smith, Annemarie; Klooster, Wendy S.; Herms, Catherine P.; Royo, Alejandro A. 2010. Emerald ash borer aftermath forests: The dynamics of ash mortality and the responses of other plant species. In: Michler, Charles H.; Ginzel, Matthew D., eds. 2010. Proceedings of symposium on ash in North America; 2010 March 9-11; West Lafayette, IN. Gen. Tech. Rep. NRS-P-72. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 11.
- Knight, Kathleen S.; Long, Robert P.; Rebbeck, Joanne; Herms, Daniel A.; Cardina, John; Herms, Catherine P.; Gandhi, Kamal J.K.; Smith, Annemarie; Costilow, Kyle C.; Long, Lawrence C.; Cappaert, David L. 2010. Effects of emerald ash borer (Agrilus planipennis) on forest ecosystems. In: McManus, Katherine A; Gottschalk, Kurt W., eds. Proceedings. 20th U.S. Department of Agriculture interagency research forum on invasive species 2009; 2009 January 13-16; Annapolis, MD. Gen. Tech. Rep. NRS-P-51. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 82.
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
- Royo, Alejandro ; Vickers, Lance ; Long, Robert ; Ristau, Todd ; Stoleson, Scott ; Stout, Susan L. 2021. The Forest of Unintended Consequences: Anthropogenic Actions Trigger the Rise and Fall of Black Cherry. BioScience
- Long, Robert P.; Ristau, Todd E. 2020. Changes in Black Cherry Seed Production: Is Stand Age a Factor?. Northeastern Naturalist
- 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
- 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.
- Pile, Lauren ; Rebbeck, Joanne ; Brose, Patrick ; Long, Robert P. 2019. Black and Chestnut Oak Seedling Response to Glaciated Soil: Implications for Northward Expansion in Response to Climate Warming. Forest Science
- Stout, Susan L.; Brose, Patrick H.; Cleveland, Helene ; Long, Robert P.; McGuinness, Barbara ; Peters, Matthew P.; Rebbeck, Joanne ; Ristau, Todd ; Royo, Alejandro A.; Stoleson, Scott H.; Thomasma, Scott ; Twery, Mark J.; Wurzbacher, Sarah. 2019. Fifty years of science-management cooperation from the SILVAH community of practice. 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: 8-25.
- Long, Robert ; Wiemann, Michael ; Kuster, Thomas A. 2018. The Frequency and Anatomical Characteristics of Anomalous Dark Rings in Black Cherry, and Their Relation to Cherry Scallop Shell Moth Defoliations. Forest Science
- Turcotte, Richard M.; Larcenaire, Craig ; Long, Robert ; Martin, Danielle K.H.; Barringer, Lawrence. 2018. The Spotted Wing Drosophila, Drosophila suzukii (Diptera: Drosophilidae): A New Pest of Concern for Black Cherry, Prunus serotina, on the High Allegheny Plateau in Pennsylvania. Entomological News
- Iverson, Louis; Knight, Kathleen S.; Prasad, Anantha; Herms, Daniel A.; Matthews, Stephen; Peters, Matthew; Smith, Annemarie; Hartzler, Diane M.; Long, Robert; Almendinger, John. 2015. Potential species replacements for black ash (Fraxinus nigra) at the confluence of two threats: Emerald ash borer and a changing climate. Ecosystems. 19: 248-270. doi: 10.1007/s10021-015-9929-y.
- 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.
- Moore, Jean-David; Ouimet, Rock; Long, Robert P.; Bukaveckas, Paul. A. 2015. Ecological benefits and risks arising from liming sugar maple dominated forests in northeastern North America. Environmental Reviews. 23(1): 66-77.
- Smith, Annemarie; Herms, Daniel A.; Long, Robert P.; Gandhi, Kamal J.K. 2015. Community composition and structure had no effect on forest susceptibility to invasion by the emerald ash borer (Coleoptera: Buprestidae). Canadian Entomologist. 147(3): 318-328.
