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.
Results
Showing 1 to 20 of 114 for “"vegetation type"”.
-
Vegetation change and vegetation type stability in the Cape of Good Hope Nature Reserve 1966 - 2010
Vegetation stability was investigated within the Cape of Good Hope Nature Reserve by incorporating three vegetation surveys spanning a 44 year time period. The goals of this study were to investigate changes in overall species diversity within the reserve, stability of community composition within …
-
Determination of Habitat Preferences of Pronghorn (Antilocapra americana) on the Rolling Plains of Texas Using GIS and Remote Sensing
… by a variety of fences to determine how fence types affected habitat selection. Habitat parameters chosen for analysis were vegetation, elevation, slope, aspect, and distances to water, roads, and oil wells. Results showed that pronghorn on the ranch crossed modified fencing significantly less …
-
Shrub expansion in the low Arctic: The influence of snow and vegetation feedbacks on nitrogen cycling
… shrub species in the Arctic. Increased deciduous vegetation in the tundra could have profound implications on regional climate, carbon balance, and biogeochemical cycling of nutrients. Winter biological processes may be a mechanism explaining shrub expansion in the Arctic. Tall shrubs accumulate …
-
An Assessment of Habitat Suitability for Pronghorn Populations of the Central Valley Region of California
… areas in the model. Model variables included vegetation type (forest, shrub, grassland, semi-desert scrub, crops, and bare areas), slope, and road density. Vegetation and road density variables were treated categorically and slope as a continuous variable. Kernel density estimation (KDE) was …
-
Ecosystem level impacts of annual and perennial N2-fixing invasive alien plants in the fynbos vegetation of South Africa
… and community functioning within the fynbos vegetation type. This study investigated changes in fynbos N cycling regimes with the invasion of two different N2-fixing invasive alien plants, Acacia saligna and Lupinus luteus.
-
The Peninsula Shale Renosterveld of Devil's Peak: phytosociology, system drivers and restoration potential
… is a poorly understood and critically threatened vegetation type with 87% of its original extent transformed and the remaining fragments restricted to the area surrounding the Cape Town city bowl. A substantial portion of Peninsula Shale Renosterveld is situated in the Groote Schuur Estate, …
-
An analysis of vegetation pattern and its relationship to NDVI data in the Namaqualand area, South Africa
… in influencing the phenology and growth of the vegetation in the area. Remote sensing techniques were used to reveal the vegetation patterns in the greater Namaqualand area and to relate them to climatic variables. To do this we used the normalised difference vegetation index (NDVI) to relate …
-
Pastoral mobility in a variable and spatially constrained South African environment
… This thesis also investigated the role of vegetation type and condition in the distribution of grazing pressure and further discussed the implications of using variable stocking rates in a spatially constrained pastoral system.
-
THE INFLUENCE OF ENVIRONMENTAL VARIABLES ON PREDICTING RARE-PLANT HABITAT IN THE NEZ PERCE NATIONAL FOREST
… the models ranked elevation, May precipitation, vegetation type, April minimum temperature, NDMI, September precipitation, and July maximum temperature as highly important for Broad-fruit mariposa. Vegetation type, NDMI and NDVI tended to be ranked highest when modeled at the 30×30 m resolution, …
-
THE INFLUENCE OF ENVIRONMENTAL VARIABLES ON PREDICTING RARE-PLANT HABITAT IN THE NEZ PERCE NATIONAL FOREST
… the models ranked elevation, May precipitation, vegetation type, April minimum temperature, NDMI, September precipitation, and July maximum temperature as highly important for Broad-fruit mariposa. Vegetation type, NDMI and NDVI tended to be ranked highest when modeled at the 30×30 m resolution, …
-
Soil Respiration and Related Abiotic and Remotely Sensed Variables in Different Overstories and Understories in a High Elevation Southern Appalachian Forest
… of Rs under a natural hardwood system. The four vegetation types under consideration were an eastern hemlock (Tsuga canadensis L. Carriere) dominated overstory, a hardwood overstory with little to no understory, a mountain laurel (Kalmia latifolia L.) dominated understory, and a cinnamon fern …
-
Bryophyte diversity patterns in a fragmented landscape : a case study of South African West Coast renosterveld
… on bryophyte diversity in renosterveld vegetation of South Africa's west coast. The main objectives of this study are to; Document bryophyte species assemblages in remnant fragments of renosterveld vegetation, investigate the effect of fragment size, isolation and heterogeneity on …
-
Palynology of the Cape's top ten richest families and its taxonomic implications
… at higher taxonomic levels (including aperture type, exine structure, pollen-unit, polarity, symmetry, shape), and their evolutionary trends are examined. Monocotyledons differ from eu-dicotyledons (and eu-dicots from basal-dicots) in their aperture number and form, and exine structure and are …
-
The influences of hydrology and vegetation on emergent insect and benthic macroinvertebrate communities across space and time in seasonally inundated, geographically isolated wetlands
… emergent aquatic insects, respond to vegetation and differences in long-term patterns of water permanency in isolated wetlands is unknown. To understand the influences of vegetation type and historical hydrology in isolated wetlands, we investigated benthic and emergent …
-
Assessing intra-seasonal land surface change and long term trends in the succulent Karoo biome using coarse resolution satellite and interpolated rainfall surfaces
… it is predominantly recognized as a west coast vegetation type its borders stretch as far east as Steytlerville in the Little Karoo. The area contains the largest number of endemic succulent species in the world and harbors nearly 10 percent of the of the total number of succulent species …
-
Impacts of degradation on critically endangered Oudtshoorn Gannaveld
In the Succulent Karoo biome of South Africa vegetation degradation by overgrazing is a recognized threat to biodiversity. In the eastern Little Karoo region of the Western Cape Province, ostrich farming has degraded large areas of natural vegetation, particularly in the Gannaveld habitat of the …
-
The effects of fragmentation of South Coast Renosterveld on vegetation patterns and processe
… investigates the effects of fragmentation on vegetation patterns and processes of South Coast Renosterveld at three hierarchical levels. South Coast Renosterveld is a grassy shrubland derived from shales on the coastal forelands of the Western Cape Province, South Africa. The area forms part …
-
Pattern and process in South Coast dune fynbos : population, community and landscape level studies
The study aimed to explain vegetation dynamics in response to disturbance in a dune landscape comprising a mosaic and admixture of grassland, fynbos and thicket. A hierarchical approach directed investigations at the landscape, community and population levels, with emphasis on seed banks. The study …
-
Aspects of the revegetation of mountain fynbos vegetation of the south western Cape, South Africa
The revegetation of severely, disturbed areas using indigenous vegetation forms the topic of this thesis. Mountain Fynbos was chosen for the study because of its importance as a unique vegetation-type worthy of conservation. Unfortunately, this vegetation faces long-term threats associated with …
-
Effect of invasive phragmites australis and its control on microbial community composition in a freshwater wetland
… DNA from soils dominated by Typha and Phragmites vegetation preceding and following herbicide application. Soil bacterial communities differed by vegetation type and indicated both seasonal and inter-annual effects. Bacterial diversity was greater in Typha soils that had more plant diversity (p < …
Page 1 of 6