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.
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Showing 1 to 20 of 28 for “"forest harvesting"”.
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Technological innovation in forest harvesting
… study of technological innovations in industnal forestry and timber harvesting practices provides a basis for a critique of these previously proposed models and for an argument for a new model. This model, an ecological model, suggests homeostatic pressures play a major role in the innovative …
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Long-Term Effects of Forest Harvesting on Habitat Use By Insectivorous Bats
The short-term effects of forest harvesting on forest-dwelling bats have received considerable attention. However, knowledge about the long-term effects are also essential to better conserve forest-dwelling bat populations in North America. As vegetation regenerates over time post-harvest, changes …
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A method of data collection for the evaluation of forest harvesting systems
… for documenting the mechanical performance of harvesting machines and systems under specified conditions is presented. It provides a data collection method as a basis for evaluation of systems across international boundaries for better selection of machines, prior to bearing the expense of …
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Application of Spectral Change Detection Techniques to Identify Forest Harvesting Using Landsat TM Data
… change technique best suited to detect complete forest harvests (clearcuts) in the Southern United States. In the pursuit of this objective eight existing change detection techniques were quantitatively evaluated and a hybrid method was also developed. Secondary objectives were to determine the …
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Effects of forest harvesting best management practices on surface water quality in the Virginia coastal plain
… were monitored to evaluate effectiveness of forestry best management practices (BMPs) for minimizing hydrologic and water quality impacts associated with timber harvesting. One watershed was clear-cut without implementation of BMPs, one watershed was clear-cut with the implementation of BMPs …
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Physical and Hydrologic Responses of an Intensively Managed Loblolly Pine Plantation to Forest Harvesting and Site Preparation
… important. These highly productive forests have been intensively managed as pine plantations for the past few decades. More recently, harvesting and site preparation practices have become a concern among natural resource managers because intensive forestry practices may alter soil …
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Forest Harvesting Disturbance and Site Preparation Effects on Soil Processes and Vegetation in a Young Pine Plantation
… study was conducted to determine the effects of harvesting-induced soil disturbance, bedding and chemical vegetation control on soil processes and productivity, and to characterize the effects of silvicultural treatments on non-crop vegetation dynamics. Study plots were established on a wet pine …
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Impacts of forest harvesting on the performance of soil-landscape modelling in a radiata pine forest, northern New Zealand
New Zealand's forestry industry requires new information on the spatial distribution of certain target soil properties and locally significant soil classes in order to implement sustainable and site-specific forest management practices. Soil-landscape modelling has been identified as a potentially …
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An analytics-based decomposition approach to large-scale bilevel optimisation
… structure allows for the reformulation of the forest harvesting problem as a multiple-follower bilevel problem. In the forest harvesting problem of Chapter 4, trees are cut into different log types, some of which are more valuable than others. Due to the fact that harvesting machines are …
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Robust scheduling in forest operations planning
Forest operations planning is a complex decision process which considers multiple objectives on the strategic, tactical and operational horizons. Decisions such as where to harvest and in what order over different time periods are just some of the many diverse and complex decisions that are needed …
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Effects of Forest Regeneration Methods on Salamander Populations in Central Appalachia
In forested ecosystems, salamanders occupy important ecological roles as predator, prey and as potential regulators of ecological processes. The effects of forest management, particularly clearcut harvesting, on salamanders have been well documented; removal of overstory trees negatively affects …
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A comparison of community composition analyses for the assessment of responses to wood-ash soil amendment by free-living nematodes
… assessment for free-living soil nematodes under forest harvesting disturbance and wood ash application. Neither morphological assessment (richness, abundance, diversity) nor molecular assessment (morpho-richness using T-RFLP) was responsive to experimental treatments. Trait-based approaches …
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Information privée, attraction conspécifique et sélection d'habitat chez la paruline couronnée (seiurus aurocapilla)
Across the world, forest harvesting is one of the human activities having the greatest impact on biodiversity. Many studies have been conducted to better understand these impacts in the hope of minimizing their consequences. In New Brunswick, one type of "partial harvesting" is increasingly being …
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Modeling the Effects of Forest Road Density on Streamflow in the Blue Ridge Mountains
Forested watersheds have often been managed for flood mitigation. Studies have shown that forests have the potential to minimize peak flows during storm events, yet the relationship between forests and flooding is inexact. Forest roads, usually found in managed systems, can potentially magnify the …
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Potential use of wide tires for steep slope skidding
… the potential use of wide skidder tires for forest harvesting operations on steep slopes. During the summer of 1984, field tests were conducted to compare the performance characteristics of 24.5-32 and 66-43 rubber tires on a JD-640 grapple skidder loaded with tree length material. The …
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Effects of Forestry Streamside Management Zones on Stream Water Quality, Channel Geometry, Soil Erosion, and Timber Management in the Virginia Piedmont
… stream bank integrity in headwater streams where forest harvesting has taken place, as well as comparing other SMZ widths with regard to the same environmental protection performance. In 2003, 16 forested watersheds were clear-cut harvested for commercial timber production. Four SMZ treatments …
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Opportunities for Standardization in Monitoring of Best Management Practices in the Southeastern United States
Silvicultural activities, particularly forest harvesting operations, have the potential to negatively impact water quality. In order to lessen the probability that water quality degradation will occur, a suite of best management practices has been developed and adopted by southeastern states. The …
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Relationships Between Streamside Management Zone Width and Biotic Communities of Headwater Streams in West Virginia
… silvicultural operations is recognized by the forestry Best Management Practices of most states. However, research concerning the SMZ width and harvesting intensity required to maintain water quality and biotic communities is limited. The goal of this study is to evaluate the efficacy of …
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The Influence of Selection Silviculture Biomass Harvesting on Soil Carbon, Nutrients, and Respiration in a Northern Mixed-Deciduous Forest
… recovery of biomass in northern mixed deciduous forests. Several studies suggest that biomass extraction and enhanced decomposer activity can lead to losses of soil C and nutrients, increased nitrification, and reduced soil CO2 efflux (FCO2) from compaction and root senescence. However, results …
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Movements of adult western toads, Bufo boreas, in a managed forest landscape and the incidence of a disease in southwestern British Columbia
… of this thesis were to (1) determine how forest fragmentation affects western toad movement behaviour; and (2) determine if there is any evidence of the infectious disease, the chytrid fungus (Batrachochytrium dendrobatidis), in this species in British Columbia. I used radio-telemetry to …
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