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Articles 1 - 17 of 17
Full-Text Articles in Life Sciences
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.
Vertical Migration Of Onychiurus Subtensis (Collembola) In Relation To Rainfall And Microbial Activity, M. Hassall, S. Visser, D. Parkinson
Vertical Migration Of Onychiurus Subtensis (Collembola) In Relation To Rainfall And Microbial Activity, M. Hassall, S. Visser, D. Parkinson
Aspen Bibliography
Changes in the vertical distribution of the Collembolan Onychiurus subtenuis were observed in the litter layers of a Populus tremuloides woodland in Alberta, Canada during summer and autumn. Field studies showed that the Collembola moved down into the deeper horizons of the litter profile during the dry summer months but that a significant proportion of the population returned to the surface litter layers within a few hours after summer rain storms and remained to feed there until the litter dried out again.
Leaf Morphology Plasticity In Response To Light Environment In Deciduous Tree Species And Its Implication On Forest Succession, F. Goulet, P. Bellefleur
Leaf Morphology Plasticity In Response To Light Environment In Deciduous Tree Species And Its Implication On Forest Succession, F. Goulet, P. Bellefleur
Aspen Bibliography
Sun leaves of five deciduous tree species were shaded, while shade leaves of the same species were exposed to direct rays of the sun prior to budbreak and during leaf expansion. Thickness, area, and density thickness (fresh weight per unit area) were measured and compared with sun and shade leaves that were used as a control. These parameters showed a considerable differentiation in leaf structure both for the control and treated leaves, particularly with very tolerant (American beech and sugar maple) and intermediate (yellow birch) species; this was apparently associated with the prevailing light conditions around a particular leaf from …
Aspen Regeneration In 6- To 10-Year-Old Clearcuts In Southwestern Colorado, Glenn L. Crouch
Aspen Regeneration In 6- To 10-Year-Old Clearcuts In Southwestern Colorado, Glenn L. Crouch
Aspen Bibliography
No abstract provided.
Relationships Among Aspen, Fungi, And Ungulate Browsing In Colorado And Wyoming, John H. Hart
Relationships Among Aspen, Fungi, And Ungulate Browsing In Colorado And Wyoming, John H. Hart
Aspen Bibliography
No abstract provided.
Factors Affecting Anion Movement And Retention In Four Forest Soils, D. W. Johnson, D. W. Cole, H. Van Miegroet, F. W. Horng
Factors Affecting Anion Movement And Retention In Four Forest Soils, D. W. Johnson, D. W. Cole, H. Van Miegroet, F. W. Horng
Watershed Sciences Faculty Publications
Three hypotheses concerning the movement and retention of anions in forest soils were tested in a series of laboratory and field studies on two Tennessee Ultisols with mixed deciduous forest cover and two Washington Inceptisols, one with deciduous (red alder Alnus rubra Bong.) and one with coniferous [Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco] forest cover. The first hypothesis, that sulfate and phosphate retention was related to adsorption to free Fe and Al oxides, which were in turn related to soil parent material and degree of weathering, was not supported by results of laboratory and field studies. The young, relatively unweathered Washington …
Aspnorm: A Normal Diameter Distribution Growth And Yield Model For Aspen In The Central Rocky Mountains, H.T. Mowrer
Aspnorm: A Normal Diameter Distribution Growth And Yield Model For Aspen In The Central Rocky Mountains, H.T. Mowrer
Aspen Bibliography
Development of a normal diameter distribution growth and yield model for pure, even-aged, unthinned clones of aspen in the central Rocky Mountains is described, including testing for normality of diameter distributions, development of regression estimators for stand parameters, model validation, and model application.
