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218 results found
Aspen (Populus tremuloides) is an important component of the resource of the Lake States of Michigan, Minnesota, and Wisconsin. In recent years, a concern has surfaced that the aspen cut will exceed its growth. This concern arises from the increased demand placed on the aspen resource by paper,…
Author(s): David E. Kretschmann, J. G. Isebrands, Glen Stanosz
Keywords: Populus tremuloides, Hybrids, Structural timbers, Lumber, Mechanical properties, Wood properties, Lake states of USA
Source: 21st Session of the International Poplar Commission (IPC 2000) : poplar and willow culture : meeting the needs of society and the environment. St. Paul, Minn. : U.S. Dept. of Agriculture, Forest Service, North Central Research Station, 2000. General technical report NC ; 215:p. 100.
Year: 2000
Cis-11-tetradecenal was found to be the specific attractant for adult male large aspen tortrix, Choristoneura conflictana (Walker), populations in quaking aspen, Populus tremuloides Michx., forests of interior Alaska. The attractant was dispersed from polyethylene caps in Pherocon…
Author(s): Richard A. Werner, J. Weatherston
Keywords: Attractants (chemical, forest pest control, pheromones, large aspen tortrix, Choristoneura conflictana, quaking aspen, Populus tremuloides, Alaska (interior)
Source: Res. Note PNW-RN-354. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 4 p
Year: 1980
Rooted cuttings from three aspen (Populus tremuloides Michx.) clones (216, 271 and 259, classified as high, intermediate and low in O3 tolerance, respectively) were exposed to either diumal O3 profiles simulating those of Michigan's Lower Peninsula (episodic treatments), or diurnal square-wave O3…
Author(s): M.D. Coleman, J.G. Isebrands, R.E. Dickson, D.F. Karnosky
Keywords: biomass production, leaf abscission, leaf age classes, photosynthesis, photosynthetic light-response curves, Populus tremuloides, whole-tree photosynthesis
Source: Tree Physiology 15, 585--592
Year: 1995
Clones of aspen (Populus tremuloides Michx.) were identified that differ in biomass production in response to O3exposure. 14Carbon tracer studies were used to determine if the differences in biomass response were linked to shifts in carbon allocation and carbon partitioning patterns. Rooted…
Author(s): M.D. Coleman, R.E. Dickson, J.G. Isebrands, D.F. Karnosky
Keywords: air pollution, carbohydrates, photosynthesis, Populus tremuloides
Source: Tree Physiology 15, 593-604
Year: 1995
We studied root growth and respiration of potted plants and field-grown aspen trees (Populus tremuloides Michx.) exposed to ambient or twice-ambient ozone. Root dry weight of potted plants decreased up to 45% after 12 weeks of ozone treatment, and root system respiration decreased by 27%. The ozone…
Author(s): M.D. Coleman, R.E. Dickson, J.G. Isebrands, D.F. Karnosky
Keywords: fine root dynamics, growth respiration, maintenance respiration, Populus tremuloides, root respiration, soil CO2 efflux
Source: Tree Physiology 16, 145-152
Year: 1996
To study the impact of ozone (O3) and O3 plus CO2 on aspen growth, we planted two trembling aspen clones, differing in sensitivity to O3, in the ground in open-top chambers and exposed them to different concentrations of O3 and O3 plus CO2 for 98 days. Ozone exposure (58 to 97 µl1-1-h, total…
Author(s): Richard E. Dickson, M.D. Coleman, Priit Pechter, David Karnosky
Keywords: Populus tremuloides, Ozone exposure, Elevated CO2, Crown architecture, Genotypic response
Source: Environmental Pollution 115 (2001) 319-334
Year: 2001
The current status and trend of aspen is a topic of debate; some studies have claimed dramatic reductions in aspen stands while others have found no major changes. The actual picture of aspen forests across the West is variable, and the presence of conifers and ungulates in aspen may or may not…
Author(s): Wayne D. Shepperd, Dan Binkley, Dale L. Bartos, Thomas J. Stohlgren, Lane G. Eskew
Keywords: ecosystem management, ecosystem research, sustainable forests, quaking aspen, Populus tremuloides
Source: Proceedings RMRS-P-18. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 460 p.
Year: 2001
Turkeys (Meleagris gallapovo) selected nest sites that provided good horizontal concealment. Rock or rock outcrops were selected most frequently for nest concealment on first-nest attempts. Renest attempts showed a selection preference for shrubs as nest cover; most of these were located in meadows…
Author(s): Mark A. Rumble, Stanley H. Anderson
Keywords: Meleagris gallapovo, Pinus ponderosa, Populus tremuloides, Betula papyrifera, habitats, nesting, forest ecology, Black Hills, South Dakota, Wyoming
Source: In: Fisser, H. G., ed. Wyoming shrublands: proceedings of the sixteenth Wyoming shrub ecology workshop, Sundance, Wyoming, May 26 & 27, 1987. Laramie, WY: The Workshop, Dept. of Range Management: 36-39
Year: 1987
A wildfire in the Chiricahua Mountains of southeastern Arizona apparently altered the long-term structure of the forest. The pre-fire canopy forest, which had not burned for 100 years, was an even mixture of Arizona pines and Rocky Mountain Douglas-firs. A decade later the new forest was…
Author(s): Ronald D. Quinn, Lin Wu
Keywords: Populus tremuloides, Pinus ponderosa, Pseudotsuga menziesii, wildfires, stand structure, species composition, regeneration
Source: Gottfried, Gerald J.; Gebow, Brooke S.; Eskew, Lane G.; Edminster, Carleton B., comps. Connecting mountain islands and desert seas: biodiversity and management of the Madrean Archipelago II. Proc. RMRS-P-36. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station: 474-478
Year: 2005
1. Competition effects on growth of individual trees were examined for 4 years in aggrading, mixed-clone stands of trembling aspen (Populus tremuloides Michx.) at the Aspen-FACE free-air Co2 and O3 enrichment facility in northern Wisconsin, USA. During each growing season stands received one of…
Author(s): E. P. McDonald, E. L. Kruger, D. E. Riemenschneider, J. G. Isebrands
Keywords: Competitive interactions, FACE, global change, Populus tremuloides
Source: Functional Ecology 16:792-801
Year: 2002