Current Research

Large-scale, longterm timber/wildlife management studies in northern hardwoods/hemlock. Forest landtyping/succession.

Education

• NY State College of Forestry, M.F. Forest Management 1956
• NY State College of Forestry, B.S. Forestry 1953

Professional Organizations

• Fellow, Society of American Foresters
• NH Timberland Owners Association

Featured Publications & Products

• Leak, William B.; Yamasaki, Mariko. 2010. Seventy-year record of changes in the composition of overstory species by elevation on the Bartlett Experimental Forest.
• Leak, William B.; Gove, Jeffrey H. 2008. Growth of northern hardwoods in New England: a 25-year update.
• Sendak, Paul E.; Leak, William B. 2008. Early crop-tree release and species cleaning in young northern hardwoods: a financial analysis.
• Fast, Andrew J.; Ducey, Mark J.; Gove, Jeffrey H.; Leak, William B. 2008. Dating tree mortality using log decay in the White Mountains of New Hampshire.
• DeGraaf, Richard M.; Lester, Anna M.; Yamasaki, Mariko; Leak, William B. 2007. Visual simulations of forest wildlife habitat structure, change, and landscape context in New England.

Publications

• Leak, William B. 2015. Dominant-tree thinning in New England northern hardwoods a second look.
• Yamasaki, Mariko; Costello, Christine A.; Leak, William B. 2014. Effects of clearcutting, patch cutting, and low-density shelterwoods on breeding birds and tree regeneration in New Hampshire northern hardwoods.
• Leak, William B.; Yamasaki, Mariko; Holleran, Robbo. 2014. Silvicultural guide for northern hardwoods in the northeast.
• Leak, William B.; Yamasaki, Mariko. 2013. Effects of low-density thinning in a declining white pine stand in Maine.
• Leak, Bill. 2013. Long-term research -- why do we do it.
• Leak, William B.; Yamasaki, Mariko. 2013. Regeneration of upper-elevation red oak in the White Mountains of New Hampshire.
• Leak, William B.; Yamasaki, Mariko. 2012. 80 Years of thinning research on northern hardwoods in the Bartlett Experimental Forest, New Hampshire.
• Hoover, Coeli M.; Leak, William B.; Keel, Brian G. 2012. Benchmark carbon stocks from old-growth forests in northern New England, USA.
• Leak, William B.; Yamasaki, Mariko. 2012. Historical (1899) age and structural characteristics of an old-growth northern hardwood stand in New York State.
• Leak, William B.; Yamasaki, Mariko. 2012. Tree species migration studies in the White Mountains of New Hampshire.
• Leak, William B. 2011. Estimating allowable-cut by area-scheduling.
• Leak, William B. 2011. Historical (1749-1899) vs. present-day sugar maple and beech diameter growth in the northeast.
• Leak, William B.; Yamasaki, Mariko. 2011. The Bartlett Experimental Forest, Its first 75 years.
• Leak, William B. 2009. Seventy years of understory development by elevation class in a New Hampshire mixed forest: management implications.
• Leak, William B. 2007. Accuracy of regeneration surveys in New England northern hardwoods.
• Leak, William. 2007. Thinning northern hardwoods in New England by dominant-tree removal early results.
• Leak, William B. 2006. Fifty-year impacts of the beech bark disease in the Bartlett Experimental Forest, New Hampshire.
• Sendak, Paul E.; Frank, Robert M.; Leak, William B. 2006. Long-term data from silvicultural studies: interpreting and assessing old records for economic insights.
• Yamasaki, Mariko; Leak, William B. 2006. Snag longevity in managed northern hardwoods.
• Leak, William B.; Leak, William B. 2005. Effects of Small Patch Cutting on Sugar Maple Regeneration in New Hampshire Northern Hardwoods.
• Innes, J. C.; Ducey, M. J.; Gove, J. H.; Leak, W. B.; Barrett, J. P. 2005. Size-density metrics, leaf area, and productivity in eastern white pine.
• Desmarais, Kenneth M.; Leak, William B.; Leak, William B. 2005. Ten-Year Performance of Eastern White Pine - under a Crop Tree Release Regime on an Outwash Site.
