Treesearch

Historic Charleston, South Carolina was the site of the 1979 Silviculture Workshop. The objective of the meeting was to discuss state of the art application of the shelterwood regeneration method to forests of the United States. These proceedings include the presentations of the individuals on the program.

In this paper, Montana is divided into eight geographic subdivisions called "forest regions," based on distributions of tree and undergrowth species and the relationship of these patterns to climate and topography. The regions serve as a geographic reference for describing patterns of forest vegetation across the State. Data on the distributions of plant species and habitat types and forest zonation are presented for each region.

A review, with literature citations, of current remote sensing technology, applications, and costs for wildland resource management, including collection, interpretation, and processing of data gathered through photographic and nonphotographic techniques for classification and mapping, interpretive information for specific applications, measurement of resource parameters, and observations and counts of occurrences.

A carefully designed 6-year study showed cows and calves gained the same amount of weight, whether they grazed pastures seasonlong or under a rotation management system. A complex cross-over statistical design minimized variation from changes in vegetation or differences in range improvements. These results, along with results from earlier studies on effects of livestock management on rates of range recovery, indicate that complex rotation-grazing systems are of questionable value on ponderosa pine-bunchgrass ranges in Colorado.

Measurements of soil surface elevation on ponderosa pine-bunch lands In central Colorado showed 35 years of grazing and winter logging had not caused serious erosion. All measurements indicated an aggradation of soil surface material In relation to differences in ground cover, grazing, and timber removal. Aggradation on ungrazed areas exceeded aggradatlon on grazed or logged areas by less than 7 millimeters.

The purpose of this study was to quantify the impact and evaluate the local and immediate downstream pollution potential of range cattle grazing with free stream access. Emphasis was placed on suspended solids, ammonia-nitrogen, nitrate-nitrogen, orthophosphate, fecal coliform and fecal streptococci concentrations. Samples were collected at four sites along a 2.6 km section of Trout Creek, the only perennial stream within the Manitou Experimental Forest. The study was broken down into eight periods covering the two year period 1977-1978; two included 150 cows in the lower pasture, two...

The number of streams regulated by dams is increasing more rapidly than our understanding of the ecological consequences. Studies of regulated streams in Colorado show that macroinvertebrate communities may be useful indicators of ecological conditions because they integrate the unique combination of physical and chemical variables below each dam. A fuller understanding of why certain taxa are affected in a given way would contribute not only to knowledge of ecological requirements of species, but ultimately would provide data of predictive value in assessing impacts and desirable modificat...

Lightning is the leading cause of fires in southwestern forests. On all protected private, state and federal lands in Arizona and New Mexico, nearly 80 percent of the forest, brush and range fires are ignited by lightning. The Southwestern region leads all other regions of the United States both in total number of lightning fires and in the area burned by these fires.

Relationships between live and dead crown weight and d. b. h. (ranging from 0 to 40 inches), crown length, tree height, and crown ratio are presented for 11 conifer species in the Rocky Mountains.

An experimental logging road designed to minimize environmental and esthetic impact was constructed in northwest Montana. The road was single-lane (14-foot finished surface, 3-foot ditch), constructed along the contour. Esthetically, the single-lane experimental road was judged far superior to existing roads on the forest.