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 41 for “"Herbaceous species"”.
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Herbaceous species diversity, redundancy and resilience of Mopaneveld across different land-uses
… affect plant diversity and function of the herbaceous layer. This study aimed to quantify the effect of various land-use practices on herbaceous plant community structure, which included productivity (biomass) as well as richness, evenness and diversity at species- and functional level. The …
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The Effects on Soil Fungal Community of Excluding select Above-ground Herbaceous Species in a Montane Longleaf Pine Savanna Restoration Area
… and removal of the dominant plant understory species will result in changes to the relative abundance of fungi communities.<strong></strong></p> <p>I used previous fungi and tree community data, determined ground-cover species dominance, and set up six randomized blocks within the savanna at …
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Vegetation response of a Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) community to 6 mechanical treatments in Rich County, Utah
… ecosystems and associated plant and animal species has been recognized. The historical removal of herbaceous species by excessive and uncontrolled livestock grazing on many of our sagebrush ecosystems has resulted in a stagnant state where dense, competitive stands of sagebrush prevent …
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A comparison of floristic diversity in old-growth versus mid-successional secondary-growth hardwood forests of the White Mountain National Forest, New Hampshire, United States
… whether managed forests will ever regain the species diversity of old-growth stands. While succession and response to disturbance of tree species has been extensively researched, little similar effort has focused on understory herbaceous communities. This study conducted large-scale, …
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Land-use effects on plant biodiversity and carbon cycling in seasonally dry tropical forests in north-eastern Brazil
… as onion and melon being the most common crop species. Here, typical problems such as a high usage of agrochemicals and an improper irrigation, often leading to salinisation of the soils, occur. The present thesis analyses the effect of different land-use practices and intensities on the plant …
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Effects of Air vs. Air+Soil Heating During a Simulated Heat Wave on White Oak (Quercus alba) and Black Oak (Quercus velutina)
… of how abrupt heat-stress affects woody species during heat waves lags behind our knowledge of herbaceous species that have been more widely studied in experimental manipulations. A few studies of herbaceous species also suggest that the coupling of soil heating to air heating can change …
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A Study of the Vegetation of the White River Balds Natural Area, Taney County, Missouri
… in the SMSU herbarium with the raw data. Species composition in four major communities on each of four balds were determined by establishment of 60 permanent nested circular plots in which both woody and herbaceous species were measured. Data was summarized so that community composition …
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Population Dynamics in Response to Fire in <i>Quercus laevis - Pinus palustris</i> Barrens and Related Communities in Southeast Virginia
… removal to that of fire on tree seedling and herbaceous dynamics, and determine the effect of dense lichen (<em>Cladonia spp</em>.) coverage on pine seedling establishment and survival. Fire resulted in 40% aboveground mortality in the overstory, 80% in the sapling/large shrub layer, and …
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Impacts and management of Cenchrus ciliaris (buffel grass) as an invasive species in northern Queensland
… grass is associated with loss of native species and alteration of fire regimes. However there is considerable controversy regarding its weed status as it is also highly valued as a pasture species for arid and semi-arid zones. Quantitative studies are needed to determine its ecological …
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The effect of fire regime on tropical savannas of north-eastern Australia: interpreting floristic patterns through critical life events
The degree to which fire influences plant species composition and abundance (referred to in this thesis as floristic patterns) in Australian tropical savannas has been the subject of debate. Available information emphasises floristic patterns rather than the mechanisms that determine patterns. The …
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The sensitivity of South African plants to acute dosages of sulpher dioxide
… of South African plants. Young trees, shrubs and herbaceous species were used for experiments in which the phytotoxic effects of SOâ‚‚ were studied at different concentrations and exposure times. The plants were fumigated in an exposure chamber at ambient conditions of temperature, light intensity …
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Floristic dynamics of Appalachian pine-oak forests over a prescribed fire chronosequence
… as a result. Percent cover and richness of herbaceous species increased, partly due to the post-fire germination and growth of various forbs and graminoids. Fire did not affect the abundance of exotic invasive species, but its effects on Ailanthus altissima were inconclusive. Low overstory …
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Occurrence, Composition, and Habitat Associations of Terrestrial Herbaceous Plants in a Tropical Forest Community
… a central hypothesis for the maintenance of species diversity. However, all plants require seemingly identical resources, which would appear to limit the number of niche dimensions available for species to inhabit. Woody species continue to be used to characterize the dynamics of tropical …
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Reestablishing Diversity in Our Hardwood Forests: A Transplant Study of Five Spring-Flowering Herbs
Herbaceous communities are critical to the functioning of forest ecosystems. They recycle nutrients, help prevent erosion, provide critical microhabitats and maintain biodiversity. In the eastern United States, most hardwood forests are growing on land once entirely cleared or used for some form of …
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Evidence For Reduced Hawkmoth Pollination in Ruellia Humilis
… may be limiting visitation to native plant species by their natural pollinators, and species adapted to pollination by hawkmoths may be especially susceptible. Allozyme markers were used to estimate the historic and current outcrossing rates of four Missouri populations of self-compatible …
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Herbaceous and woody plant establishment across hydrologic gradients in bottomland reforestation sites
… importance of abiotic factors on tree and herbaceous species establishment and growth, and there is a need for improved tools for identifying critical abiotic factors during pre-restoration planning. In order to determine the effect of hydrology and other abiotic conditions on plant …
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A damming history: an analysis on the legacy effects of beaver dams on the composition and structure of a montane riparian ecosystem
… sites. In contrast, upland, disturbance-adapted species dominated areas of historic beaver activity where dams were not present. Impacts of historic agriculture are still present on the landscape, with higher intensity farming areas dominated by herbaceous species. Finally, the effects of river …
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Nutrient Foraging in Ten Southeast Coastal Plain Plant Species
… nutrient heterogeneity was tested in ten plant species of varying life form and successional status. All plants tested are native to the South Carolina coastal plain. Morphological responses of the root system (scale, precision and discrimination) and overall plant response (sensitivity) to …
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Regeneration Dynamics in Old -Growth and Second-Growth Southern Appalachian Cove Forests
… four contiguous growing seasons. Woody shrub and herbaceous species in the regeneration layer were also investigated. The effects of disturbance and seasonal light availability, as measured by the analysis of hemispherical photographs, were expected to be the major sources of variation explaining …
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