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 39 for “"soil environment"”.
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Fate and effects of pulp mill effluent solids in the soil environment
… solids have concluded that the risk posed to the environment is low, few have investigated the potential toxicity of these wastes to soil organisms, and these studies did not directly address the effects of resin extractive compounds. Resin extractives have been shown to be recalcitrant and to …
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The Analysis Of Preserved And Degraded Human Skeletal Material: Understanding Relationships Between Bone And The Soil Environment
The relationship that soil interred human bone has with the burial environment has implications for the survival of the organic and inorganic components, including collagen and DNA. The study of both the Chapel House Farm Medieval cemetery, Poulton, Cheshire, UK, and contemporary skeletal remains …
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Fine Root Dynamics in a Pinus palustris Mill. Ecosystem: The Role of Sampling Interval and the Soil Environment
… Chapter 2 Abstract: We examined the impact of soil environmental variables (soil temperature, moisture, and available nitrate (NO3-) and ammonium (NH4+)) on the production, mortality, standing crop, turnover, and lifespan of Pinus palustris Miller fine roots using the minirhizotron technique. …
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THE EFFECT OF BIOTIC AND ABIOTIC FACTORS WITHIN THE SOIL ENVIRONMENT ON THE MORTALITY OF IXODES SCAPULARIS DURING THEIR OFF-HOST PERIODS
… or inactive during non-questing periods in the soil. Despite the prolonged periods this species spends off-host, the effects of the biotic and abiotic components of the soil ecosystem on the mortality of I. scapularis is not well-characterized. I began by exploring the effect of hot, dry weather …
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The Effect of Nematode Isolate and Soil Environment on the Tobacco cyst Nematode (Globodera tabacum solanacearum), a Pathogen of Flue-cured Tobacco and Other Solanaceous Crops
… to compare TCN reproduction in non-infested soils with currently TCN-infested soils, and to examine reproduction and pathogenicity of TCN on other solanaceous crops. Tobacco cyst nematode reproduction on the TCN-resistant cultivar NC567 was significantly reduced when compared to the …
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The mobility of malathion in a silt loam soil as affected by phosphate and naturally occurring organic acids
… study of the mobility of Malathion in the soil environment was conducted.
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Long-term Effects of Fertilization on Phosphorus Biogeochemical Pools in Forest Soils
… (N) and phosphorus (P) availability in the soil environment. While the absolute quantities of P in forests soils may be large, the concentration of inorganic P in the soil solution is typically very small (< 0.01 mg L²-1). A onetime application of just 56 kg P ha²-1 can substantially …
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Insights in plant ecology from Bromus tectorum invasion in the Great Basin, USA
… influence of biological characteristics, environmental conditions, anthropogenic disturbance, grazing, and fire on B. tectorum invasion. Third, a hypothesis of invasion that states 'species may induce changes in their environment that increase invasiveness' is examined. Specifically, the …
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An investigation into the use of smectitic clay soil for the containment and treatment of petrochemical waste
… quantities of organic substances into soil, from which they are subject to possible transport into underlying groundwater. Many of these organic chemicals are potentially toxic (Wilson et al., 1981). Information is required concerning the chemical and physical behaviour of organic …
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Coarse Woody Debris in Industrially Managed Pinus taeda Plantations of the Southeastern United States
… forested ecosystems by adding organic matter to soils, stabilizing the soil environment, providing wildlife habitat, preventing soil erosion, providing seedling establishment habitat, and involvement in the nutrient cycle. Most CWD research has been conducted in old-growth and unmanaged, …
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Quantification of short term interactions between soil and fungi
… and quantify short-term interactions between soil-borne fungi and soil. The quantification captures interactions between the ubiquitous soil saprotroph and plant pathogen <i>Rhizoctonia solani</i>, and a sandy loam soil, over a period of five days. The literature review provides evidence of …
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Mechanisms and management for soil carbon sequestration
Soil organic matter (SOM) holds more carbon (C) than the atmosphere and terrestrial aboveground biomass combined. SOM also provides many other co-benefits in the form of ecosystem services. The rate at which we lose or sequester more C in soils is of great importance for mitigating the rising …
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Deep-Layer Terrestrial Hydrologic Memory and Mechanisms of Its Influence on the Eco-Climatology of the Biosphere
… memory is limited to the near-surface soil, and the role of deep-soil reservoir is unknown or has simply been neglected. Observational evidence shows the existence of plant roots much deeper in the soil/rock profile than the depth usually incorporated in existing land surface models. …
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A study of bone chemistry in forensic applications
… time of bones. Bones were buried in diverse soil environments for 18 months and subsequently examined using various analytical techniques. Pig rib bones were used as an analogue for human bones. The burial environments varied in factors including soil type, soil pH, moisture content and …
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The regulatory role of MtrA and NsrR in streptomyces coelicolor
Streptomyces coelicolor inhabits a harsh soil environment, which it must adapt and respond to; therefore how S. coelicolor senses and responds to its environment is of the utmost importance. This project addresses two types of regulation system: the three-component system MtrAB-LpqB and the …
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Engineering plant-microbe communication for synthetic symbioses
… pathways, able to diffuse through the complex soil environment, readily produced from common cellular precursors, and easily sensed at low concentrations. In this thesis, I review the genetic parts and regulators available for use in plants and the types of natural and engineerable …
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Evaluation of Nitrogen Sources, Starter Fertilizers, and Amendments for No-Till Corn Production
… production creates a decidedly different soil environment than a conventional system that receives annual tillage, which presents challenges to the management of nitrogen (N) fertility. Two on-farm studies were conducted to evaluate N fertilizer sources, starter fertilizers, and fertilizer …
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Targeting tillage intensity in Michigan soybean systems: On-farm observations and multivariate modeling of grower decision-making with implications for yield and soil carbon
… multiple, sometimes competing, economic and environmental objectives when deciding what level of tillage intensity is appropriate for a given field. Research has shown that decreasing soil disturbance can reduce the cost of soybean production, but the effects of conservation tillage on the …
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The mobility of endosulfan and chlorpyrifos in the soils of the Hex River Valley
… the mobility of these two pesticides in the soil environment. Two soils, representative of the soils in the Hex River Valley, were sampled in August 1998. A range of chemical analyses was performed on the samples including pesticide sorption experiments in which gas chromatography coupled …
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Forensic taphonomy: investigating the post mortem biochemical properties of cartilage and fungal succession as potential forensic tools
… changes in degrading porcine cartilage buried in soil environments and its potential to determine PMI in the crucial two days to two months period. Trotters were interred in a number of graves at two distinct locations exhibiting dissimilar soil environments. Weekly disinterments (for 6 weeks) …
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