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 “"arid rangelands"”.
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Climatic influences on sagebrush establishment in Arid Rangelands: Applications for rangeland rehabilitation.
… it on abandoned mine sites and degraded rangelands. The transition of intact sagebrush ecosystems to ecologically damaged rangelands is especially problematic because it degrades wildlife habitat, reduced biodiversity and potentially alters ecosystem function (Davies and Svejcar 2008). …
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An integrated modelling approach for sustainable management of semi-arid and arid rangelands
… resource management strategies for semi-arid and arid rangelands is acute as non-adapted grazing strategies lead to irreversible environmental problems such as desertification and associated loss of economic support to society. In such vulnerable ecosystems, successful implementation of …
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The Status and Conservation Potential of Carnivores in Semi-Arid Rangelands, Botswana The Ghanzi Farmlands: A Case Study
… in western Botswana are a prime example of semi-arid rangeland where humans, domestic livestock and wildlife live side by side with varying degrees of success. But little research has been conducted in the area into either the wildlife or the white Afrikaner minority who own the majority of the …
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The Effect of Prescribed Burning on Soil Microbial Communities, Nutrients, and Carbon Dioxide Fluxes Under and Between Sagebrush Canopies in the Semi-Arid Rangelands of Northern Nevada
… some of the greatest challenges in western U.S. rangelands. The spread of wildfire has been shown to cause immediate and long-term changes to soil microbial communities, nutrient dynamics, and carbon dioxide (CO2) fluxes. These changes can have direct and indirect effects on soil biochemistry and …
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Quantifying Ungulate-Rangeland Interactions: From Monitoring Free-Roaming Horse Condition to Vegetation Response Following Herbivore Exclusion
… for understanding grazing impacts across arid rangelands. This thesis integrates two complementary studies that address these challenges at different scales. The first develops and validates a quantitative framework for calibrating free-roaming horse body-condition scores from camera-trap …
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Participatory rangeland monitoring and management in the Kalahari, Botswana
… causes and theoretical models in semi-arid rangelands and critically evaluates a range of degradation assessment methods in the semi-arid rangelands of Botswana. This shows that multi-source,multi-scale land degradation assessment can provide more accurate and reliable results than the …
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Participation and indigenous knowledge in development for African pastoralists
Rural development in Africa’s arid rangelands has been exceptionally difficult. Conventional approaches to range and livestock development have consistently failed to meet desired goals, including increased productivity and improved living standards for pastoralists. Perspectives on constraints to …
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Grazing and Climate Effects on High Elevation Meadow Resources
Semi-arid rangelands cover roughly 41% of the Earth’s land surface, and house more than 38% of the human global population. The Greater sage-grouse (Centrocercus urophasianus) has commonly been used as an umbrella species for restoration of sagebrush ecosystems in rangelands, due to its status as …
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Patterns of plant diversity and their management across South African Rangelands
… and disturbance effects across the mesic to semi-arid rangelands east of the escarpment in southern Africa. Results were compared to a well studied North American tallgrass prairie, Konza. Sampled between 1 m2 and 1000 m2 across 25 sites, species and family richness increased with mean annual …
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Non-perennial streamflow & geomorphic patterns in a semi-arid rangeland slated for development
… especially for non-perennial streams in semi-arid rangelands. Non-perennial streams tend to lack a historical baseline with complete records of streamflow presence and absence. A historical pre-development baseline allows for better consideration when making development and infrastructure …
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Impact of lifestock on vegetation and soil nutrients around water points in Highland Savanna rangelands, Namibia
… have significant ecological effects in typically arid and semi-arid rangelands where permanent natural surface water is scarce or absent for provision of livestock farming in dry lands Namibia. The impact of livestock grazing on the vegetation and soil status was studied along a grazing gradient …
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Long-term Vegetation Change Before and After Converting from Livestock farming to Game Ranching in Asante Sana Game Reserve, South Africa
… is widely considered beneficial for semi-arid environments, few studies have reported on the long-term environmental effects of converting from livestock production to game ranching. Asante Sana Game Reserve in the Eastern Cape has centuries old land use history, during which it was …
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Environmental change in Riemvasmaak, Northern Cape, South Africa twenty years after resettlement
… to land restitution and livestock impacts upon arid rangelands hypothesized to be at disequilibrium. As part of a 'black spot' removal program during apartheid, about 1,500 people from Riemvasmaak were forcibly moved off their land in 1974. With many returning to the area in January 1995, …
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Investigations of physiological and competitive relationships of Elymus species related to establishment in the Great Basin, USA.
… Plant selection for effective restoration of arid rangelands should focus on selecting seedlings for establishment under Bromus tectorum pressure and mature plants capable of inducing competitive effect through water acquisition.
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Potential for resource competition between the boodie (Bettongia lesueur) and mala (Lagorchestes hirsutus) in the fenced Matuwa reserve, central Western Australia
… ha predator-free fenced reserve located in the arid rangelands of central Western Australia. Resource overlap between coexisting populations of these two species has not been studied previously, but the literature suggests the potential for considerable dietary overlap. I investigated the degree …
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Effect of pulmonary arterial pressure and precipitation on reproductive performance in Angus heifers in south central Wyoming
… United States where beef cattle are produced are arid rangelands that rely on natural precipitation. In addition, irrigation systems are often contingent on snowmelt. This variable water availability effects forage production and nutrient availability for developing heifers relying on forage …
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Current status and impact (2004-2015) of indigenous ungulate herbivory on the vegetation of Sanbona Wildlife Reserve in the Little Karoo
… processes. This is of particular concern in semi-arid rangelands of the Succulent Karoo where the evolutionary history of grazing is not clear and the compatibility of large herbivores in confined areas remains to be demonstrated. The establishment of Sanbona Wildlife Reserve, a 54 000 hectare …