The influence of successional processes and disturbance on the structure of Tsuga Canadensis forests

Ecological Applications

Volumn 18, Issue 5, 2008, Pages 1182-1199

  D'Amato, Anthony W ^a,b,c   Orwig, David A ^b   Foster, David R ^b  

^a UNIVERSITY OF MINNESOTA   (United States)

^b UNIVERSITY OF MASSACHUSETTS   (United States)

^c HARVARD UNIVERSITY   (United States)

Author keywords

Coarse woody debris; Dendroecology; Forest structure; Gap dynamics; Massachusetts; Natural disturbance based silviculture; Old growth; Size class distributions; Stand development; Tsuga Canadensis

Indexed keywords

COARSE WOODY DEBRIS; COMPARATIVE STUDY; COMPLEXITY; CONIFEROUS FOREST; ECOLOGICAL MODELING; ENVIRONMENTAL DISTURBANCE; GAP DYNAMICS; OLD-GROWTH FOREST; SECONDARY FOREST; SIZE DISTRIBUTION; SNAG; STAND STRUCTURE; SUCCESSION;

MASSACHUSETTS; NORTH AMERICA; UNITED STATES;

CONIUM; TSUGA; TSUGA CANADENSIS;

ARTICLE; PHYSIOLOGY; TSUGA; UNITED STATES;

MASSACHUSETTS; TSUGA;

EID: 55949089014     PISSN: 10510761     EISSN: None     Source Type: Journal    
DOI: 10.1890/07-0919.1     Document Type: Article

References (133)

