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Articles 1 - 17 of 17
Full-Text Articles in Forest Sciences
Forest Development And Carbon Dynamics After Mountain Pine Beetle Outbreaks, E. Matthew Hansen
Forest Development And Carbon Dynamics After Mountain Pine Beetle Outbreaks, E. Matthew Hansen
The Bark Beetles, Fuels, and Fire Bibliography
Mountain pine beetles periodically infest pine forests in western North America, killing many or most overstory pine stems. The surviving secondary stand structure, along with recruited seedlings, will form the future canopy. Thus, even-aged pine stands become multiaged and multistoried. The species composition of affected stands will depend on the presence of nonpines and outbreak severity, among other factors, and can range from continued dominance by pines to hastened conversion to more shade-tolerant species. The loss of mature host trees results in reductions of ecosystem carbon productivity. The surviving and recruited stems, however, grow more quickly in response to the …
Utah Forest Health Report : A Baseline Assessment 1999 - 2001, Colleen Keyes, Paul Rogers, Leon Lamadeleine, Vick Applegate, Dave Atkins
Utah Forest Health Report : A Baseline Assessment 1999 - 2001, Colleen Keyes, Paul Rogers, Leon Lamadeleine, Vick Applegate, Dave Atkins
The Bark Beetles, Fuels, and Fire Bibliography
This report addresses forest health in two ways: by discussion of forest-related issues and by data summaries in several appendices. FHM is a long-term monitoring program and therefore, the data presented in this report must be viewed in that light. This report presents a first-time, or baseline summary. Subsequent reports will address changes over time as plots and other detection surveys are conducted and re-measured.
Climate Change And Forest Disturbances, V. H. Dale, L. A. Joyce, S. Mcnulty, R. P. Neilson, M. P. Ayres, M. D. Flannigan, P. J. Hanson, L. C. Irland, A. E. Lugo, C. J. Peterson, D. Simberloff, F. J. Swanson, B. J. Stocks, B. M. Wotton
Climate Change And Forest Disturbances, V. H. Dale, L. A. Joyce, S. Mcnulty, R. P. Neilson, M. P. Ayres, M. D. Flannigan, P. J. Hanson, L. C. Irland, A. E. Lugo, C. J. Peterson, D. Simberloff, F. J. Swanson, B. J. Stocks, B. M. Wotton
The Bark Beetles, Fuels, and Fire Bibliography
No abstract provided.
Douglas-Fir Beetle, Richard F. Schmitz, Kenneth E. Gibson
Douglas-Fir Beetle, Richard F. Schmitz, Kenneth E. Gibson
The Bark Beetles, Fuels, and Fire Bibliography
The Douglas-fir beetle (Dendroctonus pseudotsuqae Hopk.) infests and kills Douglas-fir throughout most of its range in western United States British Columbia and Mexico. Occasionally western larch trees are infested when growing among Douglas-fir under attack. Attacks in standing larch are always unsuccessful, while those in freshly felled larch are usually successful and brood emergence is equivalent to that in Douglas-fir. Douglas-fir beetles normally kill small groups of trees, but during outbreaks 100 tree groups are not uncommon (fig. 1). Losses can be devastating during periodic outbreaks, such as four that occurred in western Oregon and Washington from 1950 through 1969, …
Douglas-Fir Beetle (Dendroctonus Pseudotsugae Hopkins, Coleoptera : Scolytidae) Brood Production On Douglas-Fir Defoliated By Western Spruce Budworm (Choristoneura Occidentalis Freeman, Lepidoptera : Tortricidae) In Logan Canyon, Utah, S E. Fredricks, M J. Jenkins
Douglas-Fir Beetle (Dendroctonus Pseudotsugae Hopkins, Coleoptera : Scolytidae) Brood Production On Douglas-Fir Defoliated By Western Spruce Budworm (Choristoneura Occidentalis Freeman, Lepidoptera : Tortricidae) In Logan Canyon, Utah, S E. Fredricks, M J. Jenkins
The Bark Beetles, Fuels, and Fire Bibliography
Douglas-fir beetle brood production was studied on Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) trees defoliated by the western spruce budworm between 1983 and 1985. Tallies were made of the number of attacks, total length and number of egg galleries, number of eggs deposited, number of larval tunnels, number of pupal chambers, and number of emerging beetles (per female and per unit area). Data analysis showed no significant differences among the three years studied. The number of emerging beetles per female parent was 0.59, and emergence per 90 cm2 was 2.32 beetles. Egg, larval, and pupal survivals were 47.5%, 30.0%, and 15.5%, …