- Hutchinson, Todd F.; Long, Robert P.; Rebbeck, Joanne ; Kennedy Sutherland, Elaine ; Yaussy, Daniel A. 2014. Repeated fires, canopy gaps, and tree regeneration in Appalachian mixed oak forests. Gen. Tech. Rep. SRS-199. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 208p
- Hutnik, Russell J.; McClenahen, James R.; Long, Robert P.; Davis, Donald D. 2014. Mercury Accumulation in Pinus nigra (Austrian Pine). Northeastern Naturalist
- Knight, Kathleen S.; Brown, John P.; Long, Robert P. 2013. Factors affecting the survival of ash (Fraxinus spp.) trees infested by emerald ash borer (Agrilus planipennis). Biological Invasions. 15: 371-383.
- Hutchinson, Todd F.; Long, Robert P.; Rebbeck, Joanne; Sutherland, Elaine Kennedy; Yaussy, Daniel A. 2012. Repeated prescribed fires alter gap-phase regeneration in mixed-oak forests. Canadian Journal of Forest Research. 42: 303-314.
- Hutchinson, Todd F.; Yaussy, Daniel A.; Long, Robert P.; Rebbeck, Joanne; Sutherland, Elaine Kennedy. 2012. Long-term (13-year) effects of repeated prescribed fires on stand structure and tree regeneration in mixed-oak forests. Forest Ecology and Management. 286: 87-100.
- 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.
- Long, Robert P.; Trimpey, David W.; Wiemann, Michael C.; Stout, Susan L. 2012. Anomalous dark growth rings in black cherry. Northern Journal of Applied Forestry. 29(3): 150-154.
- Iverson, Louis; Prasad, Anantha; Knight, Kathleen S.; Herms, Daniel A.; Matthews, Stephen; Peters, Matthew; Smith, Annemarie; Long, Robert. 2011. Potential replacements for northwoods black ash in a changing climate: the confluence of two challenges. In: Parra, Gregory; Lance, David; Mastro, Victor; Reardon, Richard; Benedict, Chuck, comps. 2011 emerald ash borer national research and technology development meeting; 2011 October 12-13; Wooster, OH. FHTET-2011-06. Morgantown, WV; U.S. Department of Agriculture, Forest Service, State and Private Forestry, Forest Health Protection, Forest Health Technology Enterprise Team: 63-64.
- Nagle, Annemarie M.; Long, Robert P.; Madden, Laurence V.; Bonello, Pierluigi. 2010. Association of Phytophthora cinnamomi with white oak decline in southern Ohio. Plant Disease. 94(8): 1026-1034.
- Herms, Daniel A.; Gandhi, Kamal J.K.; Smith, Annemarie; Cardina, John; Knight, Kathleen S.; Herms, Catherine P.; Long, Robert P.; McCullough, Deborah G. 2009. Ecological impacts of emerald ash borer in forests of southeast Michigan. In: McManus, Katherine A; Gottschalk, Kurt W., eds. Proceedings. 20th U.S. Department of Agriculture interagency research forum on invasive species 2009; 2009 January 13-16; Annapolis, MD. Gen. Tech. Rep. NRS-P-51. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 36-37.
- Hutchinson, Todd; Long, Robert; Ford, Robert; Sutherland, Elaine Kennedy. 2009. Fire history and the establishment of oaks and maples in second-growth forests. In: Hutchinson, Todd F., ed. Proceedings of the 3rd fire in eastern oak forests conference; 2008 May 20-22; Carbondale, IL. Gen. Tech. Rep. NRS-P-46. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 149.
- 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.