1. Abrams, M. D., and D. A. Orwig. 1996. A 300-year history of disturbance and canopy recruitment for co-occurring white pine and hemlock on the Allegheny Plateau, USA. Journal of Ecology 84:353-363.
2. Anderson, D. R., K. P. Burnham, and W. L. Thompson. 2000. Null hypothesis testing: problems, prevalence, and an alternative. Journal of Wildlife Management 64:912-923.
3. Avery, J., and T. Slack. 1926. Map of Mohawk Trail State Forest. Massachusetts Department of Conservation and Recreation, Amherst, Massachusetts, USA.
4. Boose, E. R., K. E. Chamberlain, and D. R. Foster. 2001. Landscape and regional impacts of hurricanes in New England. Ecological Monographs 71:27-48.
5. Boulanger, Y., and L. Sirois. 2006. Postfire dynamics of black spruce coarse woody debris in northern boreal forest of Quebec. Canadian Journal of Forest Research 36:1770-1780.
6. Bragg, D. C., M. G. Shelton, and B. Zeide. 2003. Impacts and management implications of ice storms on forests in the southern United States. Forest Ecology and Management 186:99-123.
7. Burnham, K. P., and D. R. Anderson. 1998. Model selection and inference: a practical information-theoretic approach. Springer-Verlag, New York, New York, USA.
8. Burnham. K. P., and D. R. Anderson. 2001. Kullback-Leibler information as a basis for strong inference in ecological studies. Wildlife Research 28:111-119.
9. Busing, R. T. 2005. Tree mortality, canopy turnover, and woody detritus in old cove forests of the southern Appalachians. Ecology 86:73-84.
10. Chokkalingam, U., and A. S. White. 2001. Structure and spatial patterns of trees in old-growth northern hardwood and mixed forests of northern Maine. Plant Ecology 156:139-160.
11. Christensen, M., K. Hahn, E. P. Mountford, P. Ódor, T. Standovár, D. Rozenbergar, J. Diaci, S. Wijdeven, P. Meyer, S. Winter, and T. Vrska. 2005. Dead wood in European beech (Fagus sylvatica) forest reserves. Forest Ecology and Management 210:267-282.
12. Clark, D. F., D. D. Kneeshaw, P. J. Burton, and J. A. Antos. 1998. Coarse woody debris in sub-boreal spruce forests of west-central British Columbia. Canadian Journal of Forest Research 28:284-290.
13. Crow, T. R., D. S. Buckley, E. A. Naucrtz, and J. C. Zasada. 2002. Effects of management on the composition and structure of northern hardwood forests in upper Michigan. Forest Science 48:129-145.
14. Dahir, S. E., and C. G. Lorimer. 1996. Variation in canopy gap formation among developmental stages of northern hardwood stands. Canadian Journal of Forest Research 26: 1875-1892.
15. D'Amato, A. W., and P. C. Catanzaro. 2007. Restoring oldg-rowth characteristics. Cooperative Extension Landowner Outreach, University of Massachusetts, Amherst, Massachusetts, USA.
16. D'Amato, A. W., and D. A. Orwig. 2008. Stand and landscapelevel disturbance dynamics in old-growth forest ecosystems in western Massachusetts. Ecology 89: in press.
17. D'Amato, A. W., D. A. Orwig, and D. R. Foster. 2006. New estimates of Massachusetts old-growth forests: useful data for regional conservation and forest reserve planning. Northeastern Naturalist 13:495-506.
18. Dunwiddie, P. W., and R. T. Leverett. 1996. Survey of old-growth forests in Massachusetts. Rhodora 98:419-444.
19. Durand, D., and J. A. Greenwood. 1958. Modifications of the Raylcigh test for uniformity in analysis of two-dimensional orientation of data. Journal of Geology 66:229-238.
20. Field, D. D., and C. Dewey. 1829. A history of the county of Berkshire, Massachusetts, in two parts. S.W. Bush, Pittsfield, Massachusetts, USA.
21. FIA (Forest Inventory and Analysis), 2005. Forest inventory and analysis national core field guide. Volume 1: field data collection procedures for phase 2 plots. Version 3.0. U.S. Forest Service, Arlington, Virginia. USA.
22. Filip, S. M., D. A, Marquis, and W. B. Leak. 1960, Development of old-growth northern hardwoods on Bartlett Experimental Forest - a 22-year record. U.S. Forest Service, Northeastern Forest Experiment Station Paper 135. U.S. Forest Service. Washington. D.C., USA.
