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 17 of 17 for “"land use history"”.
-
Effects of Land-Use History on Soil Macro- and Trace Elements in the Southern Piedmont of North America
<p>Land use histories affect the rate and pattern of soil nutrients at regional and global scale. However, former studies have rarely focused on soil trace elements (B, Mn, Zn, Cu and Fe). In this study, we aimed at the long-term biogeochemical cycling pattern and spatial heterogeneity of soil …
-
Conservation Genetics of Narrowly Distributed Annual, <em>Erythranthe discolor </em>(Phrymaceae), in the Southern Sierra Nevada
… Forest. The Piute Mountains has a varied land use history which includes off-highway vehicle (OHV) use, mining, logging, and residential development which has facilitated a network of roads and created opportunities for non-native plant invasion. These factors can alter the delicate …
-
An Analysis of Base-Level Conduit Sedimentation in South Central Kentucky
… and variations in surface changes, including land-use. Samples were collected using coring tubes to preserve the structure within the sediment. The structure was documented visually, recording distinct changes in the layering. The textural variations were determined through sieving samples at …
-
Human Impacts on Fire in De Soto National Forest, Mississippi, U.S.A.
… the Southeast United States. Prescribed fire is used to manage these threatened ecosystems, but information regarding historical fire activity is unknown. My goals were to determine the historical fire regimes in De Soto National Forest (DSNF), southern Mississippi, and determine the influence of …
-
The response of dune vegetation to human trampling and grazing
The land use history of a South Wales dune system, Merthyr Mawr Warren is described with reference to the present recreational use.<br/><br/>Periodic trampling and wear by motor cycle was applied to previously undamaged vegetation and the effect monitored quantitatively over three seasons. …
-
Plant-Soil Feedback and Perennial Forage Systems
… multi-year field trial with a controlled greenhouse PSF experiment to evaluate how harvest frequency and community composition influence native species performance and soil microbiome composition. Field plots, including monocultures and mixtures of seven forage species, were harvested once or …
-
How has woody vegetation changed in north-east Namibia in response to land use, climate and fire?
… Park (BNP) in north-east Namibia. With a complex land use history and different fire management approaches being adopted throughout the area, the effect of fire on woody vegetation in BNP is currently poorly understood. This study used a 20-year-old repeat photography monitoring project and …
-
Assessing the Impacts of Balsam Woolly Adelgid (Adelges Piceae Ratz.) and Anthropogenic Disturbance on the Stand Structure and Mortality of Fraser Fir (Abies Fraseri (Pursh) Poir.) in the Black Mountains, North Carolina
… in Fraser fir is particularly concern because it serves as a foundation species within the spruce-fir forests of the Southern Appalachian Mountains. Our objectives for this research were to 1) use current stand structure to infer whether Fraser fir trees are experiencing a cycle of …
-
Long-term Vegetation Change Before and After Converting from Livestock farming to Game Ranching in Asante Sana Game Reserve, South Africa
… Reserve in the Eastern Cape has centuries old land use history, during which it was cultivated and heavily overgrazed 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 …
-
Palaeoecology and vegetation dynamics in the Cederberg wilderness area
… The area has been subject to various forms of land use for millennia ranging from hunter-gatherers, herders, and farmers to visitors today. This study used palaeoecological techniques to investigate the impacts of past land use, specifically the transition from hunter-gathering to farming and …
-
The Peninsula Shale Renosterveld of Devil's Peak: phytosociology, system drivers and restoration potential
… the Table Mountain National Park. Due to a history of diverse land-use impacts, what remains today is a complex mosaic of alien invasive species and indigenous vegetation in various states of degradation. As a result of the substantial transformation, it is evident that to improve the …
-
Veränderung von Waldökosystemen aufgrund historischer Nutzung im Schwarzwald und in den Vogesen
… untersuchen und aufzuzeigen, wie die ehemalige Landnutzung diese Bodenparameter verändert sowie auf die Artenzusammensetzung und die Struktur der Waldbestände eingewirkt hat. <br>Hierfür wurden in fünf Untersuchungsgebieten im Schwarzwald und in den Vogesen insgesamt 33 bewaldete Standorte …
-
Attribution of the risk of extreme flood events to climate change in the context of changing land use and cover: case study of the shire river basin flood of 2015
… given the nature of hydrological events and the land use history of the basin, land use and cover change is another potential flood risk factor which, if overlooked, might affect conclusions with regards to the contribution of external factors to the risk of flooding. To account for both climate …
-
Plant community assembly and biodiversity: a spatio-temporal perspective
… were characterized in semi-natural grasslands (in plots of 0.5 × 0.5 and 2 × 2 m, and whole grassland polygons). The extent to which the present-day and historical characteristics of the sites and their surrounding landscape explain the current diversity patterns was quantified. Temporal …
-
Nutrient fluxes and soil microbial processes
Because of previous intense forest use and over exploitation in the past centuries, the plantation of coniferous stands, especially Norway spruce (Picea abies L. KARST.) with high production potentials has been a common European afforestation strategy. However, the characteristics of Norway spruce …
-
Patterns of plant species richness and diversity across two habitat types in the Upper Karoo, South Africa
… biodiversity. Apart from its rich agricultural land-use history, the region is also under pressure from the development of the Square Kilometre Array, an increased demand for cleaner energy from shale gas fracking and/or other renewable energy installations, and the overarching impacts of global …
-
Data-driven spatial modeling of historic and future land change at global scale
Assessing the historic and future impacts of land-use and land-cover change (LULCC) on climate requires spatially and temporally explicit data sets on LULCC spanning several decades to centuries, because climate change is a long-term problem. Though remote sensing data provides a globally …