Lodgepole Pine Vigor, Regeneration, And Infestation By Mountain Pine Beetle Following Partial Cutting On The Shoshone National Forest, Wyoming, Gene D. Amman, Gene D. Lessard, Lynn A. Rasmussen, Curtis G. O'Neil
Lodgepole Pine Vigor, Regeneration, And Infestation By Mountain Pine Beetle Following Partial Cutting On The Shoshone National Forest, Wyoming, Gene D. Amman, Gene D. Lessard, Lynn A. Rasmussen, Curtis G. O'Neil
The Bark Beetles, Fuels, and Fire Bibliography
Lodgepole pine stands were thinned in the Shoshone National Forest of northwestern Wyoming in 1979 and 1980 using different forms of partial cutting. Average losses of trees 5 inches diameter at breast height and larger to mountain pine beetles during the 5 years following thinning ranged from less than 1 percent in spaced thinnings to 7.4 percent in the 12-inch diameter limit cut, compared to 26.5 percent in check stands. Residual trees increased radial growth significantly, but change in growth efficiency is slow. Regeneration 5 years after thinning ranged between 1,160 and 3,560 seedlings per acre, with pine being favored …
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.
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 …
Coniferous Forest Habitat Types Of Northern Utah, Ronald L. Mauk, Jan A. Henderson
Coniferous Forest Habitat Types Of Northern Utah, Ronald L. Mauk, Jan A. Henderson
The Bark Beetles, Fuels, and Fire Bibliography
Data from >1100 plots in coniferous forests of northern Utah and adjacent areas of Idaho and Wyoming were used to identify 8 climax series and 36 habitat types. Descriptions are given of each type with notes on potential productivity for timber and characteristics of site, climate and surface soil.
Forest Fuel Accumulation -- A Growing Problem, Marvin Dodge
Forest Fuel Accumulation -- A Growing Problem, Marvin Dodge
The Bark Beetles, Fuels, and Fire Bibliography
Discusses the problem caused by accumulation of forest fuels in the wild-land forests of the western USA under the policy of total fire protection pursued there for many years, and emphasizes the need to find economical and practical ways of reducing fuel hazards in these forests, especially by means of prescribed burning under conditions in which low-intensity fires can be achieved.
Fire Weather : A Guide For Application Of Meteorological Information To Forest Fire Control Operations, Mark J. Schroeder, Charles C. Buck
Fire Weather : A Guide For Application Of Meteorological Information To Forest Fire Control Operations, Mark J. Schroeder, Charles C. Buck
The Bark Beetles, Fuels, and Fire Bibliography
Weather is never static. It is always dynamic. Its interpretation is an art. The art of applying complex information about weather to the equally complex task of wildland fire control cannot be acquired easily-especially not by the mere reading of a book. The environment is in control in wildland firefighting. Free-burning fires are literally nourished by weather elements, atmospheric components, and atmospheric motion. Outguessing mother nature in order to win control is an extremely difficult task. We need to soothe her with understanding. We have attempted to present information in such a way that your daily and seasonal awareness of …
Influence Of Logging On Douglas Fir Beetle Populations, R R. Lejeune, L H. Mcmullen, M D. Atkins
Influence Of Logging On Douglas Fir Beetle Populations, R R. Lejeune, L H. Mcmullen, M D. Atkins
The Bark Beetles, Fuels, and Fire Bibliography
All species of bark beetles of economic importance prefer to attack freshly-killed host material. Logging slash, wind-throw, and fire-killed timber provide ideal breeding grounds for bark beetles. A few species, mostly in the Dendroctonus group, are able to kill living trees. When beetles in the group, raised in preferred host material, cannot find any or enough freshly-killed trees, logs, or slash to enter, they may attack living trees. In the interior of British Columbia, infestations of the Douglas fir beetle can often be traced to logging disturbance.