23. Ford, E. D. 1975. Competition and stand structure in some even-aged plant monocultures. Journal of Ecology 63: 311-333.
24. Foster, D. R. 1988. Disturbance history, community organization and vegetation dynamics of the old-growth Pisgah Forest, southwestern New Hampshire, USA. Journal of Ecology 76:105-34.
25. Fraver, S. 2004. Spatial and temporal patterns of natural disturbance in old-growth forests of northern Maine, USA. Dissertation. University of Maine, Orono, Maine, USA.
26. Fraver, S., R. G. Wagner, and M. Day. 2002. Dynamics of coarse woody debris following gap harvesting in an Acadian forest of central Maine, USA. Canadian Journal of Forest Research 32:2094-2105.
27. Fraver, S., and A. S. White. 2005a. Identifying growth releases in dendrochronological studies of forest disturbance. Canadian Journal of Forest Research 35:1648-1656.
28. Fraver, S., and A. S. White, 2005b. Disturbance dynamics of old-growth Picea rubens forests of northern Maine. Journal of Vegetation Science 16:597-610.
29. Frelich, L. E. 2002. Forest dynamics and disturbance regimes. Cambridge University Press, Cambridge, UK.
30. Frelich, L. E., and C. G. Lorimer. 1985. Current and predicted long-term effects of deer browsing in hemlock forests in Michigan, USA. Biological Conservation 34:99-120.
31. Fritts, H. C., and T. W. Swetnam. 1989. Dendrochronology: a tool for evaluating variations in past and present environment. Advances in Ecological Research 19:111-189.
32. Goff, F. G., and D. West. 1975. Canopy-understory interaction effects on forest population structure. Forest Science 21: 98-108.
33. Goodburn, J. M., and C. G. Lorimer. 1998. Cavity and coarse woody debris in old-growth and managed northern hardwood forests in Wisconsin and Michigan. Canadian Journal of Forest Research 28:427-438.
34. Goodburn, J. M., and C. G. Lorimer. 1999. Population structure in old-growth and managed northern hardwoods: an examination of the balanced diameter distribution concept. Forest Ecology and Management 118:11-29.
35. Gore, J. A., and W. A. Patterson III. 1986. Mass of downed wood in northern hardwood forests in New Hampshire: potential effects of forest management. Canadian Journal of Forest Research 16:335-339.
36. Greenwood, J. A., and D. Durand. 1955. The distribution of length and components of the sum of n random unit vectors. Annals of Mathematics and Statistics 26:233-246.
37. Hansen, E. M., and E. M. Goheen. 2000. Phellinus weirii and other native root pathogens as determinants of forest structure and process in western North America. Annual Review of Phytopathology 38:515-539.
38. Harmon, M. E., et al. 1986. Ecology of coarse woody debris in temperate ecosystems. Advances in Ecological Research 15: 133-302.
39. Harmon, M. E., and J. Sexton. 1996. Guidelines for measurements of woody detritus in forest ecosystems. Publication number 20. U.S. Long-term Ecological Research Network Office, University of Washington, Seattle, Washington, USA.
40. Hély, C., Y. Bergeron, and M. D. Flannigan. 2000. Coarse woody debris in the southeastern Canadian boreal forest: composition and load variations in relation to stand replacement. Canadian Journal of Forest Research 30: 674-687.
41. Hennon, P. E., and M. H. McClellan. 2003. Tree mortality and forest structure in the temperate rain forests of southeast Alaska. Canadian Journal of Forest Research 33:1621-1634.
42. Henry, J. D., and J. M. A. Swan. 1974. Reconstructing forest history from live and dead plant material - an approach to the studv of forest succession in southwest New Hampshire. Ecology 55:772-783.
43. Hett, J. M., and O. L. Loucks. 1976. Age structure models of balsam fir and eastern hemlock. Journal of Ecology 64: 1029-1044.
44. Hooper, M. C., K. Arii, and M. J. Lechowicz. 2001. Impact of a major ice storm on an old-growth northern hardwood forest. Canadian Journal of Botany 79:70-75.
