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Full-Text Articles in Forest Sciences
Toxicity Of Aspen Wood Leachate To Aquatic Life: Laboratory Studies, Barry R. Taylor, J. Stephen Goudey, N. Bruce Carmichael
Toxicity Of Aspen Wood Leachate To Aquatic Life: Laboratory Studies, Barry R. Taylor, J. Stephen Goudey, N. Bruce Carmichael
Aspen Bibliography
Trembling aspen (Populus tremuloides Michx.), a common hardwood tree throughout Canada, is being harvested at increasing rates for use in paper and building materials. Piles of aspen logs have been observed to produce a dark, watery, acutely toxic leachate. A laboratory study was undertaken to elucidate the nature, strength, and persistence of aspen leachate toxicity and the chemical composition of the leachate. Leaching from aspen chips in the laboratory was rapid, with 1% mass loss in the first 24 h. Another 2 weeks of immersion was necessary to remove all remaining leachable material (3% total)> Fresh aspen leachate derived …
Characterization Of Aspen Isoprene Synthase, An Enzyme Responsible For Leaf Isoprene Emission To The Atmosphere, Gary M. Silver, Ray Fall
Characterization Of Aspen Isoprene Synthase, An Enzyme Responsible For Leaf Isoprene Emission To The Atmosphere, Gary M. Silver, Ray Fall
Aspen Bibliography
Isoprene (2-methyl-1,3-butadiene) is a volatile hydrocarbon emitted from many plant species to the atmosphere, where it plays an important role in atmospheric chemistry. An enzyme extracted from aspen (Populus tremuloides) leaves was previously found to catalyze the Mg2+-dependent elimination of pyrophosphate from dimethylallyl diphosphate (DMAPP) to form isoprene (Silver, G. M., and Fall, R.(1991) Plant Physiol. 97, 1588-1591). This enzyme, isoprene synthase, has now been purified 4000-fold to near homogeneity. The enzyme had a native molecular mass of 98-137 kDa and isoelectric point of 4.7 and contained 58- and 62-kDa subunits, implying that it is a heterodimer. …
Carbon Allocation And Partitioning In Aspen Clones Varying In Sensitivity To Tropospheric Ozone, M.D. Coleman, R.E. Dickson, J.G. Isebrands, D.F. Karnosky
Carbon Allocation And Partitioning In Aspen Clones Varying In Sensitivity To Tropospheric Ozone, M.D. Coleman, R.E. Dickson, J.G. Isebrands, D.F. Karnosky
Aspen Bibliography
No abstract provided.
Moose (Alces Alces L.) Browsing In Young Scots Pine Stands In Relation To The Characteristics Of Their Winter Habitats, Risto Heikkila, Sauli Harkonen
Moose (Alces Alces L.) Browsing In Young Scots Pine Stands In Relation To The Characteristics Of Their Winter Habitats, Risto Heikkila, Sauli Harkonen
Aspen Bibliography
Moose (Alces alces L.) browsing was studied in young Scots pine (Pinus sylvestris L.) stands mixed with deciduous trees in high-density winter ranges. The proportional use of twig biomass decreased as the availability increased. The total as well as proportional biomass consumption were higher on the moist than on the dry type of forest. The per tree consumption of pine was higher on the moist type, where the availability of pine was lower. Deciduous trees were more consumed on the moist type, where their availability was relatively high. The consumption of pine saplings increased as the availability of …
Compositions Of Bud And Leaf Exudates Of Some Populus Species, W. Greenaway, J. May, T. Scaysbrook, F.R. Whatley
Compositions Of Bud And Leaf Exudates Of Some Populus Species, W. Greenaway, J. May, T. Scaysbrook, F.R. Whatley
Aspen Bibliography
Bud and leaf exudates from Populus alba, P. balsam ifera, P. nigra and P. tremuloides were analyzed by gas chromatography/mass spectrometry and their components were identified. For three of the four species, P. alba, P. balsam ifera and P. nigra, the bud and leaf exudates were similar within each species, though there were marked differences between species. Bud and leaf exudates of P. alba contained only hydrocarbons, those of P. balsam ifera contained primarily dihydrochalcones and those of P. nigra contained primarily caffeic acid esters. Bud and leaf exudates of P. tremuloides were different both from each other and from …
Response Of Breeding Birds To Commercial Clearcutting Of Aspen In Southwestern Colorado [Usa], V.E. Scott, G.L. Crouch
Response Of Breeding Birds To Commercial Clearcutting Of Aspen In Southwestern Colorado [Usa], V.E. Scott, G.L. Crouch
Aspen Bibliography
Breeding birds on an aspen forest in southwestern Colorado increased in species diversity after 25% of the timber sale area forest was clearcut in patches of 3 to 20 acres. Bird population density on the forest with clearcuts was not significantly different from that on an uncut forest. Of the 20 species evaluated, six were more and one was less abundant than on the uncut forest.
Vertical Migration Of Onychiurus Subtenuis (Collembola) In Relation To Rainfall And Microbial Activity, M. Hassall, S. Visser, D. Parkinson
Vertical Migration Of Onychiurus Subtenuis (Collembola) In Relation To Rainfall And Microbial Activity, M. Hassall, S. Visser, D. Parkinson
Aspen Bibliography
No abstract provided.