• Leak, William B. 2004. Diameter Growth in Even- and Uneven-Aged Northern Hardwoods in New Hampshire Under Partial Cutting.
• Leak, William B. 2003. Best density and structure for uneven-aged northern hardwood management in New England.
• Leak, William B. 2003. Regeneration of Patch Harvests in Even-Aged Northern Hardwoods in New England.
• Leak, William B.; Sendak, Paul E. 2002. Changes in species, grade, and structure over 48 years in a managed New England northern hardwood stand.
• Solomon, Dale S.; Leak, William B. 2002. Modeling the regeneration of northern hardwoods with FOREGEN.
• Leak, William B. 2002. Origin of sigmoid diameter distributions.
• Zhang, Lianjun; Gove, Jeffrey H.; Liu, Chuangmin; Leak, William B. 2001. A finite mixture of two Weibull distributions for modeling the diameter distributions of rotated-sigmoid, uneven-aged stands.
• Solomon, Dale S.; Leak, William B. 2000. Growth and stocking of eastern hemlock (Tsuga canadensis) in New England.
• Costello, Christine A.; Yamasaki, Mariko; Pekins, Peter J.; Leak, William B.; Neefus, Christopher D. 2000. Songbird response to group selection harvests and clearcuts in a New Hampshire northern hardwood forest.
• Leak, William B.; Lamson, Neil I. 1999. Revised white pine stocking guide for managed stands.
• Leak, William B.; Yamasaki, Mariko; Kittredge, David B., Jr.; Lamson, Neil I.; Smith, Marie-Louise. 1997. Applied ecosystem management on nonindustrial forest land..
• Nowak, Chris; Stout, Susan; Brissette, John; Kenefic, Laura; Miller, Gary; Leak, Bill; Yaussy, Dan; Schuler, Tom; Gottschalk, Kurt. 1997. Defining the role of silvicultural research in the Northeastern Forest Experiment Station.
• Solomon, Dale S.; Leak, William B. 1996. Evaluation of methodology for detecting/predicting migration of forest species.
• Leak, William B. 1996. Long-term structural change in uneven-aged northern hardwoods.
• Leak, William B.; Cullen, J.B.; Frieswyk, Thomas S. 1995. Dynamics of whlte pine in New England.
• Solomon, Dale S.; Herman, David A.; Leak, William B. 1995. FIBER 3.0: An Ecological Growth Model for Northeastern Forest Types.
• Solomon, Dale S.; Leak, William B. 1994. Migration of tree species in New England based on elevational and regional analyses.
• Leak, William B.; Yamasaki, Mariko; Smith, Marie-Louise; Funk, David T. 1994. Selection criteria for forested natural areas in New England, USA.
• Leak, William B.; Graber, Raymond E.; Graber, Raymond E. 1993. Six-year beechnut production in New Hampshire.
• Hornbeck, J.W.; Leak, W.B. 1992. Ecology and management of northern hardwood forests in New England.
• DeGraaf, Richard M.; Yamasaki, Mariko; Leak, William B.; Lanier, John W. 1992. New England wildlife: management forested habitats.
• Graber, Raymond E.; Leak, William B.; Leak, William B. 1992. Seed fall in an oldgrowth northern hardwood forest.
• Leak, W.B.; Leak, W.B. 1987. Characteristics of Five Climax Stands in New Hampshire.
• Leak, William B.; Solomon, Dale S.; DeBald, Paul S. 1987. Silvicultural guide for northern hardwood types in the Northeast (revised).
• Solomon, Dale S.; Leak, William B.; Leak, William B. 1986. Simulated yields for managed northern hardwood stands.
• Leak, William B.; Leak, William B. 1985. Relationships of tree age to diameter in old-growth northern hardwoods and spruce-fir.
• Leak, W. B.; Tubbs, C. H. 1983. Percent crown cover tables for applying the shelterwood system in New England.
• Leak, William B. 1983. Stocking, growth, and habitat relations in New Hampshire hardwoods.
• Leak, William B. 1982. Habitat mapping and interpretation in New England.
• Leak, William B. 1980. Rapid economic analysis of northern hardwood stand improvement options.