45. Hornbeck, J. W., and W. B. Leak. 1992. Ecology and management of northern hardwood forests in New England. U.S. Forest Service General Technical Report NE-159. U.S. Forest Service, Washington, D.C., USA.
46. Hough, A. F. 1932. Some diameter distributions in forest stands of northwestern Pennsylvania. Journal of Forestry 30: 933-943.
47. Houston, D. R. 1994. Major new tree disease epidemics: beech bark disease. Annual Review of Phytopathology 32:75-87.
48. Hunter, M. L., Jr. 1999. Maintaining biodiversity in forest ecosystems, Cambridge University Press, Cambridge, UK.
49. Keeton, W. S. 2006. Managing for late-successional/old-growth characteristics in northern hardwood-conifer forests. Forest Ecology and Management 235:129-142.
50. Kirby, K. J., C. M. Reid, R. C. Thomas, and F. B. Goldsmith. 1998. Preliminary estimates of fallen deadwood and standing dead trees in managed and unmanaged forests in Britain. Journal of Applied Ecology 35:148-155.
51. Kovach, W. L. 1994. Oriana for Windows, version 2.0. Kovach Computing Services, Pentraeth, Wales, UK.
52. Kulakowski, D., and T. T. Veblen. 2003. Subalpine forest development following a blowdown in the Mount Zirkel Wilderness, Colorado. Journal of Vegetation Science 14:653-660.
53. Leak, W. B. 1964. An expression of diameter distribution for unbalanced, uneven-aged stands and forests. Forest Science 10:39-50.
54. Leak, W. B. 1996. Long-term structural change in uneven-aged northern hardwoods. Forest Science 42:160-165.
55. Lee, P. C., S. Crites, M. Nietfield, H. Van Nguyen, and J. B. Stelfox. 1997. Characteristics and origins of deadwood material in aspen-dominated boreal forests. Ecological Applications 7:691-701.
56. Lester, A. M. 2003. Dynamics of coarse woody debris in transitional northern hardwood forests. Thesis. University of Massachusetts, Amherst, Massachusetts, USA.
57. Lindenmayer, D. B., and J. F. Franklin. 2002. Conserving forest biodiversity: a comprehensive multiscale approach. Island Press, Washington, D.C., USA.
58. Linder, P., B. Elfving, and O. Zackrisson. 1997. Stand structure and successional trends in virgin boreal forest reserves in Sweden. Forest Ecology and Management 98:17-33.
59. Lorimer, C. G. 1980. Age structure and disturbance history of a southern Appalachian virgin forest. Ecology 61:1169-1184.
60. Lorimer, C. G. 1989. Relative effects of small and large disturbances on temperate hardwood forest structure. Ecology 70:565-567.
61. Lorimer, C. G., S. E. Dahir, and E. V. Nordheim. 2001. Tree mortality rates and longevity in mature and old-growth hemlock-hardwood forests. Journal of Ecology 89:960-971.
62. Lorimer, C. G., and L. E. Frelich. 1984. A simulation of equilibrium diameter distributions of sugar maple (Acer saccharum). Bulletin of the Torrey Botanical Club 111: 193-199.
63. Lorimcr, C. G., and L. E. Frelich. 1989. A method for estimating canopy disturbance frequency and intensity in dense temperate forests. Canadian Journal of Forest Research 19:651-663.
64. Lorimer, C. G., and L. E. Frelich. 1998. A structural alternative to chronosequence analysis for uneven-aged northern hardwood forests. Journal of Sustainable Forestry 6:347-366.
65. Lorimer, C. G., L. E. Frelich, and E. V. Nordheim. 1988. Estimating gap origin probabilities for canopy trees, Ecology 69:778-785.
66. Lorimer, C. G., and A. G. Krug. 1983. Diameter distributions in even-aged stands of shade-tolerant and midtolerant tree species. American Midland Naturalist 109:331-345.
67. Maguire, C. C., and C. L. Chambers. 2005. College of forestry integrated research project: ecological and socioeconomic responses to alternative silvicultural treatments. Research Contribution 46, Forest Research Laboratory, Oregon State University, Corvallis, Oregon, USA.