Fire Effects In Northeastern Forests: Aspen, C. Rouse
Fire Effects In Northeastern Forests: Aspen, C. Rouse
Aspen Bibliography
No abstract provided.
Ruffed Grouse Habitat Relationships In Aspen And Oak Forests Of Central Wisconsin Usa, J.F. Kubisiak
Ruffed Grouse Habitat Relationships In Aspen And Oak Forests Of Central Wisconsin Usa, J.F. Kubisiak
Aspen Bibliography
Ruffed grouse habitat requirements and management opportunities have been defined by Bump et al. (1947), Grange (1948), Dorney (1959), Gullion at al. (1962), Moulton (1968), and Gullion (1972), among others. It is generally agreed that interspersion of cover types and age classes is one of the keys to better grouse populations.
Predicting Soil Moisture Depletion Beneath Trembling Aspen, D. Mital, E. Sucoff
Predicting Soil Moisture Depletion Beneath Trembling Aspen, D. Mital, E. Sucoff
Aspen Bibliography
No abstract provided.
An Indirect Method To Estimate The Aerial Biomass Of Small Single Stemmed Woody Plants, R.D. Fitzgerald
An Indirect Method To Estimate The Aerial Biomass Of Small Single Stemmed Woody Plants, R.D. Fitzgerald
Aspen Bibliography
No abstract provided.
Decomposition Rates Of Aspen Bole And Branch Litter, W.E. Miller
Decomposition Rates Of Aspen Bole And Branch Litter, W.E. Miller
Aspen Bibliography
No abstract provided.
The Utilization Of Carbohydrates In Aspen Roots Following Partial Or Complete Top Removal, R.D. Fitzgerald, J. Hoddinott
The Utilization Of Carbohydrates In Aspen Roots Following Partial Or Complete Top Removal, R.D. Fitzgerald, J. Hoddinott
Aspen Bibliography
No abstract provided.
Natural Variation In Merchantable Stem Biomass And Volume Among Clones Of Populus Tremuloides Michx, G.A. Lehn, K.O. Higginbotham
Natural Variation In Merchantable Stem Biomass And Volume Among Clones Of Populus Tremuloides Michx, G.A. Lehn, K.O. Higginbotham
Aspen Bibliography
No abstract provided.
Ecotypic Differences In Heat Resistance Of Aspen Leaves, K.M. Peck, S.J. Wallner
Ecotypic Differences In Heat Resistance Of Aspen Leaves, K.M. Peck, S.J. Wallner
Aspen Bibliography
Heat resistance of aspen (Populus tremuloides) leaves was assessed by stressing leaf discs in vitro and measuring electrolyte leakage. Leaves were obtained from trees growing at elevations of 1960, 2195, and 2454 m. Heat tolerance was greatest in leaf samples from trees growing at the lowest site. Trees propagated from these sites and grown at 1520 m for 2 years showed some increase in heat tolerance, but apparent ecotypic differences persisted
Effect Of Container Size And Harvest Date On The Growth Of Quaking Aspen Populus-Tremuloides Seedlings, L. A. Erhard, J. T. Fisher
Effect Of Container Size And Harvest Date On The Growth Of Quaking Aspen Populus-Tremuloides Seedlings, L. A. Erhard, J. T. Fisher
Aspen Bibliography
Quaking Aspen (Populus tremuloides Michaux) were
greenhouse grown in four sizes of paraffin-coated containers: 185 cubic centimeters (11 cubic inches), 492 cubic centimeters (30 cubic inches), 1132 cubic centimeters (68 cubic inches), and 1472 cubic centimeters (90cubic inches).
Fire Behaviour In Aspen Slash Fuels As Related To The Canadian Fire Weather Index, M.E. Alexander
Fire Behaviour In Aspen Slash Fuels As Related To The Canadian Fire Weather Index, M.E. Alexander
Aspen Bibliography
The characteristics and short-term results of experimental prescribed fires in 2-year-old trembling aspen (Populus tremuloides Michx.) logging slash in northern Minnesota have been described by D. A. Perala (1974. Can. J. For. Res. 4: 222-228). The associated burning conditions are expressed here in terms of the weather-dependent numerical fuel moisture codes and fire behavior indexes of the Canadian system of forest fire danger rating.
An Approach To Functionalizing Key Environmental Factors Forage Production In Rocky Mountain Aspen Populus-Tremuloides Stands, J.P. Roise, D.R. Betters, B.M. Kent
An Approach To Functionalizing Key Environmental Factors Forage Production In Rocky Mountain Aspen Populus-Tremuloides Stands, J.P. Roise, D.R. Betters, B.M. Kent
Aspen Bibliography
No abstract provided.
Aspen Resource Of Minnesota Usa, P.J. Jakes
Improving Aspen Poplar Populus-Tremuloides And Prickly Rose Rosa-Acicularis Covered Rangeland With Herbicides And Fertilizer, G. Bowes
Aspen Bibliography
No abstract provided.
