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 546 for “"intensively"”.
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Valuing critical zone services in intensively managed landscapes
… the goods and services from landscapes. In intensively managed landscapes (IML), the provisioning, supporting, and regulating services are altered through anthropogenic energy inputs so as to derive more agricultural productivity from these landscapes. Land use change and other alterations …
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Analysis of sediment dynamics in intensively managed landscapes
… sediment transport, and sediment yield in an intensively managed agricultural landscape. This objective was accomplished by combining of field sampling and measurements, laboratory analysis, sediment fingerprinting study, statistical analysis and modeling exploration in the Upper Sangamon …
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Nitrogen loss inhibitors in intensively managed winter wheat
Several potential pathways exist for significant nitrogen loss from nitrogen fertilizer applied to winter wheat in Virginia. A number of materials have been previously identified which inhibit steps in one or more of these loss pathways. Ammonium polyphosphate, ammonium thiosulfate, dicyandiamide, …
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Aspects of the feeding behaviour of intensively reared trout
Feeding behaviour of trained rainbow trout was investigated by the use of demand feeders, under different light conditions. The effects of the energy content of diet, and the size, colour and texture of feed pellets, on the feeding behaviour, were studied. An attempt was made to locate the assumed …
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Coevolutionary dynamics under anthropogenic impact in intensively managed landscapes
… the soil organic carbon (SOC) dynamics in intensively managed landscapes, which have accelerated soil erosion, through modeling and simulation of the coevolution of landscape and SOC. In the river valley study, we distinguish between floodplains and terraces--two similar geometries in …
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Dynamics of inorganic soil-nitrogen age in intensively managed landscape
Our interests in reactive nitrogen and the nitrogen cycle have shifted from increasing the efficiency of nitrogen delivery to target crop species to decreasing environmental damage caused by intensive agricultural practices. Enhancing the reactive nitrogen use to increase food production to meet …
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Modeling and measurement of tile drain controls in intensively managed landscapes
… drain on ecohydrologic and nutrient dynamics in intensively managed agricultural fields at lidar-resolution scales. Explicit coupling between subsurface and tile flow is obtained by modifications of variably saturated Richards equation to capture the impacts of tile drain on soil moisture. The …
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Wild Turkey Ecology in Two Intensively Farmed Landscapes in Central Illinois
Hens moved long distances between seasonal activity centers and annual range size averaged 712.4 ha. Fall/winter ranges averaged 701.4 ha (SE = 102.3, n = 71) and were larger and more variable than nesting season ranges which averaged 404.0 ha (SE = 36.7, n = 93). Upland forest was preferred during …
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Modeling sediment loading and riverine water quality in intensively managed landscapes
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Simulation of Early Stand Development in Intensively Managed Loblolly Pine Plantations
A system of equations was developed and incorporated into the PTAEDA2 loblolly pine stand simulator to provide growth projections from time of planting. Annual height growth is predicted using a two-parameter Weibull function, where distribution parameters are estimated from equations that utilize …
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Paddock scale nitrous oxide emissions from intensively grazed pasture: Quantification and mitigation
… aimed at measuring the exchange of N₂O over an intensively grazed dairy pasture in New Zealand. The core of the work was based on eddy covariance (EC), a technique that allows measuring the N₂O exchange between the soil and the atmosphere at ten times per second. Since EC measurements of N₂O …
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Live crown ratio model and lumber recovery for intensively managed loblolly pine
… planted pine species in the Southern US which is intensively managed as well as a major contributor to the timber industry. Various silvicultural treatments are commonly applied to pine plantations including thinning and sometimes pruning. Tree crowns contain the active photosynthesis region and …
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Optimizing soil and fertilizer nitrogen use by intensively managed soft red winter wheat
Field experiments were conducted in the Coastal Plain and Ridge and Valley regions of Virginia during the 1981-82 through 1985-86 winter wheat growing seasons. The treatments in all experiments consisted of varying amounts of N fertilizer rates applied at Zadoks' growth stages 25 (GS 25) and 30 (GS …
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Evaluation of Novel Techniques to Control Annual Grasses in Intensively Managed Turfgrass Systems
Annual grassy weeds are problematic in intensively managed turfgrass systems due to a lack of selective and affordable control options. Four projects were conducted from 2020-2023 to evaluate novel techniques for Annual bluegrass (Poa annua L.), goosegrass (Eleusine indica L. Gaertn.), and smooth …
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Dry matter estimation and potassium fertilization of intensively managed soft red winter wheat
Dry matter production must be predicted to utilize nitrogen recommendation models for winter wheat at growth stage 30. Four methods of dry matter estimation were evaluated for their ability to predict dry matter production. The pasture probe, height, and rising plate methods did not have adequate …
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An Ecological Assessment of Restoration Efforts Developed to Recover an Intensively Mined Appalachian Watershed
<p>Assessments of watershed-based restoration efforts are rare. Monitoring of projects pre- and post-treatment are essential for the science of stream restoration ecology to advance. We took an experimental approach, following adaptive watershed management principles, to evaluate the effectiveness …
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Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)
Loblolly pine (Pinus taeda L.) occupies 13 million hectares in the United States and represents a critical component of the global carbon (C) cycle. Forest management alters C dynamics, affecting the C sequestration capacity of a site. Identifying drivers that influence C cycling, quantifying C …
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Spatial Activity, Growth, and Population Characteristics of Siren Intermedia in an Intensively Managed Wetland
Most aspects of the ecology of lesser sirens (Siren intermedia) are poorly known. I conducted a mark/recapture study from March 1998-May 1999 at Mingo National Wildlife Refuge (MNWR), Stoddard County, Missouri, to examine spatial activity, growth rates, and population characteristics of lesser …
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Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed
<p>Large scale surface mining in the central Appalachians causes significant alteration of headwater catchments, and these impacts may be offset through implementation of stream restoration projects. As an example, several habitat enhancement structures (cross-vanes and j-hooks) were constructed …
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Survival, Growth, Food Selection, and Alimentary Canal Development of Intensively Reared Walleyes and Yellow Perch
Five genera of invertebrates, collected from a municipal sewage lagoon, were fed to newly hatched larval walleyes, (Stizostedion vitreun vitreun), and yellow perch, (Perca flavescens), to document survival, growth, food selection, and alimentary canal development of these fishes. Mean survival of …
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