68. Mathewson, B. 2006. A comparison of eastern red-backed salamander populations in hemlock-dominated and mixed deciduous forests in north central Massachusetts. Thesis. Harvard Forest, Harvard University, Cambridge, Massachusetts, USA.
69. McComb, W. C. 2003. Ecology of coarse woody debris and its role as habitat for mammals. Pages 335-372 in C. J. Zabel and R. G. Anthony, editors. Mammal community dynamics: management and conservation in the coniferous forests of western North America. Cambridge University Press, Cambridge, UK.
70. McComb, W. C., and R. N. Muller. 1983. Snag densities in old-growth and second-growth Appalachian forests, Journal of Wildlife Management 47:376-382.
71. McComb, W. C., T. A. Spies, and W. H. Emmingham. 1993. Douglas-fir forests: managing for timber and mature forest habitat. Journal of Forestry 91:31-42.
72. McGee, G. G., D. J. Leopold, and R. D. Nyland. 1999. Structural characteristics of old-growth, maturing, and partially cut northern hardwood forests. Ecological Applications 9:1316-1329.
73. McLachlan, J., D. R. Foster, and F. Menalled. 2000. Anthropogenic ties to late-successional structure and composition in four New England hemlock stands. Ecology 81: 717-733.
74. Meyer, H. A. 1952. Structure, growth, and drain in balanced, uneven-aged forests. Journal of Forestry 52:85-92.
75. Meyer, H. A., and D. D. Stevenson. 1943. The structure and growth of virgin becch-birch-maple-hemlock forests in northern Pennsylvania. Journal of Agricultural Research 67:465-484.
76. Muller, R. N. 1982. Vegetation patterns in the mixed mesophytic forests of eastern Kentucky. Ecology 63:1901-1907.
77. Muller, R. N. 2003. Landscape patterns of change in coarse woody debris accumulation in an old-growth deciduous forest on the Cumberland Plateau, southeastern Kentucky. Canadian Journal of Forest Research 33:763-769.
78. Neuendorff, J. K., L. M. Nagel, C. R. Webster, and M. K. Janowiak. 2007. Stand structure and composition in a northern hardwood forests after 40 years of single-tree selection. Northern Journal of Applied Forestry 24:197-202.
79. Nowacki, G. J., and M. D. Abrams. 1997. Radial-growth averaging criteria for reconstructing disturbance histories from presettlement-origin oaks. Ecological Monographs 67: 225-249.
80. O'Hara, K. L. 1998. Silviculture for structural diversity: a new look at multi-aged systems. Journal of Forestry 96:4-10.
81. O'Hara, K. L. 2001. The silviculture of transformation - a commentary. Forest Ecology and Management 151:81-86.
82. Oliver, C. D. 1978. The development of northern red oak in mixed stands in central New England. School of Forestry and Environmental Studies Bulletin Number 91. Yale University New Haven Connecticut, USA.
83. Oliver, C. D. 1981. Forest development in North America following major disturbances. Forest Ecology and Management 3:153-168.
84. Oliver, C. D., and B. C. Larson. 1996. Forest stand dynamics. John Wiley and Sons, New York, New York, USA.
85. Oliver, C. D., and E. P. Stephens. 1977. Reconstruction of a mixed-species forest in central New England. Ecology 58: 562-572.
86. Orwig, D. A., C. V. Cogbill, D. R. Foster, and J. F. O'Keefe. 2001. Variations in old-growth structure and definitions: forest dynamics on Wachusett Mountain, Massachusetts. Ecological Applications 11:437-452.
87. Orwig, D. A., and D. R. Foster. 1998. Forest response to the introduced hemlock woolly adelgid in southern New England, USA. Journal of the Torrey Botanical Society 125:60-73.
88. Palik, B. J., and J. Robl. 1999. Structural legacies of catastrophic windstorm in a mature Great Lakes aspen forest. U.S. Forest Service, Research Paper, NC-337. U.S. Forest Service, Washington, D.C., USA.
89. Parker, G. R., D. J. Leopold, and J. K. Eichenberger. 1985. Tree dynamics in an old-growth deciduous forest. Forest Ecology and Management 11:31-57.
90. Peterken, G. F. 1996. Natural woodland: ecology and conservation in northern temperate regions. Cambridge University Press, Cambridge, UK.