The Effects Of Woodpeckers On Populations Of The Engelmann Spruce Beetle, F B. Knight
The Effects Of Woodpeckers On Populations Of The Engelmann Spruce Beetle, F B. Knight
The Bark Beetles, Fuels, and Fire Bibliography
Woodpeckers have been recognized for many years as a major factor in the natural reduction of Engelmann spruce beetle populations. A means of assessing their value has been developed. Five classifications of woodpecker feeding based on woodpecker work on 225 trees were studies. An analysis of populations measurements showed a correlation between beetle survival and the woodpecker classification and the intensity of infestation in each tree. A heavy woodpecker classification resulted n very little survival at all intensities of infestation. Survival increased both with an increase in intensity of infestation and a lower woodpecker classification. The average reduction in populations …
Forest Fires In The Northern Rocky Mountains, J S. Barrows
Forest Fires In The Northern Rocky Mountains, J S. Barrows
The Bark Beetles, Fuels, and Fire Bibliography
This is a report on an analysis of 36,000 forest fires in the northern Rocky Mountains. The analysis was made to gain a better understanding of the occurrence, behavior, control, and effects of fires, and in turn to obtain essential information required for improved planning and management of fire protection systems. The results present answers to these questions: 1) What is the magnitude of the regional fire problem? 2) What are the basic features of fire behavior under various topographic, fuel, and weather conditions? 3) What have been the results of organized fire control programs including fire prevention, detection, communication, …
Rate Of Deterioration Of Beetle-Killed Engelmann Spruce, James L. Mielke
Rate Of Deterioration Of Beetle-Killed Engelmann Spruce, James L. Mielke
The Bark Beetles, Fuels, and Fire Bibliography
Examination of beetle-killed stands in Utah and Colorado indicate that dead Engelmann Spruce will remain standing and sound for at least 20 years.
Forest Fire Damage Studies In The Northeast--I. Bark-Beetles And Fire Damaged Hardwoods, Paul W. Stickel
Forest Fire Damage Studies In The Northeast--I. Bark-Beetles And Fire Damaged Hardwoods, Paul W. Stickel
The Bark Beetles, Fuels, and Fire Bibliography
In reporting the damage to trees scorched lightly at the base by fire the average fire warden and even the technically trained forester is given to stating that little harm has been done providing the tree crowns remain green. Such a statement is far from being correct, failing as it does to take into account the aftermath of insect and fungus damage which invariably follows even the lightest of surface fires. In the case reported herein, over 50 per cent of the fire-scorched hardwoods showed signs of the presence of ambrosia-beetles, whose work, even if the trees continue to live, …
Practical Information On The Scolytid Beetles On North American Forests I. Barkbeetles Of The Genus Dendroctonus, Andrew Delmar Hopkins
Practical Information On The Scolytid Beetles On North American Forests I. Barkbeetles Of The Genus Dendroctonus, Andrew Delmar Hopkins
The Bark Beetles, Fuels, and Fire Bibliography
During the writer's investigations of extensive insect depredations in the forests of West Virginia, from 1890 to 1902, he was forcibly impressed with the importance of the forest-insect problem in connection with any future efforts toward the successful management of the forests of this country, and was thus led to give special attention to the subject. It was soon realized that among the principal groups of insect enemies of forest trees the scolytid bark and wood boring beetles must occupy first rank, both in economic importance and systematic interest. Subsequent investigations in West Virginia, in connection with the work of …