- Gandhi, Kamal J.K.; Smith, Annemarie; Long, Robert P.; Taylor, Robin A.J.; Herms, Daniel A. 2008. Three-year progression of emerald ash borer-induced decline and mortality in southeastern Michigan. In: Mastro, Victor; Lance, David; Reardon, Richard; Parra, Gregory, comps. Emerald ash borer research and development meeting; 2007 October 23-24; Pittsburgh, PA. FHTET 2008-07. Morgantown, WV: U.S. Department of Agriculture, Forest Service, Forest Health Technology Enterprise Team: 27.
- 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.
- Hutchinson, Todd F.; Long, Robert P.; Ford, Robert D.; Sutherland, Elaine Kennedy. 2008. Fire history and the establishment of oaks an maples in second-growth forests. Canadian Journal of Forest Research. 38: 1184-1198.
- Knight, Kathleen S.; Long, Robert P.; Rebbeck, Joanne; Smith, Annemarie; Gandhi, Kamal; Herms, Daniel A. 2008. How fast will trees die? A transition matrix model of ash decline in forest stands infested by emerald ash borer. In: Mastro, Victor; Lance, David; Reardon, Richard; Parra, Gregory, comps. Emerald ash borer research and development meeting; 2007 October 23-24; Pittsburgh, PA. FHTET 2008-07. Morgantown, WV: U.S. Department of Agriculture, Forest Service, Forest Health Technology Enterprise Team: 28-29.
- Balci, Y.; Balci, S.; Eggers, J.; MacDonald, W.L.; Juzwik, J.; Long, R.P.; Gottschalk, K.W. 2007. Phytophthora spp. associated with forest soils in eastern and north-central U.S. oak ecosystems. Plant Disease. 91: 705-710.
- Gandhi, Kamal J.K.; Smith, Annemarie; Long, Robert P.; Herms, Daniel A. 2007. Patterns of emerald ash borer-induced ash decline and mortality in the forests of southeastern Michigan. In: Mastro, Victor; Lance, David; Reardon, Richard; Parra, Gregory, comps. Emerald ash borer and Asian longhorhed beetle research and development review meeting; 2006 October 29-November 2; Cincinnatti, OH. FHTET 2007-04. Morgantown, WV: U.S. Forest Service, Forest Health Technology Enterprise Team: 26-27.
- Knight, Kathleen S.; Long, Robert P.; Rebbeck, Joanne. 2007. Predicting emerald ash borer-induced changes in forest tree species composition. In: Mastro, Victor; Lance, David; Reardon, Richard; Parra, Gregory, comps. Emerald ash borer and Asian longhorhed beetle research and development review meeting; 2006 October 29-November 2; Cincinnatti, OH. FHTET 2007-04. Morgantown, WV: U.S. Forest Service, Forest Health Technology Enterprise Team: 25-26.
- McEwan, Ryan W.; Hutchinson, Todd F.; Long, Robert P.; Ford, Robert D.; McCarthy, Brian C. 2007. Temporal and spatial patterns in fire occurrence during the establishment of mixed-oak forests in eastern North America . Journal of Vegetation Science. 18: 655-664.
- Smith, Annemarie; Herms, Daniel A.; Long, Robert P. 2007. Impact of emerald ash borer on forests within the Huron River watershed of southeast Michigan. In: Gottschalk, Kurt W., ed. Proceedings, 17th U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2006; Gen. Tech. Rep. NRS-P-10. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 92.
- 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
- Long, Robert P.; Apsley, David K; Rebbeck, Joanne. 2006. Oak and maple stump sprout dynamics in response to thinning and burning treatments in southern Ohio. In: Dickinson, Matthew B., ed. 2006. Fire in eastern oak forests: delivering science to land managers, proceedings of a conference; 2005 November 15-17; Columbus, OH. Gen. Tech. Rep. NRS-P-1. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 283.
- Rebbeck , Joanne; Yaussy, Daniel; Iverson, Louis; Hutchinson, Todd; Long, Robert; Bova, Anthony; Dickinson, Matthew. 2006. Use of temperature-sensitive paints as an index of heat output from fire. In: Dickinson, Matthew B., ed. 2006. Fire in eastern oak forests: delivering science to land managers, proceedings of a conference; 2005 November 15-17; Columbus, OH. Gen. Tech. Rep. NRS-P-1. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 295.
