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This atlas presents maps of historical defoliation by the eastern and western spruce budworms and historical outbreaks of the mountain and southern pine beetles during the past half century. The maps encompass various regions of the conterminous United States and eastern Canada. This publication…
Author(s): David W. Williams, Richard A. Birdsey
Keywords: Choristoneura fumiferana, Choristoneura occidentalis, Dendroctonus frontalis, Dendroctonus ponderosae, Lepidoptera, Tortricidae, Coleoptera, Scolytidae, maps, spatial dynamics, disturbance, vegetation models, Canada
Source: Gen. Tech. Rep. NE-308. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 33 p.
Year: 2003
The Interior Northwest Landscape Analysis System (INLAS) links a number of resource, disturbance, and landscape simulations models to examine the interactions of vegetative succession, management, and disturbance with policy goals. The effects of natural disturbance like wildfire, herbivory, forest…
Author(s): Jane L. Hayes, Alan. A. Ager, R. James Barbour
Keywords: Forest simulation analysis, midscale, vegetation succession, disturbance, management
Source: Gen. Tech. Rep. PNW-GTR-610. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 218 p
Year: 2004
Large commercial crops of morels are harvested annually from montane coniferous forests of the Northwestern United States. Although some morels fruit annually in nondisturbed forests, others fruit copiously in areas experiencing fire, insect infestations, tree mortality, and soil disturbance. Many…
Author(s): David Pilz, Nancy S. Weber, M. Carol Carter, Catherine G. Parks, Randy Molina
Keywords: Morchella, mushrooms, fire, species diversity, genetics, disturbance, nontimber forest products
Source: Forest Ecology and Management. 198: 367-386
Year: 2004
We examined the process of fragmentation in a managed forest landscape by comparing rates and patterns of disturbance (primarily clear-cutting) and regrowth between 1972 and 1988 using Landsat imagery. A 2589-km2 managed forest landscape in western Oregon was classified into two forest types,…
Author(s): T.A. Spies, W.J. Ripple, G.A. Bradshaw
Keywords: clear-cutting, disturbance, edge habitat, forest management, habitat fragmentation, heterogeneity, interior habitat, landscape pattern, patchiness, remote sensing
Source: Ecological Applications. 4(3): 555-568
Year: 1994
Southern Appalachian forests are undergoing considerable change due to altered disturbance regimes. For example, fire exclusion has had a major impact on the structure and function of pine-hardwood ecosystems. Recently, fire has been prescribed for a variety of applications: 1) stand-replacement in…
Author(s): Barton D. Clinton, James M. Vose, Jennifer D. Knoepp, Katherine J. Elliott
Keywords: disturbance, ecosystems, nitrate response, old growth, North Carolina, prescribed fire, resistance, riparian zone, southern Appalachia, stream
Source: Pages 174-181 in K.E.M. Galley, R.C. Klinger, and N.G Sugihara (eds.). Proceedings of Fire Conference 2000: The First National Congress on Fire Ecology, Prevention, and Management. Miscellaneous Publication No. 13, Tall Timbers Research Station, Tallahassee, FL
Year: 2003
Paleo-vegetation studies have shown that vegetation has changed in composition and extent in the intermountain Pacific Northwest over the past 20,000 years. Today, both natural and human-induced disturbances have long-term influence on the structure and composition of eastside vegetation.…
Author(s): Charles G. Johnson, Rodrick R. Clausnitzer, Peter J. Mehringer, Chadwick D. Oliver
Keywords: Pleistocene vegetation, pollen analysis, disturbance, stand development, succession, steepe ecosystem, forest ecosystem, shrublands, scablands, landscape
Source: Gen. Tech. Rep. PNW-GTR-322. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 66 p. (Everett, Richard L., assessment team leader; Eastside forest ecosystem health assessment; Hessburg, Paul F., science team leader and tech. ed., Volume III: assessment.)
Year: 1994
We analyzed historical and current vegetation composition and structure in 49 sample watersheds, primarily on National Forests, within six river basins in eastern Oregon and Washington. Vegetation patterns were mapped from aerial photographs taken from 1932 to 1959, and from 1985 to 1992. We…
Author(s): J.F. Lehmkuhl, P.F. Hessburg, R.L. Everett, M.H. Huff, R.D. Ottmar
Keywords: Historical vegetation, landscape pattern, insect and disease hazard, range of variation, scale, forest health, disturbance, fire suppression, Oregon, Washington, Cascades, Blue Mountains
Source: Gen. Tech. Rep. PNW-GTR-328. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 88 p. (Everett, Richard L.; team leader; Eastside forest ecosystem health assessment; Hessburg, Paul F., science team leader and tech. ed., Volume III: assessment.)
Year: 1994
Regenerated and remnant forest patches were inventoried in Syracuse, New York, USA to determine differences in structure, species composition, human disturbances, and landscape context. Patches had similar mean stem diameter, total stem density, and total basal areas, but differed with respect to…
Author(s): Wayne C. Zipperer
Keywords: patch origin, disturbance, species composition and structure
Source: Urban Ecosystems. 6: 271-290
Year: 2002
Commercially harvested timberland was analyzed by past and current forest types, stocking, tree density, and volume. Monitoring sample plots by year of harvest gives indications of rates and degree of recovery from harvesting disturbance.
Author(s): James F. Rosson
Keywords: clearcut, cutting, disturbance, forest survey, regeneration, stand establishment
Source: Res. Pap. SO-279. New Orleans, LA: U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station. 22 p.
Year: 1994
Allometric equations were developed to predict aboveground dry weight of herbaceous and woody species on prescribe-burned sites in the Southern Appalachians. Best-fit least-square regression models were developed using diamet,er, height, or both, as the independent variables and dry weight as the…
Author(s): Katherine J. Elliott, Barton D. Clinton
Keywords: mountain-laurel, Kalmia latifolia, xeric upland forests, oak-pine, prescribed fire, disturbance
Source: Res. Note SE-365. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 8 p.
Year: 1993