Treesearch

In western South Dakota, native deciduous woodlands are uncommon, constituting less than 1% of the total land area (Boldt et al. 1978). The Green Ash/Common Chokecherry (Fraxinus pennsylvanica/Prunus virginiana) habitat type is the major deciduous habitat type in northwestern South Dakota (Hansen and Hoffman 1985). This type occurs in depressions, draws, and along streams where favorable moisture conditions prevail. In many areas, Green Ash woodlands are in serious decline (Boldt et al. 1978). Stands in late stages of decline (referred to as open-canopy stands) are characterized by sparse...

Vegetation, small rodents, and birds were sampled during the growing seasons of 2 years on prairie dog (Cynomys ludovicianus) colonies and adjacent mixed-grass prairie in western South Dakota. Prairie dog grazing decreased mulch cover, maximum height of vegetation, plant species richness, and tended to decrease live plant canopy cover compared to that on ungrazed mixed-grass prairie. Buffalograss (Buchloe dactyloides) was the dominant plant on prairie dog towns and western wheatgrass (Agropyron smithii and blue grama (Bouteloua gracilis) were most common on mixed-grass prairie sites....

Describes BURN Subsystem, Part 1, the operational fire behavior prediction subsystem of the BEHAVE fire behavior prediction and fuel modeling system. The manual covers operation of the computer program, assumptions of the mathematical models used in the calculations, and application of the predictions.

Provides information on use of prescribed fire to enhance productivity of bunchgrass ranges that have been invaded by Douglas-fir. Six vegetative "situations" representative of treatment opportunities most commonly encountered in Montana are discussed. Included are fire prescription considerations and identification of the resource objective, fire objective, kind of fire needed, and fuels.

An extinction index is developed to describe the marginal burning state of free burning surface fires in porous beds of woody fuels. The index depends on the fuel surface area, fuel moisture content, endothermic heat of pyrolysis, and the heat of combustion of the pyrolyzate gases. Extinction and marginal burning state probability distribution functions are fitted to data from 470 test fires.

A wilderness management-by-objectives planning system is outlined. Through identification of standards, acceptable wilderness conditions are defined and appropriate management actions formulated. A case example is provided.

Provides information on fire management policy, programs, and issues in parks, wildernesses, and other natural areas. In more than 100 papers, poster papers, and workshop summaries, both researchers and managers explore basic wilderness management philosophies, explain current wilderness, natural area, and fire management objectives, describe current natural fire programs, identify and discuss current fire management issues, present fire management planning considerations, describe operational techniques for park and wilderness fire management, and present results of current research...

Habitat types, community types and plant communities in the Rocky Mountains in which interior Pinus ponderosa, interior Pseudotsuga menziesii, interior Abies concolor, Picea pungens, Populus tremuloides, Pinus contorta, Picea engelmannii, and Abies lasiocarpa occur are tabulated. Included are the name, location, site, successional status, principal tree and understory associates, and the authority.

Old-growth spruce-fir stands on the Fraser Experimental Forest, Colorado, were found to be irregularly uneven-aged. Although subalpine fir trees were most numerous, most of the basal area was Engelmann spruce. Alternatives to current cutting methods are suggested for stands with similar structures.

Presents highlights of the forest resources of Montana as of 1980. Describes the forest resources, their extent, condition, and location, and discusses levels of some nontimber use of forest lands. Includes statistical tables: area by land -classes, ownership, growing stock and sawtimber volumes, growth, mortality, roundwood products output, utilization, and residues.