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 15 of 15 for “"topographic position"”.
-
Morphology and development of the Red Rock Canyon alluvial fan, Clark County, Nevada
… and were ranked in relative age by elevation and topographic position; Because of difficulty in measuring pedogenic carbonate in soils derived from calcareous alluvium, a technique employing macroscopic and microscopic visual determinations, combined with Chittick analyses, was used to estimate …
-
Soil based vegetation productivity modeling for a northern Michigan surface mining region
… % organic matter, soil reactivity, % slope, and topographic position. Five predictive equations based on land use have been developed and are described as an all woody and crop equation, a xeric equation, an equation specific to jack pine, and two semi-wet equations of varying conservativeness. …
-
Vernal Pool Mapping and Geomorphology in the Appalachian Mountains of Pennsylvania
… wind exposure, terrain surface convexity, topographic position index, and a multiresolution index of valley bottom flatness) were used in the suitability model. An analysis of variance (ANOVA) and Tukey's HSD test found a significant difference using the model between terrestrial …
-
Influence of elevation on tree species distribution and growth in the southern Appalachian Mountains
… for the analysis of forest species growth and composition. Past forest vegetation studies focus on species composition and structure for relatively local scale research areas. Species distribution within this geographic area was compiled from studies published from 1956 to 2006. The distribution …
-
Karst water studies and environment in West Malaysia
… environments, determined principally by topographic position and rock purity. Each is distinguished by the nature and depth of soil cover, by the characteristics of the vegetation canopy, and by its meso-relief. Secondly, rapid cycling of nutrients, especially potassium and calcium, takes …
-
Ice storms as a disturbance factor in Appalachian oak forests
… <i>Pinus</i>) appeared unaffected as the composition of tree seedlings remained essentially unchanged after disturbance. Thus, the response of a community to ice damage depends on the interrelated variables of vegetation composition, successional status, and topographic position.
-
Topography, disturbance and climate: subalpine forest change 1972-2013, Rocky Mountain National Park, USA
… Park (RMNP) to investigate changes in species composition and structure and assess species migration during the past 40 years. I specifically considered forest change and migration in the context of topography, disturbance and climate. Data indicate species composition has remained relatively …
-
The Role of Nitrogen Availability, Hydroperiod and Litter Quality in Root Decomposition Along a Barrier Island Chronosequence
<p>The decomposition of organic matter regulates carbon and nutrient flux between biotic and abiotic pools. Traditional research emphasizes above ground decomposition processes and, by inference, extends these findings to below ground systems. The study, conducted along a southeastern Atlantic …
-
Plant Successional Patterns at Sperry Glacier Foreland, Glacier National Park, MT, USA
… Shannon's diversity, species evenness, composition, and species turnover) over a 170-year chronosequence, and (2.) vegetative trends over field and GIS-derived site conditions (e.g., surface fragmentation, concavity, flow accumulation, and solar irradiance). Sixty-one plots (each 8 square …
-
Compression wood formation in Pinus strobus L. following ice storm damage in southwestern Virginia
… was quantified using image analysis software. Topographic data (slope, aspect, and elevation) were also recorded for each P. strobus tree, along with a modified competition index. Wood anatomical features were also quantified in the three years before and after the storm along a tree diameter …
-
The role of life history traits for coexistence and forest recovery after disturbance – a modelling perspective. Towards a better understanding of species-rich forests
… evolved, manifesting itself also in different compositions of life history traits in trees. This thesis investigates the role of tree life history traits (growth, mortality and recruitment) on different processes structuring species-rich forests. Our study system is a montane rainforest located in …
-
Enhancement of digital elevation models using tree-based ensemble machine learning algorithms
… practices on spatial data infrastructure and topographic map revision. Thus, global digital elevation models (DEMs) have gained worldwide prominence due to their free availability; a prime advantage when compared to prohibitively expensive airborne topographic surveys. However, the accuracies …
-
Biogeochemical Investigations in Old Growth and Disturbed Forest Sites at Mount Kilimanjaro
… for this was probably a combination of the topographic position of the secondary forest sites and the forest fragmentation. Since the secondary forest sites and the clearings had higher sand contents, the water holding capacity of these sites was lower than in the mature forest. With the …
-
Determining the potential drivers of invasive C4 grasses at De Hoop Nature Reserve, South Africa
… designed to examine the extent to which topographic position along a slope (moisture availability), an increase in nutrient availability and a decrease in competition for resources influences the establishment and growth of C4 grass. To do this I transplanted tufts of Setaria sphacelata …
-
Temporal, Spatial, and Environmental Influences on the Demographics and Harvest Vulnerability of American Black Bears (Ursus americanus ) in Urban Habitats in New Jersey, Pennsylvania and West Virginia
… distance to urban areas was between 1-5 km, (3) topographic position index was >100 (steep, rugged terrain), (4) land use land cover was forested or "other", (5) distance to roads was >1.4 km, and (6) distance to core forest was >1.5 km. We found no support for our prediction that urban bears use …