Mountain Pine Beetle Outbreaks In The Rocky Mountains: Effects On Fuels And Fire In Lodgepole Pine Forest (Abstract), W H. Romme, D H. Knight, J Fedders
Mountain Pine Beetle Outbreaks In The Rocky Mountains: Effects On Fuels And Fire In Lodgepole Pine Forest (Abstract), W H. Romme, D H. Knight, J Fedders
The Bark Beetles, Fuels, and Fire Bibliography
Changes in fuels were studied in northwestern Wyoming by sampling a sequence of ten stands that had been heavily damaged by beetles from 1 to 20 years earlier. Leaf litter increased only slightly (3-6%) for six years, and large woody fuels (which contribute much less to flammability) increased steadily and substantially (up to 16 x) for at least 20 years. Other fuel categories did not change significantly. While flammability may be increased during the first year or two after a beetle infestation because dead leaves are still on the trees, the risk of destructive fire during years 2-20 may be …
Mountain Pine Beetle Outbreaks In The Rocky Mountains: Regulators Of Primary Productivity?, W. H. Romme, D. H. Knight, J. B. Yavitt
Mountain Pine Beetle Outbreaks In The Rocky Mountains: Regulators Of Primary Productivity?, W. H. Romme, D. H. Knight, J. B. Yavitt
The Bark Beetles, Fuels, and Fire Bibliography
We consider the hypothesis that mountain pine beetles function as cybernetic regulators of primary productivity in ecosystems of lodgepole pine forest through their selective killing of dominant trees and the subsequent redistribution of resources. Following a recent major beetle outbreak in Yellowstone and Grand Teton national parks, surviving trees did grow significantly faster (P < .1); wood production was redistributed among canopy, subcanopy, and understory trees; and annual wood production per hectare usually returned to pre-attack levels or exceeded them within 10-15 yr. However, reconstructions of annual wood production over the last 70-80 yr indicate that the beetle outbreak did not reduce the variation in productivity; rather, the beetles introduced more variation than would have existed in their absence. Hence, our results do not support the hypothesis that the beetles function as cybernetic regulators (in the strict sense). Nevertheless, the beetle-pine system that we studied shows great resilience, and the effects of beetles on primary productivity do not appear to be as severe as conventional wisdom maintains. Annual wood production per hectare returned quickly to previous levels in the stands we studied, and associated ecological changes can be considered generally benign or even beneficial.
Greenhouse Production Of Quaking Aspen Seedlings, K.E. Burr
Greenhouse Production Of Quaking Aspen Seedlings, K.E. Burr
Aspen Bibliography
No abstract provided.
Aspen Community Types Of Utah, Walter F. Mueggler, R.B. Campbell
Aspen Community Types Of Utah, Walter F. Mueggler, R.B. Campbell
Aspen Bibliography
No abstract provided.
Silviculture Of Aspen In The Central Rocky Mountains And Southwest, Wayne D. Shepperd
Silviculture Of Aspen In The Central Rocky Mountains And Southwest, Wayne D. Shepperd
Aspen Bibliography
No abstract provided.
Aspen Community Types Of Utah, U.S. Forest Service
Aspen Community Types Of Utah, U.S. Forest Service
All U.S. Government Documents (Utah Regional Depository)
A vegetation classification for the Aspen dominated forests of Utah is based upon existing community structure and plant species composition.
Appraising Fuels And Flammability In Western Aspen: A Prescribed Fire Guide, J.K. Brown, D.G. Simmerman
Appraising Fuels And Flammability In Western Aspen: A Prescribed Fire Guide, J.K. Brown, D.G. Simmerman
Aspen Bibliography
Describes a method for appraising fuels and fire behavior potential in aspen forests to guide the use of prescribed fire and preparation of fire prescriptions. Includes an illustrated classification of aspen fuels; appraisals of fireline intensity, rate of spread, adjective ratings for fire behavior and probability of burn success; and evaluations of seasonal change in live fuel moisture contents.
Streamline Herbicide Release Of Red Pine (Pinus Resinosa), L.S. Brooks, B.S. Jones
Streamline Herbicide Release Of Red Pine (Pinus Resinosa), L.S. Brooks, B.S. Jones
Aspen Bibliography
Conifer management in the lake States requires the land manager have a diverse set of tools to accomplish the task of plantation establishment and survival. Methods are almost as variable as the soils of the region, which as remnants of ancient seas, volcanos and more recent glaciers. Terrain, soil profile, drainage, aspect and climate are some of the basic factors contributing to the diversity of sites and management regimes practices in the region. Herbicides are an important part of successful conifer management regimes. Approximately 70M forested acres are treated annually in MN, WI and the Upper Peninsula of MI.
Fire Effects In Northeastern Forests: Aspen, C. Rouse
Fire Effects In Northeastern Forests: Aspen, C. Rouse
Aspen Bibliography
No abstract provided.
Impact Of Aspen Management On Rocky Mountain Wildlife, Gordon W. Gullion
Impact Of Aspen Management On Rocky Mountain Wildlife, Gordon W. Gullion
Aspen Bibliography
No abstract provided.