Treesearch

Two series of color photographs show different levels of downed woody material resulting from natural processes in two forest cover types in Montana. Each photo is supplemented by fuel inventory data and potential fire· behavior ratings.

Planted Englemann spruce seedlings from 20 sources throughout North America were field tested in the central Rockies at 9,600 feet (2,930 m) elevation. Overall survival was 73% after 10 years. Significant differences in height were evident among several sources. Sources from northern latitudes and lower elevations grew best. The results demonstrate that Englemann spruce planted at high elevations can survive when proper planting techniques and yearly maintenance procedures are used.

Predation by snakes has been implicated as a major cause of high nesting mortality in many passerine birds (e.g., Willis 1972, Best 1978, Nolan 1978), but predation is rarely observed (e.g., Snow 1962, Lill 1974). Snakes and other predators typically consume the entire contents of a nest during one visit (e.g., Nolan 1978). Nestling starvation caused by sibling competition for food is frequently invoked to explain partial loss of broods (e.g., Ricklefs 1965, Howe 1978). While conducting a study of Abert's Towhees (Pipilo aberti) in the lower Colorado River valley 9.7 km north of Ehrenberg,...

This year's National Silviculture Workshop was held in Roanoke, Virginia and the Monongahela National Forest. The purpose of the meetings were to discuss current silvicultural issues affecting all Regions and to review in detail the state-of-the-art application of hardwood management in the United States. These proceedings include the presentations of individuals on the program.

Natural ponderosa pine fuels can be safely burned with air temperatures between 55° and 75°

Four series of color photographs show different levels of downed woody material resulting from natural processes in four forest cover types in Montana. Each photo is supplemented by fuel inventory data and potential fire behavior ratings.

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.