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Full-Text Articles in Physical Sciences and Mathematics
Low-Cost Harvesting Systems For Intensive Utilization In Small-Stem Lodgepole Pine Stands, United States Department Of Agriculture, Forest Service
Low-Cost Harvesting Systems For Intensive Utilization In Small-Stem Lodgepole Pine Stands, United States Department Of Agriculture, Forest Service
Forestry
The study reported here had two objectives: (1) examine the feasibility of using inexpensive skidding equipment in a small-stem lodgepole pine stand in western Montana, and (2) determine forest residues volumes (unused wood) resulting from different ground skidding methods and utilization standards. Preharvest volumes, volumes removed, residues left on the ground, and unusable material hauled from the site were determined for various utilization standards. The efficiency of skidding with a horse, small tractor, and small rubber-tired skidder were compared.
Genetic Variation In Susceptibility Of Western White Pine To Needle Blight, United States Department Of Agriculture, Forest Service
Genetic Variation In Susceptibility Of Western White Pine To Needle Blight, United States Department Of Agriculture, Forest Service
Forestry
Ten clones of western white pine differed in their susceptibility to white pine needle blight. Two clones were significantly less infected than the average and two clones were significantly more infected than the average. This variability suggests a simple inheritance, maybe just one or two genes.
Timelag And Equililbrium Moisture Content Of Ponderosa Pine Needles, United States Department Of Agriculture, Forest Service
Timelag And Equililbrium Moisture Content Of Ponderosa Pine Needles, United States Department Of Agriculture, Forest Service
Forestry
The ponderosa pine (Pinus ponderosa Laws.) timber type covers nearly 9 million acres in the Rocky Mountains. The needle litter cast by these trees produces a highly flammable fuel when conditions are dry. The capability for fires to start and spread depends largely on the moisture content of surface fuels and their response to environmental changes. This report summarizes the results of laboratory tests to determine equilibrium moisture contents and absorption-desorption timelags below fiber saturation of ponderosa pine needles. Conducting the tests at conditions below fiber saturation eliminated consideration of the movement of free water and possible leaching of the …