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 213 for “"vegetation cover"”.
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Soil parameter retrieval under vegetation cover using SAR polarimetry
Soil conditions under vegetation cover and their spatial and temporal variations from point to catchment scale are crucial for understanding hydrological processes within the vadose zone, for managing irrigation and consequently maximizing yield by precision farming. Soil moisture and soil …
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Vegetation cover change on Tindfjöll mountains, Iceland, assessed by aerial photographs, topography, and climate
… understand the relationship between climate and vegetation cover, which is playing an important role, as a carbon sink, for biodiversity, and for protecting against natural hazards. Less studied but equally important is to understand how mountain areas are responding to climate warming and how …
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Coupled Behaviour of Soil and Plant Water Dynamics: Effects of Vegetation Cover, Soil Type and Fire Disturbance
… the following primary research question: how do vegetation cover, soil type and fire disturbance interact with and affect soil and plant water dynamics? Each factor in this question will be assessed in an individual chapter. First, I assess vegetation cover using a long-term soil moisture …
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Factors affecting recent vegetation change in north-east Libya
… have led to changes and deterioration in natural vegetation across the world. The Al Jabal Al Akhdar, in north east Libya, is one of those areas that have experienced changes in land cover. This region has environmental and economic importance in providing suitable habitat for wildlife and …
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Effects of Introduced Muskrat Populations on Emergent Vegetation in South Dakota Wetland
… level are the main forces controlling wetland vegetation cover and composition on a long term basis. IN the absence of artificial water control structures, properly managed muskrat populations are the most natural, long term means of regulating wetland vegetation. Reduction of prairie wetlands …
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Monitoring vegetation dynamics in Zhongwei, an arid city of Northwest China
… China to quantify the urbanization and revegetation processes (1990-2011) through a unified sub-pixel measure of vegetation cover. Research strategies included: (1) Conduct sub-pixel vegetation mapping (1990, 1996, 2004, and 2011) with Random Forest (RF) algorithm by integrating high …
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Characterization of dissolved fluvial carbon from landscape characteristics across High Arctic headwater streams
… hydrology (stream length, stream order), vegetation cover, permafrost disturbances, glacier presence, and geology. Landscape drivers of fluvial carbon vary based on the specific sampling location due to the heterogeneity of the High Arctic landscape, although some trends do emerge. …
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Arid land condition assessment and monitoring using mulitspectral and hyperspectral imagery.
Arid lands cover approximately 30% of the earth’s surface. Due to the broadness, remoteness, and harsh condition of these lands, land condition assessment and monitoring using ground-based techniques appear to be limited. Remote sensing imagery with its broad areal coverage, repeatability, cost and …
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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
… by domestic livestock with associated loss in vegetation productivity and subsequent soil erosion. After 1996 game ranching was adopted in the reserve, with observed positive results on vegetation productivity. This thesis investigates the long-term (1987-2017) spatial and temporal change in …
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Fire and Road Disturbance Impacts on Forest Plant Species and Seed Rain in Table Mountain Fire Arai, Kittitas County, Washington
… have altered the plant community’s seed rain and vegetation. This study measured dispersed seeds and understory vegetation cover as functions of roads and fire intensity. Significantly more wind dispersed seeds were collected in high intensity fire sites. The peak in seed release was later and …
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Estimating minimum thresholds of natural vegetation for the integrated management and protection of water quality in South African catchments
… severe socio-ecological consequences. As natural vegetation acts as a sink, thus protecting water resources from diffuse pollution, the preservation of an adequate amount within catchment areas is important. However, among several pertinent questions, it is not clear (1) how much natural …
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INITIAL IMPACTS OF DIFFERENT FERTILIZERS ON IMPROVED EAST TEXAS EQUINE PASTURES
… on improved Bermudagrass (BG) and other vegetation (OTH) in overgrazed equine pastures at the Stephen F. Austin State University Equine Center. Treatments included equine manure (H), broiler poultry litter (P), and a commercial 13-13-13 fertilizer (C), with application rates based on …
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Il ruolo della vegetazione sui processi idrologici di ecosistemi Mediterranei in condizioni idriche limitanti
… In the next step the contrasting influences of vegetation differences (grassland versus mixed ecosystems) and soil differences (deeper alluvial valley soils versus shallow upland soils) on evapotranspiration (ET) and CO2 exchange dynamics have been examined. Data from two representative case …
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Mapping and Assessment of Land Use/Land Cover Using Remote Sensing and GIS in North Kordofan State, Sudan
… Spatial data on dynamics of land use and land cover is scarce and/or almost nonexistent. The study area in the North Kordofan State is located in the centre of Sudan and falls in the Sahelian eco-climatic zone. The region generally yields reasonable harvests of rainfed crops and the grasslands …
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Studies of the establishment of subterranean clover (Trifolium subterraneum L.) and the rate of breakdown of hardseededness
… of sowing, irrigation or no irrigation and vegetation cover (high and low) on the emergence and establishment of subterranean clover, c.v. Mt.Barker, oversown into unimproved pasture was investigated on a Templeton silt loam soil at Lincoln College. With no irrigation, the best establishment …
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Analysis of the diurnal behavior of Evaporative Fraction
… in the middle of the day. The influence of the vegetation cover and the soil moisture conditions on EF diurnal shape was also investigated. We also checked the repercussion of a change in environmental conditions on EF. This study will finally allow a better understanding of EF and suggests some …
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Análise multitemporal e espacial do uso e ocupação do solo no município de Itaporanga-PB.
… Regarding the problem around the loss of native vegetation, this work uses satellite images CCD / CBERS 2 and CBERS 2B (the period of 2005 and 2008), SRTM data associated with data collected in the field to analyze the dynamics of vegetation and use and occupation of the relief provided in the …
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A Remote sensing change detection study in the arid Richtersveld region of South Africa
… technologies in order to investigate possible vegetation cover changes that have taken place over time, and which have manifested through a combination of threats to the region. Te aims of the study were adressed using three key questions that sought to gainan understanding of the relationship …
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Serviços ecossistêmicos de provisão prestados pela caatinga: uma análise do uso e cobertura da terra do município de Acari
… focus on studies on the forms of land use and cover and its ecological processes. Therefore, in an attempt to understand the dynamics of caatinga vegetation cover and ecosystem services, this research has as its spatial focus the municipality of Acari, which, located in the interior of Rio …
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The use of cover crops to increase yield and reduce pest pressure in a commercial avocado orchard at Levubu, Limpopo Province
The study investigated the impact of cover crops (Medicago sativa, Lotus corniculatus, Trifolium pratense, Melilotus alba and Phacelia tanacetifolia), bare soil and natural ground cover on pest and beneficial arthropods, soil health, crop yield, pest damage and weed suppression in avocado orchards. …
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