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 40 for “"whole-tree"”.
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The in-woods cleaning of whole-tree-chips
This research examined Whole-Tree-Chip cleaning methods applicable to field operations in Pinus taeda L. (Loblolly pine) on the coastal plain of South Carolina. Objectives were: 1) to examine current and potential cleaning methods, and 2) develop and test two cleaning approaches suggested by past …
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Hardwood whole tree chips: a fuel storage model analysis
A pile of mixed hardwood whole tree chips was monitored for one year to identify the effects outside storage would have on the fuel potential of the exposed pile. A 20 foot conical pile was built by gravity feed from an overhead conveyor. Moisture content, fiber loss, ash, specific gravity, higher …
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The effect of whole tree chips in pulp and papermaking
… important subject of discussion in the 1970's. Whole tree chipping, or the use of all above-ground portions of trees, is a feasible method of achieving this goal. Many reports have been published in the field of pulping whole tree chips, and articles pertinent to softwood pulping are discussed …
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Analysis of shaker unit parameters to separate whole-tree wood chips
The quality of whole-tree wood chips has been the focus of much attention during the past few years because of the increased use of lower grade wood über in pulp production. The need to up-grade the quality has resulted in the use of some form of screening system to separate acceptable wood chips …
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THE EFFECTS OF WHOLE TREE HARVESTING ON SITE HYDROLOGY AND SOIL STRUCTURE AT BEDDGELERT FOREST, N. WALES, UK
… hillslope hydrologies of one forested and one whole tree harvested site. Particular attention was paid to the influence of trees both directly on soil water pathways and indirectly on soil characteristics. Atmospheric inputs were monitored for the slope and individual plots for one year. In …
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Nutrient dynamics of the forest floor in an Appalachian oak forest stand following clearcutting and whole-tree removal
… oak forest stands following clearcutting and whole-tree removal. Samples from the L, F, H, and A₁ layers were collected during June, August, and November of 1979 and 1980. Monthly litterfall was collected from October, 1979, through October, 1980. Soil solution samples were extracted on a …
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Effects of Clearcutting with Whole Tree Harvesting on Woody and Herbaceous Plant Diversity After 17-Years of Regrowth in a Southern Appalachian Forest
… the effects of clearcut regeneration with whole-tree harvesting on plant diversity. Three approaches were used to study changes in species composition and structure: (1) forest level, (2) stand level, and (3) diversity indices. Within each approach the forest was stratified into three …
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Long-Term Effects of Thinning and Prescribed Fire on Tree Growth and Bark Beetle Demography in a Jeffrey Pine Stand
… thinnings implemented with cut-to-length and whole-tree harvesting systems followed by underburning were evaluated for their effects on long-term individual tree and stand level growth responses as well as bark beetle demography in pure, uneven-aged Jeffrey pine (Pinus jeffreyi Grev. & Balf.) …
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Branch, crown, tree and stand water flux in an 180-year-old loblolly pine plantation after thinning, fertilization, and throughfall exclusion treatments
Branch and tree sap flux density (SFD) was measured to evaluate the effects of thinning, fertilization, and throughfall exclusion treatments on water use by loblolly pine (Pinus taeda L.) trees. Variations in SFD at different radial xylem depths were also examined to improve estimates of tree water …
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Soil Carbon, Nutrients, and Phosphorus Fractions: Responses to Weed Control and Harvest Residual Retention in two 10-Year-Old Douglas-fir (Pseudotsuga menziesii) Stands of the Pacific Northwest
Intensive forest management techniques such as whole-tree harvesting and use of herbicides to control weeds can have an effect on nutrient cycling and nutrient pool sizes in the mineral soil. This study was conducted to measure differences in soil carbon (C), nutrient pools, or phosphorus (P) …
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Canopy transpiration of beech forests in Northern Bavaria – Structure and function in pure and mixed stands with oak at colline and montane sites
Mixed stands of broadleaved deciduous tree species are increasing in importance in Bavaria and all of Germany, especially in the context of climate change, forest conversion and sustainable forestry. Very few investigations to date have quantified the canopy transpiration of mixed forest stands, …
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The use of roll-off bins and a hook-lift equipped harwarder and truck for forest biomass utilization
… Harwarder, cut-to-length, and ground based whole-tree harvest systems were analyzed using productive total cycle time equations and independent variables. Some systems were observed in the field while others were modeled. Sixteen systems (equipment combinations) were analyzed plus one hand …
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The use of roll-off bins and a hook-lift equipped harwarder and truck for forest biomass utilization
… Harwarder, cut-to-length, and ground based whole-tree harvest systems were analyzed using productive total cycle time equations and independent variables. Some systems were observed in the field while others were modeled. Sixteen systems (equipment combinations) were analyzed plus one hand …
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Regional Nutrient Budgets in Forest Soils in a Policy Perspective
… within the period of one forest rotation. The whole-tree harvesting scenario indicated substantially higher base cation losses than the stem harvesting scenario in spruce forests, while the losses were significantly lower in pine forests. The nitrogen budget calculations indicated a risk of …
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Estimates of above-ground phytomass and nutrients in the understory vegetation in an Appalachian oak forest in Virginia
… compartments which are to be clearcut and whole-tree harvested in the near future. A partial random sampling scheme was utilized to select 20 x 20m study areas, within which 48 1 x 1 m and 16 5 x 5 m herb and shrub stratum plots were nested respectively. Statistical tests indicated that …
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Even-aged regeneration alternatives for low quality oak hardwood forests in the Virginia Piedmont
… are examined three years after clear felling and whole-tree harvesting upland hardwood stands in the Virginia Piedmont. Natural hardwood regeneration was dominated by stump sprouts, with seedlings and advanced regeneration playing a secondary role. Stump sprouts and seedlings plus advanced …
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Analysis of the baling concept for increased fiber recovery on harvested forest sites
… baler equipped system is a viable alternative to whole tree chipping for the recovery of forest residues. The baler equipped system has the advantages of less capital investment, less stringent operating requirements and the potential to generate more profits on stands of at least moderate timber …
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Pentagonal scheme for dynamic XML prefix labelling
… research problem as it means relabelling a whole tree. Our algorithms provide an efficient dynamic XML labelling scheme that supports data updates without duplicating labels or relabelling old nodes. Our work evaluates the labelling process in terms of size and time, and evaluates the …
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