91. Peterson, C. J., and S. T."a. Pickett. 1991. Treefall and resprouting following catastrophic windthrow in an old-growth hemlock-hardwoods forest. Forest Ecology and Management 42:205-217.
92. Putz, F. E., P. D. Coley, K. Lu, A. Montvalo, and A. Aiello. 1983. Uprooting and snapping of trees: structural determinants and ecological consequences, Canadian Journal of Forest Research 13:1011-1020.
93. Rebertus, A. J., S. R. Shifley, R. H. Richards, and L. M. Roovers. 1997. Ice storm damage to an old-growth oakhickory forest in Missouri. American Midland Naturalist 137:48-61.
94. Rice, W. R. 1989. Analyzing tables of statistical tests. Evolution 43:223-225.
95. Robertson, P. A., G. T. Weaver, and J. A. Cavanaugh. 1978. Vegetation and tree species patterns near the northern terminus of the southern floodplain forest. Ecological Monographs 48:249-267.
96. Rose, C. L., B. G. Marcot, T. K. Meilen, J. L. Ohman, K. L. Waddell, D. L. Lindley, and B. Schreiber. 2001. Decaying wood in Pacific Northwest forests: concepts and tools for habitat management. Pages 580-623 in D. H. Johnson and T. A. O'Neill, editors. Wildlife-habitat relationships in Oregon and Washington. Oregon State University Press, Corvallis, Oregon, USA.
97. Rubin, B. D., P. D. Manion, and D. Faber-Langendoen. 2006. Diameter distributions and structural sustainability in forests. Forest Ecology and Management 222:427-438.
98. Runkle, J. R. 1982. Patterns of disturbance in some old-growth mesic forests of eastern North America. Ecology 63: 1533-1546.
99. Runkle, J. R. 1992. Guidelines and sample protocol for sampling forest gaps. U.S. Forest Service General Technical Report PNW-GTR-283, U.S. Forest Service, Washington, D.C., USA.
100. Runkle, J. R. 2000. Canopy tree turnover in old-growth mesic forests of eastern North America. Ecology 81:554-567.
101. SAS Institute. 2004. SAS/STAT user's guide: version 9.1. SAS Institute, Cary, North Carolina, USA.
102. Scanu, R. J. 1988. Soil survey of Berkshire County, Massachusetts. USDA, Soil Conservation Service, Amherst, Massachusetts, USA.
103. Schmelz, D. V., and A. A. Lindsey. 1965. Size-class structure of old-growth forests in Indiana. Forest Science 11:258-264.
104. Schoonmaker, P. K., Jr. 1992. Long-term vegetation dynamics in southwestern New Hampshire. Dissertation. Harvard University. Cambridge, Massachusetts, USA.
105. Seymour, R. S., and M. L. Hunter, Jr. 1999. Principles of ecological forestry. Pages 22-61 in M. L. Hunter, Jr., editor. Maintaining biodiversity in forest ecosystems. Cambridge University Press, Cambridge, UK.
106. Seymour, R. S., A. S. White, and P. G. deMaynadier. 2002. Natural disturbance regimes in northeastern North Americaevaluating silvicultural systems using natural scales and frequencies. Forest Ecology and Management 155:357-367.
107. Singer, M. T., and C. G. Lorimer. 1997. Crown release as a potential old-growth restoration approach in northern hardwoods. Canadian Journal of Forest Research 27: 1222-1232.
108. Spetich, M. A., S. R. Shirley, and G. R. Parker. 1999. Regional distribution and dynamics of coarse woody debris in Midwestern old-growth forests. Forest Science 45:302-313.
109. Spies, T. A. 1998. Forest structure: a key to the ecosystem. Northwest Science 72:34-39.
110. Spies, T. A., and J. F. Franklin. 1991. The structure of natural young, mature, and old-growth Douglas-fir forests. Pages 91-110 in L. F. Ruggiero, K. B. Aubry, A. B. Carey, and M. H. Huff, technical coordinators. Wildlife and vegetation of unmanaged Douglas-fir forests. U.S. Forest Service General Technical Report PNW-GTR-285.
111. Spies, T. A., J. F. Franklin, and M. Klopsch. 1990. Canopy gaps in Douglas-fir forests of the Cascade Mountains. Canadian Journal of Forest Research 20:649-658.
112. Spies, T. A., J. F. Franklin, and T. B. Thomas. 1988. Coarse woody debris in Douglas-fir forests of western Oregon and Washington. Ecology 69:1689-1702.