An Examination Of The Leaf Quaking Adaptation And Stomatal Distribution In Populus-Tremuloides, J.W. Rushin, J.E. Anderson
An Examination Of The Leaf Quaking Adaptation And Stomatal Distribution In Populus-Tremuloides, J.W. Rushin, J.E. Anderson
Aspen Bibliography
The leaves of quaking aspen (Populus tremuloides Michx.) have a flattened petiole that allows them to quake (oscillate and roll) under low wind velocities. It was hypothesized that this adaptation might enable the plant to respond to windy conditions that would increase transpirational losses. No effects of wind with or without leaf quaking on stomatal resistance were observed under controlled conditions in the field. If wind and leaf quaking affect stomatal resistance, such effects must be small in comparison to those caused by other factors such as leaf water potential and ambient humidity.
Aspen leaves are hypostomatal with stomata …
Biomass And Production Of An Aspen-Mixed Hardwood-Spodosol Ecosystem In Northern Wisconsin, John Pastor, J.G. Bockheim
Biomass And Production Of An Aspen-Mixed Hardwood-Spodosol Ecosystem In Northern Wisconsin, John Pastor, J.G. Bockheim
Aspen Bibliography
No abstract provided.
Cryptosphaeria Canker And Libertella Decay Of Aspen, Thomas E. Hinds
Cryptosphaeria Canker And Libertella Decay Of Aspen, Thomas E. Hinds
Aspen Bibliography
A recently discovered, widely distributed canker disease of aspen and other poplars throughout the Rocky Mountain region is described. Inoculations with ascospore and conidial isolates of Cryptosphaeria populina show the fungus is capable of causing branch, sprout, and sapling mortality, trunk cankers, and the discoloration and decay of aspen stems previously associated with its imperfect stage, Libertella sp. The greatest average canker elongation 50 mo after September inoculations was 33.5 cm with sapwood decay and discoloration extending to 401 cm. The fungus caused an average weight loss of 13.5% in bark, 27.0% in sapwood, and 19.1% in heartwood blocks. Incidence …
Utilization Of Aspen Populus-Tremuloides Trees As A Ruminant Feed Component, M. Singh, L.D. Kamstra
Utilization Of Aspen Populus-Tremuloides Trees As A Ruminant Feed Component, M. Singh, L.D. Kamstra
Aspen Bibliography
When traditional roughages are in short supply or high in price, other fibrous feed sources for ruminants should be considered if available at a competitive price. One such fibrous material shown to have potential as a ruminant feed is the aspen tree (Populus tremuloides Michx.) harvested in its entire form to include bark, leaves and trunk. The aspen tree is the most widespread tree species in North America and the least utilized. Estimates exceed 6 million acres of mature trees in an area which would include the Black Hills (58,000 acres), the Great Lakes region and the Rocky …
Effects Of Storage Temperature And Moisture Stress On Seed Germination And Early Seedling Development Of Trembling Aspen Populus-Tremuloides, G.H. Fechner, K.E. Burr, J.F. Myers
Effects Of Storage Temperature And Moisture Stress On Seed Germination And Early Seedling Development Of Trembling Aspen Populus-Tremuloides, G.H. Fechner, K.E. Burr, J.F. Myers
Aspen Bibliography
No abstract provided.
Allelochemic Interference By Quaking Aspen Leaf Litter On Selected Herbaceous Species, P.D. Younger, R.G. Koch, L.A. Kapustka
Allelochemic Interference By Quaking Aspen Leaf Litter On Selected Herbaceous Species, P.D. Younger, R.G. Koch, L.A. Kapustka
Aspen Bibliography
No abstract provided.
Fire Temperatures In Grass, Shrub And Aspen Forest Communities Of Central Alberta, A.W. Bailey, M.L. Anderson
Fire Temperatures In Grass, Shrub And Aspen Forest Communities Of Central Alberta, A.W. Bailey, M.L. Anderson
Aspen Bibliography
No abstract provided.
The Forest Vegetation At Higher Altitudes In The Chiricahua Mountains Arizona Usa, D.A. Sawyer, T.B. Kinraide
The Forest Vegetation At Higher Altitudes In The Chiricahua Mountains Arizona Usa, D.A. Sawyer, T.B. Kinraide
Aspen Bibliography
No abstract provided.
Effects Of Fertilization On Hypoxylon Canker Of Trembling Aspen, G.E. Teachman, D.J. Frederick, W.E. Perkis, M.F. Jurgensen
Effects Of Fertilization On Hypoxylon Canker Of Trembling Aspen, G.E. Teachman, D.J. Frederick, W.E. Perkis, M.F. Jurgensen
Aspen Bibliography
No abstract provided.
Observations On The Ecology And Evolution Of Quaking Aspen, Populus Tremuloides, In The Colorado Front Range, Jeffry B. Mitton, Michael C. Grant
Observations On The Ecology And Evolution Of Quaking Aspen, Populus Tremuloides, In The Colorado Front Range, Jeffry B. Mitton, Michael C. Grant
Aspen Bibliography
No abstract provided.