- 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.
- Rebbeck, Joanne; Hutchinson, Todd F.; Long, Robert P.; Long, Robert P. 2005. Invasive Plants Affecting the Management of Ohio's Forests. In: Gottschalk, Kurt W., ed. Proceedings, 16th U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2005; 2005 January 18-21; Annapolis, MD. Gen. Tech. Rep. NE-337. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 68-70.
- Smith, Annemarie; Herms, Daniel A.; Long, Robert P. 2005. Does forest community structure influence susceptibility and response to emerald ash borer?. In: Mastro, Victor; Reardon, Richard, comps. Proceedings of the emerals ash borer research and development meeting; 2004 October 5-6; Romulus, MI. FHTET 2004-15. Morgantown, WV: U.S. Forest Service, Forest Health Technology Enterprise Team: 26.
- Smith, Annemarie; Herms, Daniel A.; Long, Robert P. 2005. Does Community Structure Influence Forest Susceptibility and Response to Emerald Ash Borer. In: Gottschalk, Kurt W., ed. Proceedings, 16th U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species 2005; 2005 January 18-21; Annapolis, MD. Gen. Tech. Rep. NE-337. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 76.
- 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
- Hutchinson, Todd; Rebbeck, Joanne; Long, Robert. 2004. Abundant Establishment of Ailanthus altissima (Tree-of-heaven) after Restoration Treatments in an Upland Oak Forest. In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 514
- Iverson, Louis R.; Yaussy, Daniel A.; Rebbeck, Joanne; Hutchinson, Todd F.; Long, Robert P.; Prasad, Anantha M. 2004. A comparison of thermocouples and temperature paints to monitor spatial and temporal characteristics of landscape-scale prescribed fires. International Journal of Wildland Fire. 13: 311-322.
- Long, Robert P.; Rebbeck, Joanne; Traylor, Zachary P. 2004. Oak Stump Sprout Health and Survival Following Thinning and Prescribed Burning in Southern Ohio. In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 209.
- Rebbeck, Joanne; Long, Robert P.; Yaussy, Daniel A. 2004. Survival of Hardwood Seedlings and Saplings One Year Following a Prescribed Fire and Overstory Thinning in Southeastern Ohio. In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 210.
- Rebbeck, Joanne; Long, Robert; Yaussy, Daniel. 2004. Survival of Hardwood Seedlings and Saplings Following Overstory Thinning and Prescribed Fires in Mixed-Oak Forests of Southern Ohio. Gen. Tech. Rep. SRS-73. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 275-284
- Riccardi, Cynthia L.; McCarthy, Brian C.; Long, Robert P. 2004. Oak Seed Production, Weevil (Coleoptera: Curculionidae) Populations, and Predation Rates in Mixed-oak Forests of Southeast Ohio. In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16 19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 10-20.
- Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. 2004. Proceedings. 14th Central Hardwood Forest Conference. 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture. Forest Service. Northeastern Research Station. 539 p. [CD-Rom]
- Davis, D. D.; Long, R. P. 2003. Climate-tree growth models in relation to long-term growth trends of white oak in Pennsylvania. In: Van Sambeek, J. W.; Dawson, Jeffery O.; Ponder Jr., Felix; Loewenstein, Edward F.; Fralish, James S., eds. Proceedings of the 13th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-234. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station: 527-537
- Iverson, Louis R.; Yaussy, Daniel; Rebbeck, Joanne; Hutchinson, Todd; Long, Robert; McCarthy, Brian; Riccardi, Cynthia; Prasad, Anantha. 2003. Spatial and temporal distribution of fire temperatures from prescribed fires in the mixed oak forests of southern Ohio. In: Van Sambeek, J. W.; Dawson, Jeffery O.; Ponder Jr., Felix; Loewenstein, Edward F.; Fralish, James S., eds. Proceedings of the 13th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-234. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station: 293-294
- Scherzer, Amy J.; Long, Robert P.; Rebbeck, Joanne. 2003. Foliar nutrient concentrations of oak, hickory, and red maple. In: Sutherland, Elaine K.; Hutchinson, Todd F., eds. Characteristics of mixed oak forest ecosystems in southern Ohio prior to the reintroduction of fire. Gen. Tech. Rep. NE-299. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 113-121
- 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.