113. Sturtevant, B. R., J. A. Bissonette, J. N. Long, and D. W. Roberts. 1997. Coarse woody debris as a function of age, stand structure, and disturbance in boreal Newfoundland. Ecological Applications 7:702-712.
114. Tappeiner, J. C., D. Huffman, D. Marshall, T. A. Spies, and J. D. Bailey. 1997. Density, ages, and growth rates in old-growth and young-growth forests in coastal Oregon. Canadian Journal of Forest Research 27:638-648.
115. Tinker, D. B., and D. H. Knight. 2000. Coarse woody debris following fire and logging in Wyoming lodgepole pine forests. Ecosystems 3:472-483.
116. Tyrrell, L. E., and T. R. Crow. 1994a. Structural characteristics of old-growth hemlock-hardwood forests in relation to age. Ecology 75:370-386.
117. Tyrrell, L. E., and T. R. Crow. 19946. Dynamics of dead wood in old-growth hemlock-hardwood forests of northern Wisconsin and northern Michigan. Canadian Journal of Forest Research 24:1672-1683.
118. Veblen, T. T. 1986. Age and size structure of subalpine forests in the Colorado Front Range. Bulletin of the Torrey Botanical Club 113:225-240.
119. van Wagner, C. E. 1968. The line intersect method in forest fuel sampling. Forest Science 14:20-26.
120. Ward, J. S., and D. M. Smith. 1999. Dynamics of Connecticut hemlock stands. Pages 50-54 in K. A. McManus, K. S. Shields, and D. R. Souto, editors. Proceedings: Symposium on Sustainable Management of Hemlock Ecosystems in Eastern North America, June 22-24, 1999. U.S. Forest Service General Technical Report NE-267. U.S. Forest Service, Washington, D.C., USA.
121. Weisburg, P. J. 2004. The importance of non-stand-replacing fire for the development of forest structure in the Pacific Northwest, USA. Forest Science 50:245-258.
122. Westphal, C., N. Tremer, G. von Oheimb, J. Hansen, K. von Gadow, and W. Härdtlc. 2006. Is the reverse J-shaped diameter distribution universally applicable in European virgin beech forests? Forest Ecology and Management 223: 75-83.
123. Wilson, B. F., and B. C. McComb. 2005. Dynamics of dead wood over 20 years in a New England oak forest. Canadian Journal of Forest Research 35:682-692.
124. Winter, L. E., L. B. Brubaker, J. F. Franklin, E. A. Miller, and D. Q. DeWitt. 2002, Canopy disturbances over the fivecentury lifetime of an old-growth Douglas-fir stand in the Pacific Northwest. Canadian Journal of Forest Research 32: 1057-1070.
125. Woldendorp, G., R. J. Keenan, S. Barry, and R. D. Spencer. 2004. Analysis of sampling methods for coarse woody debris. Forest Ecology and Management 198:133-148.
126. Woods, K. D. 2000a. Dynamics in late-successional hemlock-hardwood forests over three decades. Ecology 81:110-126.
127. Woods, K. D. 2000b. Long-term change and spatial pattern in a late-successional hemlock-northern hardwood forest. Journal of Ecology 88:267-282.
128. Worrall, J. J., T. D. Lee, and T. C. Harrington. 2005. Forest dynamics and agents that initiate and expand canopy gaps in Picea-Abies forests of Crawford Notch, New Hampshire, USA. Journal of Ecology 93:178-190.
129. Youngblood, A., and B. E. Wiekman. 2002. The role of disturbance in creating dead wood: insect defoliation and tree mortality in northeastern Oregon. U.S. Forest Service General Technical Report PSW-GTR-181.
130. Zen, E., G. R. Goldsmith, N. L. Ratcliffe, P. Robinson, and R. S. Stanley. 1983. Bedrock geologic map of Massachusetts. U.S. Department of the Interior. U.S. Geologic Survev. Washington, D.C., USA.
131. Zenner, E. K. 2005. Development of tree-size distributions in Douglas-fir forests under differing disturbance regimes. Ecological Applications 15:701-714.
132. Ziegler, S. S. 2000. A comparison of structural characteristics between old-growth and post-fire second-growth hemlock-hardwood forests in Adirondack Park, New York, U.S.A. Global Ecology and Biogeography 9:373-389.
133. Ziegler, S. S. 2002. Disturbance regimes of hemlock-dominated old-growth forests in northern New York, U.S.A. Canadian Journal of Forest Research 32:2106-2115.