Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 58 for “"timber harvesting"”.
-
Systems Dynamics Simulation To Improve Timber Harvesting System Management
… system assignment decisions. Four general harvesting systems: manual, mechanized, shovel and cut-to-length can be modeled to harvest timber, from standing trees to processed logs loaded on to trucks. Model testing showed that as terrain, tract and system characteristics changed, the …
-
Impacts of timber harvesting on soil physical properties in wetlands
Six wet pine flat sites were salvage logged following Hurricane Hugo in the fall of 1989. High soil moisture conditions during salvage operations resulted in soil compaction and deep rutting (puddling) on primary skid trails. Two studies were established to assess the effects of trafficking on soil …
-
Effects of Timber Harvesting on Terrestrial Salamander Abundance and Behavior
… cinereus) and slimy salamanders (P. glutinosus). Timber harvest caused up to a 2-fold increase or decrease in activity rates. There was evidence for bias in the night census method, but differences were not consistent enough to suggest general bias corrections. We also tested whether poorly fed …
-
Soil compaction caused by timber harvesting in central Appalachian hardwood forests
Two commonly used harvesting systems in central Appalachia were examined to determine the amount of soil compaction associated with each harvest type. A manual system of chainsaw and cable skidder, along with a mechanized system consisting of feller-buncher and grapple skidder were monitored in two …
-
The relationship between tourism and timber harvesting: A social psychological approach
… of tourism and the traditional importance of timber industries in some states, it is necessary to understand the relationship between the two. This concern is based on the fact that for some regions, such as the Northwest, the physical environment, which serves as a prime attraction for …
-
Camping in clearcuts: the impacts of timber harvesting on USFS campground utilization
… seeks to inform the site location of future timber harvests relative to existing campgrounds by analyzing how past and current harvests near campgrounds have influenced campground utilization. Beyond this, the research also informs the expected impacts of timber harvesting and recreation on …
-
A Markov process methodology for modeling machine interactions in timber harvesting systems
Recent advancements in timber harvesting systems analysis have been almost exclusively simulation based. A similar degree of effort in developing analytic models has been conspicuously absent. That part of timber harvesting analysis where simulation plays its most vital role is the study of machine …
-
Experiments to Measure the Effects of Timber Harvesting Equipment on Surface Lithic Scatters
… I undertook experiments on the effects of timber harvesting on lithic scatters on Modoc National Forest. The experiments involved placement of 225 glass tiles (proxy lithics) in each of three plots subject to vehicle traffic and log dragging by steel-tracked and rubber-wheeled equipment. …
-
Case Studies in Value Improvement in Hardwood Timber Harvesting Operations in the southern Appalachians
Three independent case studies focused on harvesting operation value improvement: (1) A productivity study was carried out on a new cable logging operation near Pikeville, Kentucky to document the effect of professional training on production efficiency. The crew received one full week of …
-
The impact of group selection silviculture on timber harvesting cost in the southern Appalachians
National Forest timber management in the southern Appalachians is changing from traditional even-aged management and clearcutting to uneven-aged management and group selection silviculture. Group selection, with its small 1/2-to-2-acre patch cuts widely dispersed throughout a timber stand, has the …
-
Influences of varying stand harvest methods on timber harvesting costs in southwestern Virginia hardwoods
A method was developed for estimating costs of harvesting operations in the hardwood stands of the Appalachian region of southwestern Virginia. The method was then tested on one logging operation to estimate the cost of harvesting a group selection tract as compared to a clearcut. Eight loggers …
-
Loggers' perceptions of the costs of best management practices on timber harvesting operations in Virginia
… can have a financial impact on the cost of harvesting timber in Virginia. Two hundred seventy-two timber harvesters were surveyed to determine the estimated cost for implementing best management practices (BMPs) on harvested sites. BMPs analyzed in this study are pre-harvest planning, road …
-
A Computer Simulation Model for Predicting the Impacts of Log Truck Turn-Time on Timber Harvesting System Productivity
… developed to represent a logging contractor's harvesting and trucking system of wood delivery from the contractor's in-woods landing to the receiving mill. The Log Trucking System Simulation model (LTSS) focuses on the impacts to logging contractors as changes in truck turn times cause an …
-
Effects of Diameter-limit and Two-age Timber Harvesting on Songbird Populations on an Industrial Forest in Central West Virginia
… some evidence that forest fragmentation due to timber harvesting has different effects on bird abundance than fragmentation from other land uses. It is unknown how songbirds respond to different forms of timber harvesting as fragmentation events. Also, it is unclear if microhabitat-level or …
-
Assessing Organic Matter Breakdown and Associated Macroinvertebrate Community Structure in Headwater Streams: Effects of Hydrologic Gradients and Upland Timber Harvesting
… the effects of hydrologic gradients and upland timber harvesting with different streamside management zone widths on yellow-poplar (<i>Liriodendron tulipifera</i>) processing and the associated macroinvertebrate community structure in the Cumberland Plateau ecophysic region, U.S.A. Prior to …
-
A comparison of computer simulation techniques in depicting and communicating the visual impacts of timber harvesting in the Jefferson National Forest
Advances in computer technology have made it possible for designers to manipulate realistic images on a computer screen. Previously, most computer generated images consisted of line drawings or distorted grid perspectives. A program known as PC/NewPerspectives, which generated distorted grid …
-
Timber Harvesting and Site Preparation Effects on Soil Quality for Loblolly Pine Growing on the Lower Coastal Plain of South Carolina
… inundates the surface several times each year. Harvesting timber under wet site conditions often results in extensive soil compaction, rutting, soil displacement, and waterlogging. Forest managers are concerned that these visually-displeasing soil disturbances may cause site damage and reduced …
-
Long term effects of wet site timber harvesting and site preparation on soil properties and loblolly pine (Pinus taeda L.) productivity in the lower Atlantic Coastal Plain
… term studies have suggested that ground based timber harvesting on wet sites can alter soil properties and inhibit early survival and growth of seedlings. Persistence of such negative effects may translate to losses in forest productivity over a rotation. During the fall and winter of 1989, …
-
Investigation of the Effects of Timber Harvest On Artifact Locations
<p>This thesis looks at the effect of timber harvesting on archaeological resources. Before federal agencies undertake any activity on federal land, Section 106 of the National Historic Preservation Act (NHPA) requires that they consider how their work will affect cultural resources. Assessments …
-
Conservation and management of the Allegheny woodrat in the central Appalachians
… habitat use, at colony sites representing two timber harvesting methods, clearcutting and diameter-limit harvesting, and unharvested controls. Home range and foraging distance estimates were calculated from telemetry locations and compared among treatments. Microhabitat variables were measured …
Page 1 of 3