• Leak, William B. 1979. Effects of habitat on stand productivity in the White Mountains of New Hampshire.
• Leak, William B.; Riddle, Jane R. 1979. Why trees grow where they do in New Hampshire Forests.
• Lancaster, Kenneth F.; Leak, William B. 1978. A silvicultural guide for white pine in the northeast.
• Leak, W. B. 1978. Relationship of Species and Site Index to Habitat in the White Mountains of New Hampshire.
• Leak, William B. 1978. Relationships of forest vegetation to habitat on two types of glacial drift in New Hampshire.
• Leak, W. B. 1976. Relation of Tolerant Species to Habitat in the White Mountains of New Hampshire.
• Leak, W. B.; Solomon, Dale S. 1975. Influence of residual stand density on regeneration of northern hardwoods.
• Leak, William B.; Martin, C. Wayne. 1975. Relationship of stand age to streamwater nitrate in New Hampshire.
• Leak, William B.; Filip, Stanley M. 1975. Uneven-aged management of northern hardwoods in New England.
• Leak, William B.; Graber, Raymond E. 1974. Forest vegetation related to elevation in the White Mountains of New Hampshire.
• Leak, William B. 1974. Some effects of forest preservation.
• Philbrook, James S.; Barrett, James P.; Leak, William B. 1973. A stocking guide for eastern white pine.
• Leak, W. B. 1973. Species and structure of a virgin northern hardwood stand in New Hampshire.
• Leak, William B.; Filip, Stanley M.; Filip, Stanley M. 1970. Cutting strategies and timber yields for unbalanced even-aged northern hardwood forests.
• Leak, William B. 1970. Some preliminary estimates of energy utilization in even-aged northern hardwoods.
• Leak, William B.; Allen, Peter H.; Barrett, James P.; Beyer, Frank K.; Mader, Donald L.; Mawson, Joseph C.; Wilson, Robert K.; Wilson, Robert K. 1970. Yields of eastern white pine in New England related to age, site and stocking.
• Leak, William B.; Solomon, Dale S.; Filip, Stanley M.; Filip, Stanley M. 1969. A silvicultural guide for northern hardwoods in the northeast.
• Leak, William B. 1969. Financial maturity of yellow birch.
• Solomon, Dale S.; Leak, William B. 1969. Stocking, growth, and yield of birch stands.
• Leak, William B. 1968. Birch regeneration: a stochastic model.
• Leak, William B.; Filip, Stanley M.; Solomon, Dale S. 1968. Rates of value increase for yellow birch in New England.
• Leak, William B. 1964. Estimating maximum allowable timber yields by linear programming.
• Leak, William B. 1963. Effects of Seedbed, Overstory, and Understory on White Ash regeneration.
• Filip, Stanley M.; Leak, William B. 1962. Profitable woodlot management in New England.
• Leak, William B. 1961. Development of second-growth northern hardwoods on Bartlett Experimental Forest - a 25-year record.
• Filip, Stanley M.; Marquis, David A.; Leak, William B. 1960. Development of old-growth northern hardwoods on Bartlett Experimental Forest - a 22-year record.
• Leak, William B.; Wilson, Robert W., Jr. 1958. Regeneration after cutting of old-growth northern hardwoods in New Hampshire.
• Leak, William B. 1958. Silvical characteristics of sweet birch (Betula lenta).

Research Highlights

Highlight	Title	Year
NRS-2016-118	Has Climate Affected Tree Species Distribution in New England? Remeasurement of plots 70 years after establishment on the White Mountain National Forest shows no evidence of changes in elevations among clima ...	2016
NRS-2015-208	No Signifigant Losses of Stand Productivity From Whole-tree Harvesting and Clearcutting in New England Forests Silviculturalists have been concerned over nutrient losses from clearcutting and, more recently, whole-tree harvesting in New England since the ...	2015
NRS-2014-038	Silvicultural Guide for Northern Hardwoods in the Northeast Updated This revision of the 1987 silvicultural guide updates and expands the silvicultural information on northern hardwoods. It provides additional i ...	2014