Treesearch

A land-classification system based upon potential natural vegetation is presented for the forests of central Idaho. It is based on reconnaissance sampling of about 800 stands. A hierarchical taxonomic classification of forest sites was developed using the habitat type concept. A total of eight climax series, 64 habitat types, and 55 additional phases of habitat types are defined and described. A diagnostic key is provided for field identification of the types based on indicator species used in development of the classification.

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.

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.

Slash burning in a clearcut under conditions producing very light to light burn intensities (

An over-mature Douglas-fir/western larch stand on the Coram Experimental Forest in Montana averaged about 7,300 ft3/acre (511 rn3/ha) of wood over 3 inches (7.62 cm) in diameter, and an additional 57 tons/acre (128/ha) of fine material, before harvest. After logging, using three different cutting methods and four different levels of utilization, wood residues ranged from 600 ft 3/acre (43 m3/ha) under intensive utilization to over 3,500 ft3/acre (245 m3/ha) where only saw logs were removed. Fine residues increased under all treatments.