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 18 of 18 for “"soil ecology"”.
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The soil ecology of Serratia entomophila, A bacterial pathogen of the New Zealand grass grub, Costelytra zealandica (White)
… pathogen's attributes. An understanding of the ecology of s. entomophila, in particular its persistence in the grass grub's environment, is essential if full advantage is to be gained from its pathogenicity towards the insect. Laboratory and field experiments were conducted to determine the …
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Soils and Interventions
Linus Lancaster Soils and Interventions Dissertation Abstract The problem that I have identified during my research for this dissertation is the quantifiable depletion and exhaustion of large percentages of the world's soils through human activity in agriculture and other industrial practices. In …
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The algebraic statistics of sampling, likelihood, and regression
… in the sciences featuring case studies from soil ecology and nonparametric statistics closes the thesis.
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Nitrification inhibitors have minimal impact on microbial and Collembola communities in Danish arable soil
… impacts of nitrification inhibitors (NIs) on the soil microbial and collembola communities in arable soils under a spring barley cultivation system. By assessing soils where inhibitors were repeatedly applied alongside fertilizers, we evaluated the short-term effects of NI use on soil biodiversity …
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Sustainable landfill leachate treatment using a willow vegetation filter
… the effects of landfill leachate irrigation on soil ecology, soil chemistry and willow growth were undertaken. Two low cost, high density polyethylene-lined experimental willow plots (25x50 m2) were installed at Cranford landfill, Northamptonshire, UK, and irrigated with landfill leachate …
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Estimating Sources of Valley Fever Pathogen Propagation in Southern Arizona: A Remote Sensing Approach
… spp. The fungi reside in arid and semi-arid soils of the Americas. The disease has increased epidemically in Arizona and other areas within the last two decades. Despite this increase, the ecology of the fungi remains obscure, and environmental antecedents of the disease are largely …
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Understanding polycyclic aromatic hydrocarbon degradation by soil microbial communites: the concentration and distribution of aromatic dioxygenase genes
… important development in the field of microbial ecology. Researchers are now able to quantify and map populations and communities, the presence of which could only be inferred until recently. Knowledge of this ecology is critical to understanding microbial responses to environmental pollutants, …
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Moving the needle on prairie conservation: a Palouse Prairie restoration/reconstruction needs assessment and the effect of intra-annual soil moisture changes on Balsamroot seedling establishment
… 2) gain insight into the effects of intra-annual soil moisture fluctuations on the seedling establishment of Arrowleaf balsamroot (Balsamorhiza sagittata), since establishment of slow growing perennial species like balsamroot remains a challenge for restoration projects. We interviewed fourteen …
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Soil microbial function in a time of global change: effect of dairy antibiotics on soil microbial communities and ecosystem function
… whether antibiotics have effects beyond soil through impacts on plant-microbe-soil feedbacks, thus potentially altering terrestrial ecosystem function. Chapter 4 investigates how rising global temperature interacts with antibiotic exposure through a microcosm-incubation experiment. These …
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Impacts of Invasive Asian Jumping Worms on Soil Properties in Turfgrass Systems and their effects on Plant Nutrient Acquisition and Physiological Responses in Greenhouse Experiments
… abundance, microbial enzyme activity, soil chemical and physical properties, and turf condition. The study was conducted at four residential sites in southwest Virginia, each with garden bed infestations and adjacent turfgrass lawns. Sampling occurred in May and September 2024. At each …
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The relationship between invasive annual grasses and biological soil crust across Eastern Washington
… component of invasion resistance is biological soil crust (biocrust), which has been shown to limit Bromus tectorum (cheatgrass) in arid regions. However, biocrust has been less studied in semiarid regions and its effects on other invasive annual grasses, such as Ventenata dubia, have never been …
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Disentangling Perceived and Measured Soil Health in New York City Urban Farms
Soil contamination is often addressed by constructing new compost-based soils for urban agriculture. We examined these constructed soils to assess soil health across a diversity of farming sites across New York City, consulting with farmers to characterize their soils as “healthy” or “unhealthy” …
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Environmental controls on the abundance, diversity, growth, and activity of ammonia-oxidizing microorganisms in temperate forest soils
… microbial communities in temperate forest soils. Accomplishing this goal required a hybrid approach: I used modern molecular biology techniques alongside soil biogeochemical measurements and framed my research using ecological theory largely developed in plant systems. All of my field work …
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Sociobiology of the hypogaeic army ant Dorylus (Dichthadia) laevigatus Fr. Smith
… description of this species' morphology, ecology, and interactions with D. laevigatus is provided. My study indicated D. laevigatus to be an ecologically important species, able to influence soil structure and organisms of tropical regions in many ways. Relating the observed traits of D. …