Treesearch

An estimated 466 million ft 3 of forest residue material (nonmerchantable, 3 inches diameter and larger) is generated annually in the Northern Rocky Mountains (Montana, Idaho, Wyoming). Extensive studies of residues in the major forest types show a considerable portion is suited for various products. The lodgepole pine type has the greatest potential for increased residue utilization. In most other forest types, form and condition of residues limit potential use to fiber or fuel. In all forest types, volume, condition, and product potential vary widely from stand to stand.

Larch-fir stands in northwest Montana were experimentally logged to determine the influence of increasingly intensive levels of utilization upon rates of yarding production, under three different silvicultural prescriptions. Variables influencing rate of production were also identified.

This map illustrates, at a scale of 1:1,000,000, the major upland biotic communities (=biomes) of the "American Southwest". We consider the natural Southwest region that area shared between the U.S. and adjacent Mexico from longitudes 103° to 118° and from latitude 37° 31' to latitude 27°, including all or parts of the states of Arizona, New Mexico, Texas, Colorado, Utah, Nevada, and California and all or part of Baja California, Sonora, Chihuahua, and Coahuila. The 27 biotic communities identified are those presented in the hierarchical ecosystem classification developed by Brown and Lowe...

Provides information on fire as an ecological factor for Lolo National Forest habitat types. Identifies "Fire Groups" of habitat types based on fire's role in forest succession. Describes forest fuels and suggests considerations for fire management.

This paper discusses some on-site erosion and stream sedimentation consequences of forest road construction in small watersheds in northern Idaho. Pioneering and culvert installation increase sediment fluxes in the streams, just below the road, 100 to 10,000 times the normal daily flux for short periods of time. Subsequent to construction, rain and snowmelt events acting on the road prism features appreciably increase sediment fluxes in the streams just below the roads. Sediment measurements at the mouths of these small watersheds indicate that very little of the road derived sediment is...

The life cycle and production of Skwala parallela, a perlodid stonefly, was investigated in a third-order Colorado montane stream. The species exhibited a univoltine life cycle with a distinct cohort. Small nymphs appeared in May. Rapid growth was exhibited throughout summer and autumn. During winter, growth slowed somewhat but was continuous until April. Maximum density of 34 nymphs/m2 occurred in July. Based upon the instantaneous growth method, annual production was 395 .3 mg/m2 or 3 .95 kg/ ha dry weight with a P/B ratio of 4.4.

Please note: The information in Research Note INT-287 is obsolete. The latest information developed by Station scientists on this topic is contained in: Reinhardt, Elizabeth D.; Ryan, Kevin C. 1988. How to estimate tree mortality resulting from underburning. Fire Management Notes. 49(4): 30-36.A dichotomous event regression model is used to estimate survival of fire-injured interior Douglas-fir (Pseudotsuga menziesii var. glauca) 1 year after burning. A preliminary salvage marking guide is presented based upon stem diameter at breast height and crown scorch height.

A bird census method is presented that is designed for tall, structurally complex vegetation types, and rugged terrain. With this method the observer counts all birds seen or heard around a station, and estimates the horizontal distance from the station to each bird. Count periods at stations vary according to the avian community and structural complexity of the vegetation. The density of each species is determined by inspecting a histogram of the number of individuals per unit area in concentric bands of predetermined widths about the stations, choosing the band (with outside radius where...

Potential production of Engelmann spruce and subalpine fir in the central Rocky Mountains is simulated for vario.us combinations of stand density, site quality, ages, and thinning schedules. Such estimates are needed to project future development of stands managed in different ways for various uses.

Presents a summary and analysis of data from a survey of visitors to eight wildernesses and related areas in the Montana and Idaho Rockies and to one wilderness in the California Sierra Nevadas. Basic data on use patterns, including types of groups, activities, travel behavior, visitor characteristics, motives for visits, satisfaction with conditions experienced, and preferences for management actions are described and compared among areas, between day-users and campers, horsemen and hikers, and summer and fall visitors. Management implications are discussed.