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 77 for “"Semi-arid regions"”.
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The role of rooting strategies on the eco-hydrology of semi-arid regions
Arid regions are characterized by high variability in the arrival of rainfall, and species found in these areas have adapted mechanisms to ensure the capture of this scarce resource. In particular, the rooting strategies employed by vegetation can be critical to their survival. However, land …
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A multi-criteria evaluation of land-surface models and application to semi-arid regions
… type). To better understand SVATS performance in semi-arid regions, and to evaluate the various impacts of data on the parameter estimation problem, an intensive calibration and validation study is undertaken. Findings show that calibrated parameters result in improved performance over default, …
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A mathematical model of browse and herbage production in communal grazing lands of semi-arid regions
… of growing cattle and grass production in a semi-arid rangeland.The existing model which is basically Dye's (1983) model in differential equation form handles: i) the growth and performance of cattle measured in terms of weight, ii) the initiation of grass growth in early rainy season and its …
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Assessing the salinity effects and economic feasibility of on-farm desalination technology in irrigated semi-arid regions
… practices can inhibit agricultural productivity. Semi-arid regions where irrigation is used to support crop growth are particularly impacted by the quality of surface and groundwater sources. In this study, we use a combined numerical modeling and economic analysis approach to estimate the …
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The Potential of Watershed Development for Enhancing Agricultural Livelihood: Three Essays from the Semi-arid Regions of India
… capacity of the, otherwise, rainfed agricultural regions. Irrigation capacity is built via the adoption of various soil and water conservation measures, which then facilitate recharge of groundwater tables within an identified micro-watershed (typically consisting of one or two village …
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The value of Mopane worms: quantifying ecosystem services in terms of nutrient cycling in semi-arid regions of Limpopo
Mopane worms are the late-instar stage caterpillars of the mopane moth, Imbrasia belina/ Gonimbrasia belina, found in southern Africa virtually following their hosts' trees, Colophospermum mopane, Terminalia seriscea, and Sclerocarya birrea, among others. The caterpillars are harvested for …
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Human-Plant Interactions in Semi-Arid Regions: An Archaeobotanical Study of the Iron Age Site of Mtanye, Southwestern Zimbabwe
… likely underpinned their ability to survive in a semi-arid environment for a prolonged time.
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Biosphere-atmosphere interactions over semi-arid regions : modeling the role of mineral aerosols and irrigation in the regional climate system
… the role of land surface processes in shaping semi-arid climates, namely those of Southwest Asia and Northwest Africa. The interactions between dust emissions, irrigation, and climate processes are studied and quantified using a regional climate model to perform a series of carefully designed …
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Leveraging improved seed technology, migration and climate information for building the adaptive capacity and resilience to climate risks in semi-arid regions
… in the farming communities residing in semiarid lands. These include the use of adaptive seed technology, migration as a livelihood diversification and adaptive strategy, and the use of climate information in farm decision-making. The second chapter evaluates the impact of improved …
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The use of remote sensing and GIS for water resources management in large semi-arid regions: A case study of the Lake Chad Basin, Africa.
… the management of the water resources in large semi-arid regions. In the Lake Chad Basin, Africa, it is demonstrated how remotely sensed data can contribute significantly to a groundwater problem, something which historically has not often been achieved, particularly in semi-arid …
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CENÁRIO DA AGRICULTURA ORGÂNICA NO SEMIARIDO BRASILEIRO
… challenges for organic production, especially in semi-arid regions, where information does not always reach producers. Thus, this paper aims to present a characterization of family and organic agriculture in the Brazilian Semi - arid, identifying among the units of the federation those that …
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Holocene vegetation and palaeoenvironments of the Southern Cederberg mountains of South Africa : palynological evidence from fossil hyrax (Procavia) dung middens
… are relatively easy to reconstruct in humid regions as polled traps (swamps and peat bogs) there are usually abundant. However arid and semi-arid regions (such as southern Africa) lack fossil pollen because of the scarcity of pollen preserving bodies. This attribute results in difficulties in …
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Extraction, isolation and structural determination of organic compounds from Scaevola spinescens R.Br. / by Sally Felstead Nobbs.
… an Australian native plant, found widely in the arid to semi-arid regions of South Australia and through into most other states. Aboriginal people of Hawker in South Australia have traditionally used it as a natural medicine to treat a variety of symptoms. The thesis aims to extract, isolate and …
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Untangling clumps-factors influencing seedling ecology in a semi-desert, and the implications for restoration ecology
… dynamics are two common ecological processes in semi-arid regions. I tested the relevance of these processes to seedling establishment of perennial species on degraded landscapes in Namaqualand, South Africa. The species were grouped into two functional guilds, Mesembryanthema (formerly the …
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Pedogenic gypsum of southern New Mexico: Genesis, morphology, and stable isotopic signature
… soil morphology of pedogenic gypsum in and to semi-arid regions and (2) determine the applicability of pedogenic gypsum as a paleoclimatic indicator; Six profiles containing soils of late Pleistocene through Holocene age in the Tularosa and Jornada basins of Southern New Mexico were described …
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The impacts of indigenous herbivore grazing over five years (2004 - 2008) on vegetation dynamics in four distinct vegetation types of the winter-rainfall Little Karoo
Vegetation in semi-arid regions is subject to change when heavily utilised by herbivores. Changes in species richness, species and growth form composition, total cover and plant palatability in response to rest (fenced) and grazing (open) treatments was investigated in Sanbona Wildlife Reserve over …
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Environmental influences on moult and movement strategies in southern African waterfowl
… annual life history events in north-temperate regions are driven primarily by predictable seasonal variations in temperature. In contrast, the spatio-temporal availability of adequate resources to waterfowl in the semi-arid regions of southern Africa is determined by rainfall which is extremely …
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Geomorphic modeling and routing improvements for GIS-based watershed assessment in arid regions.
… their application to management problems in arid and semi-arid regions. The first is that the performance of event-based hydrologic models for ephemeral stream networks declines significantly as watershed size increases. The second is that no single model is capable of simulating runoff, …
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Community specialisation, standardisation and exchange in a hunter-gatherer society: a case study from Kalkadoon country, northwest Queensland, Australia
… Lake Moondarra, a major stone axe quarry in the semi-arid regions of northwest Queensland. At the time of contact with white settlers, the Kalkadoons, Aboriginal people from northwest Queensland participated in an expansive exchange network that spanned the continent from north to south (McCarthy …
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