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 237 for “"Forest Sciences"”.
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Analysis of the Potential for Diazotrophic Endophytes to Increase Efficiency of Bioenergy Crop Production: Growth promotion effects of the endophytes isolated from Populus trichocarpa and Salix sitchensis
… Dr. Sharon L. Doty School of Environmental and Forest Sciences Sustainable production of biomass for bioenergy relies on low input crop production. Inoculation of bioenergy crops with plant growth promoting endophytes has the potential to reduce the fertilizer inputs through the enhancement of …
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Wild American crows use funerals to learn about danger
… Dr. John Marzluff School of Environmental and Forest Sciences While a growing number of animals demonstrate seemingly ritualistic behaviors around the death or body of a conspecific, the evolutionary basis for this behavior remains unclear. Here we demonstrate that wild American crows (Corvus …
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The Effects of Prescribed Burning on Nutrient Content of Selected Understory Species in an East Texas Loblolly-Shortleaf Pine Stand
<p>The objectives of this study were to determine whether prescribed burning affected nutrient levels in leaves and twigs of six species and whether there were differences in response between leaves and twigs. Backfire and headfire treatments were used to determine differences between burning …
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Sulfate Leaching from Sulphur Binding Agents in Experimental Asphalt Pavement, Angelina County, Texas
<p>Sulfate leaching from sulphur-binding agents used in asphalt pavement was significantly higher (p>.05) from four layers of a mixture of a single aggregate base material of hot sand, when compared to all other treatments. Analysis of the data showed that the other treatments had no overall effect …
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Pine Seedling Survival and Growth Related to Moisture Retention of Eight Texas Forest Soils
… moisture retention characteristics. Costly reforestation failures can be avoided by examining the soil moisture retention characteristics of prospective planting sites to determine mortality risks and required site preparation in this or other areas that are characterized by recurrent …
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Aspects of Some Compacted Campground Ameliorating Practices
<p>The purpose of this study was to determine if the direct mechanical manipulation of compacted campground soils, with and without the addition of organic materials and the planting of grasses, had any long lasting effect on the amelioration of these deteriorated campsites. An attempt was also …
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Effects of Site Preparation on Survival and Growth of Planted Loblolly Pine
… taeda L.) on a loblolly-shortleaf pine-hardwood forest site in East Texas are examined by determining the survival and growth of planted loblolly pine, soil chemical characteristics, and density and height of competing (non-pine) woody stems. Three replications of four site preparation treatments …
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Zinc Uptake in Loblolly Pine Seedlings
<p>Zinc concentrations in the root, terminal growth, stem, and needles of loblolly pine (Pinus taeda L.) were measured in 72 seedlings grown in washed sand, fertilized with Zn(N03)2. Zinc treatment periods were early spring, late spring, and summer. Zinc uptake was the greatest in early spring. …
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The Potential for Carbon Sequestration in Soils on Lignite Coal Minelands in East Texas
… have become interested in the potential of forests to sequester large amounts of carbon in their above- and below-ground biomass as well as in the soils. It has been estimated that if the world's deforested lands were reforested and properly managed, they could have the potential to …
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Use of Lignite Fly Ash as a Soil Amendment
<p>One-year-old loblolly pine (Pinus taeda L.) seedlings were grown in a greenhouse in potted mixtures of two Texas lignite fly ashes and a Troup sand, Sacul sandy loam, and a sandy clay loam strip-mine spoil. Mixtures contained 0, 25, 50, 75 and 100 percent fly ash. After six months, soil fly ash …
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Pisolithus Tinctorius Mycobiont Inoculations as a Factor in Performance of Containerized and Bare-Root Shortleaf Pine Seedlings on Lignite Minesoils in Panola County, Texas
<p>The effects of artificial soil infestation with basidiospores and vegetative mycelia of the fungal symbiont Pisolithus tinctorius on ectomycorrhizae development of short leaf pine (Pinus echinata) seedlings grown in styroblock containers were tested in the greenhouse. These preliminary tests …
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A Preliminary Preview of Compensatory Forest Plantation in Peninsular Malaysia
… and housing industries. Compensatory Forest Plantation Program (CFPP) is one of the methods taken by the Malaysian Government to avert this impending crisis. CFPP was officially launched in 1983, in four States of Peninsular Malaysia. By 1989, forest plantations totaling 36,874 …
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The Hydroclimatic Characteristics of Nacogdoches, Texas with Implications for Water Resources Management
<p>Sayok's (1986) study and statistical analysis of the climate at Nacogdoches, Texas covering 1901 to 1980 is updated to include the most recent twelve years (1981-92) of records. Missing data are estimated, all analyses are repeated, and the new 1961-90 normal climate is compared to the 1951-80 …
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Water Quality of East Texas Streams: Forested Versus Pastured Watersheds Receiving Poultry Litter Applications
… - November 1995). Three sites were located in forested watersheds and the other three sites were downstream of pastured watersheds surface-applied with poultry litter, a potential nonpoint source of pollution. Stream water samples were analyzed for Ca, K, Mg, Na, 03-N ,TKN, P04-P, TP, TSS, pH, …
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The Age and Fertility of Lignite Strip Mine Spoils from the Darco Mine, Harrison County, Texas
<p>Field observation of lignite strip mine spoils from the Darco mine near Marshall, Texas, revealed that gray spoil materials of various ages were devoid of vegetation. Within the same sites, spoil materials which were non-gray supported several conditions of revegetation. Analysis of spoil …
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Attitudes and Motivational Factors for Participation in the Becoming an Outdoors-Woman (BOW) Program
<p>Women participating in Becoming an Outdoors-Woman (BOW) program workshops were surveyed as to their attitudes, interests, and participation in outdoor recreation activities. The survey, administered to 265 women between October 2002 and June 2003, examined demographic characteristics, …
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Strength Properties of Juvenile and Mature Wood of Twelve Families of Loblolly Pine (Pinus Taeda L.)
<p>The wood mechanical properties of progeny from twelve open-pollinated parent trees were examined. Six families were from parents which had high wood specific gravity and six were from parents which had low wood specific gravity. Thirty-two-year-old trees, that had been planted at Many, …
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Validation of an Instrument to Measure the Change in Ecological Vocabulary of Teachers Attending Texas Environmental Education Advisory Committee Endorsed Programs
<p>An instrument was developed and evaluated for measuring the effect of the Texas Environmental Education Advisory Committee (TEEAC) endorsed teacher inservice programs on participants' ecological vocabulary. Principal study objectives were to establish a basic ecological vocabulary essential to …
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The Influence of Stand Density on Rate of Carbon Sequestration in Loblolly Pine Plantations on Mined Lands in East Texas
… production and carbon sequestration. PTAEDA2, a forest stand growth simulator, was used to predict growth and yield from establishment to final harvest. Dynamic computer programming was used to perform economic analyses given current stumpage prices, management costs, and real price and cost …
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Percent Accuracy by Crown Closure Classes of Woodland Stands Mapped from Skylab-4 Photography and Landsat-1 Imagery
<p>LANDSAT-l imagery and satellite photography have been utilized for land-use mapping. This study investigated the correlation between woodland stands mapped and their percent crown closure using LANDSAT-l imagery and Skylab-4 photography. On the basis of percent accuracy of crown closure classes …
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