- Yaussy, Daniel; Rebbeck, Joanne; Iverson, Louis; Hutchinson, Todd; Long, Robert. 2003. Comparison of a low-tech vs. a high-tech method to evaluate surface fire temperatures. In: Van Sambeek, J. W.; Dawson, Jeffery O.; Ponder Jr., Felix; Loewenstein, Edward F.; Fralish, James S., eds. Proceedings of the 13th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-234. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station: 295
- 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.
- 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.
- Williams, David W.; Long, Robert P.; Wargo, Philip M.; Liebhold, Andrew M. 2000. Effects of climate change on forest insect and disease outbreaks. In: Mickler, Robert A.; Birdsey, Richard A.; Hom, John, eds. Responses of northern U.S. forests to environmental change. Ecological studies 139. New York: Springer-Verlag: 455-494.
- 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.
- McQuattie, Carolyn J.; Long, Robert P.; Hall, Thomas J. 1999. Sugar maple seedling anatomy and element localization at forest sites with differing nutrient levels. 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: 59.
- 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.
- McClenahen, J. R.; Long, R. P. 1995. Variability in oak forest herb layer communities. 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. 60-78
National Research Highlights
Black cherry regeneration difficulties: Are They Related to Stand Age or Something Else?
Year: 2017
Forest managers report that black cherry regeneration is impeded by poor and erratic seed production. Tree stand age has been suggested as one of the causal factors affecting seed production. Forest Service scientists monitored black cherry seed production over seven years to see whether stand age affects seed production.
Using fertilizer to promote diverse seedling development in Allegheny hardwood forests
Year: 2017
Fertilizing the forest understory slows the development of dominance by sweet birch, favors development of black cherry following overstory removal, and favors red maple in partial cut shelterwood stands.
Black Cherry Crown Health and Mortality on the Allegheny National Forest
Year: 2016
Black cherry, an important timber and wildlife species in the Allegheny hardwood forest, is suffering from poor crown health and increased mortality across northern Pennsylvania. Research is in progress to determine the biotic and abiotic factors causing this change in black cherry health status and to provide guidance to managers for determining appropriate treatment options.
Changes in Black Cherry on the Allegheny Plateau
Year: 2016
Increased tree mortality, decreased seed production, and seedling growth. Managers and scientists have been observing these changes in black cherry on the Allegheny Plateau and are working together to sharpen the research focus and utilize long-term research to improve forest management.
Long-Term Effects of Forest Liming on Soil, Soil Leachate, and Foliage Chemistry in Northern Pennsylvania
Year: 2015
In many areas of the northeastern United States and Canada, base cations have been depleted by long-term inputs of acidic deposition. Forest liming restores base cations, which improves the crown health, growth, and seed production of sugar maple. Forest Service scientists now know that forest liming changes soil chemistry and effects persist for 21 years.
Liming Effects Help Maintain Sugar Maple Growth and Health and Persist for More Than 20 years
Year: 2014
Long-term inputs of acidic deposition have depleted soils of calcium (Ca) and magnesium (Mg) on ridge-top, unglaciated sites in Pennsylvania. Sugar maple requires adequate supplies of these elements to maintain growth, crown health, and flower and seed production. Soils sampled as part of a long-term liming study in northern Pennsylvania show that Ca and Mg levels have remained elevated through the soil profile to a depth of 1.5 feet for 21 years after an initial treatment with 10 tons per acre of dolomitic limestone.