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 36 for “"forest trees"”.
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Effects of water stress and application timing on glyphosate activity in forest trees
Field and greenhouse studies were conducted to investigate the role of water stress and time of glyphosate spraying in the variation in glyphosate efficacy. Data on water potential, foliar sugar and starch content, weather, and growth response were gathered for loblolly pine and four of its major …
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The bio-ecology, economical importance and control of three saturniids injurious to forest trees
… of especially Pinus patula Schlechtd. & Cham. trees. These studies were undertaken to gain more knowledge of the biology and ecology of these insects, so that effective and economical methods of controlling them can be devised. A further aim was to make a comparison between the potential wood …
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Growth response and drought susceptibility of forest trees exposed to simulated acidic rain and ozone
… alter the growth and drought susceptibility of forest tree species under laboratory conditions. Forest trees which are periodically exposed to ambient ozone and acidic rain in natural forest ecosystems probably have a response similar to the results from this study. Additional research is …
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Native forest tree conservation in tropical agroforests: Case study of cacao farms in the Atlantic Forest of southern Bahia, Brazil
Agroforests are model systems for ecological conservation in tropical agricultural landscapes because they integrate biodiversity conservation and rural livelihoods. Whether agroforests are long-term solutions for conserving biodiversity in agricultural landscapes may depend sapling regeneration of …
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Growth loss of loblolly pine (Pinus taeda L.), white pine (P. strobus L.) and sycamore (Platanus occidentalis L.) proximal to a periodic source of air pollution
… air pollution regime on the growth of forest trees was investigated. Radial increment growth studies were conducted to determine if correlations existed between emission levels of a source (predicted by production levels) and radial increment growth of forest trees. Three stands of …
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Sequence capture as a tool to understand the genomic basis for adaptation in angiosperm and gymnosperm trees
Forest trees represent a unique group of organisms combined with ecological and economic importance. Owing to their random mating system and widespread geographical distribution, they harbor abundance genetic variation both within and among populations. Despite their importance, research in forest …
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Roots of Enquiry: Farmers, Forests and Tree Cover Change in Kwahu East, Ghana
… since 2011. Based on a small field site in the forest-farm landscape of Kwahu East, Ghana, their research concluded that tree cover is declining. They hypothesised that this could be affecting the birds’ wintering habitat and wanted to understand better what social and economic factors are …
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An examination of methods for localizing site index equations
Equations for modeling the height-age pattern of forest trees or stands are typically developed for a given species in a specified region. In order to adequately model height-age patterns, the resulting equations are often quite complex. This study addresses the question of how to increase the …
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Evolutionary Genomics of Populus trichocarpa (Western Poplar)
Forest trees are an important pool of biodiversity at the gene, individual and an ecosystem level. This variation is a result of complex environmental interactions, as well as neutral and selective forces acting on populations. Patterns of standing genetic variation are the result of adaption to …
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The colonisation of fynbos and disturbed sites by indigenous forest communities in the Southern Cape
The area covered by indigenous forests in the Southern Cape has been and is still diminishing as a result of 1 road construction (for example, 28 ha of indigenous' forest has recently been clear-felled for a new highway), power lines, settlements, fires (man-made and natural, for example the fires …
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Carbon and Water Relations in Pinus Taeda: Bridging the Gap across Plant Physiology, Genomics, and Global Climate Change
… processes affecting carbon and water exchange in forest trees because (1) trees are long-lived species that might face repeated environmental challenges; (2) relatively little information exists about the genes and the molecular mechanisms regulating structural and physiological traits in adult, …
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A GIS-Based Watershed Impact Management Model
… The replacement of all non-urban areas with forest trees in the Yocona river basin, (scenario c) resulted in decreased runoff and sediment yield. The WIM modeling approach in the quantification and assessment of impacts of land use change can be applied to all watersheds, even those with …
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Machine learning and information-theoretic approaches for financial applications
… and finance. In Chapter 2, we utilized random forest trees to predict the annual direction of profitability for firms with a minimal amount of information. We demonstrate that we can out-perform benchmark models typically used in financial accounting research. Major public firms announce their …
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Nipping the bud hypothesis : a comparison of savannah and forest tree responses to canopy scorch
… following surfaces fires, is much greater in forests than in savannas, despite similarities in the bark thickness of tree trunks. This difference is thought to influence the distributions of forest and savanna biomes. There is no consensus and very little research on how fires actually kill …
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Preceramic procurement patterns at Krum Bay, Virgin Islands
… in minimal amounts. Plant remains show that forest trees provided foods as well as other materials. Direct evidence of plant cultivation was not found, although the pollen record does suggest increasing forest disturbance near the site. Artifacts primarily include expediently flaked igneous …
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Partitioning of multivariate phenotypes using regression trees reveals complex patterns of adaptation to climate across the range of black cottonwood (Populus trichocarpa)
Local adaptation to climate in temperate forest trees involves the integration of multiple physiological, morphological, and phenological traits. Latitudinal clines for the relevant component traits are frequently observed for species that have a north-south distribution, but these relationships do …
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Biology of virulent and hypovirulent Endothia parasitica on American chestnut (Castanea dentata)
… of grafts, seedlings, excised stems, and intact trees of large, surviving American chestnut indicated that some have heritable blight resistance. Some degree of resistance in American chestnut possibly would assist spread of hypovirulence (H) factors. The pathogenicity of the H isolate but not …
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Bird Activity and Seed Dispersal in Two Neotropical Trees: Guarea Macrophylla and Trichilia quadrijuga
… seed dispersal of two sympatric neotropical rain forest trees: Guarea macrophylla and Trichilia quadrijuga. Of 24 bird species that consumed Guarea fruits, only four (Catharus ustulatus, Myoidynastes luteiventris, Pipra coronata, and P. fasciicauda) consistently visited and dispersed its seeds. Of …
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The Influence of Forest Structure on Sumatran Orangutan Nesting and Densities in the Lowland Dipterocarp Forests of North Sumatra
… tree and why build the nest in that part of the forest and not another? Nest and forest structure data were recorded from transects conducted at two sites in North Sumatra; Sikundur (a naturally recovered site) and Sei Betung (reforested site). Selection patterns for tree and forest structure …
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Discovery of New Protein-DNA and Protein-Protein Interactions Associated With Wood Development in Populus trichocarpa
… energy source is to use the biomass derived from forest trees to fulfill the need for a renewable alternative fuel. Through increased understanding and optimization of regulatory mechanisms that control wood development the potential exists to increase biomass yield. Transcription factors (TFs) …
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