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 38 for “"Perennial species"”.
-
Isozyme and RFLP Studies in the Genus Glycine Willd. Subgenus Glycine
… Willd. subgenus Glycine consists of 12 wild perennial species which are native to parts of Australia, South China and adjacent islands in the west and south Pacific. This thesis investigated the variation and biosystematic patterns in the subgenus Glycine utilizing isozyme and RFLP analyses. …
-
Lignin and carbon transformation in roots of maize and mixed perennial biofuel crops
<p>Perennial species are being explored as biofuel crops alternative to maize. In this study, fertilized and unfertilized mixed perennial prairie crops were compared with a conventional maize-soybean rotation and to continuous maize cropping systems to assess the potential production of above- and …
-
Untangling clumps-factors influencing seedling ecology in a semi-desert, and the implications for restoration ecology
… of these processes to seedling establishment of perennial species on degraded landscapes in Namaqualand, South Africa. The species were grouped into two functional guilds, Mesembryanthema (formerly the family Mesembryanthemaceae, but now part of the Aicoaceae; hereafter Mesemb), which rely on CAM …
-
Development and Application of Vegetation-Based Biomonitoring Criteria for Floodplain Wetlands
… Macrophyte communities were characterized by species canopy cover and frequency. Fifty-three wetlands were sampled over the 2-year period (22 temporary and 31 seasonal wetlands). Wetlands were categorized as reference ("least'' impaired) or impaired sites based on local land-use …
-
Vegetation management effects on fruit trees
… applied alone. The control of annual weed species was excellent with several treatments, but the use of certain herbicides appeared to release a number of perennial species. Consequently, season long control was often not achieved. There were few initiations of any herbicide injury to the …
-
Investigating Root Storage and Exudation in the Brachypodium Genus
… the difference of exudation between annual and perennial species and compare the levels of carbon storage in roots that arise from shoot apical meristems or from root apical meristems. These two functions occur in response to surplus carbon content in a plant, which we artificially prompted by …
-
The Effects of Gibberellic Acid, Smoke Water, and Cold Stratification on the Germination of Asclepias and Liatris Seeds
… challenge in the propagation of many native perennial species, including members of the <em>Asclepias</em> and <em>Liatris</em> genera. This study evaluated the effects of cold stratification and chemical treatments on the germination performance of six <em>Liatris</em> species and five …
-
Approaches to wildflower meadow establishment
… establishment using native Virginia herbaceous perennial species were investigated. The initial task lay in identifying the truly native species from those European introductions which have successfully naturalized in the state. Germination testing was conducted in accordance with procedures …
-
Isolation and detection of bean yellow mosaic, clover yellow vein and peanut stunt viruses from Trifolium L. species
Trifolium L. (clover) are annual or perennial species established in pasturelands to improve forage productivity and quality. In the southeastern United States, Trifolium repens L. (white clover) and Trifolium pratense L. (red clover) are important species, susceptible to virus infection. …
-
Populations studies on two endemic taxa of southwestern Sardinia: Dianthus morisianus Vals. (Caryophyllaceae) and Anchusa littorea Moris (Boraginaceae)
… Anchusa littorea Moris is a short-lived species of open dunes and D. morisianus is a perennial species which grows on stabilized dunes. The only natural populations of these species are located in southwest Sardinia. Like many other rare species of this type of habitat we know little of …
-
Demographic and environmental determinants of reproductive success in Synthyris bullii, a rare endemic species
… reproductive ecology of Synthyris bullii, a rare perennial species endemic to North American prairies and savannas. In Chapter 1, I explore the relationship between reproductive success and floral quantity versus quality. The results of this study show that inflorescence size correlates positively …
-
Species and functional diversity effects on productivity and nutrient uptake: implications for designing sustainable agricultural systems in the Midwest
… on aboveground biomass and nutrient uptake by species and functionally diverse native perennial plant species and communities is needed to enhance the performance of in-field buffer conservation practices. Comparisons on the performance of monocultures and polycultures of four native perennial …
-
Systems Analysis of Plant Responses to Drought
… We study two genotypes of the model grass species Brachypodium distachyon, leveraging natural variation and RNA-sequencing to study their responses to drought stress. (2) Natural perturbations can be used to understand complex traits. In wild species, limited resources drive allocation …
-
A comparative study of the population dynamics of four Amaranthaceae species
… japonica and Iresine rhizomatosa are two perennial species in the same family as A. palmeri and A. tuberculatus that occur in similar habitats as one another, but differ in invasiveness. Achyranthes japonica is a non-native, invasive species that is becoming a threat to forested areas and …
-
Investigations of Bromus tectorum: restoration strategies and interactions with arbuscular mycorrhizal fungi
… weeds in the United States, reduces native species diversity and transforms habitats. I conducted four experiments designed to better understand B. tectorum ecology and evaluate control and restoration strategies. I measured the responsiveness of six native plants and B. tectorum to field …
-
Effect of land degradation on the above-ground vegetation and soil seed bank of a Rangeland in Kunene region Namibia
… were sampled along each transect. Woody plant species were identified and counted in a 20 x 20 m quadrat, while herbaceous plants were assessed in a 1 m2 quadrant, nested within the larger quadrat. Soil cores samplers measuring 9.7 cm in diameter and 5 cm in depth were obtained using a soil …
-
The phenology of an enclosed pasture area with specific reference to the soil-vegetation interface
… rather than the precise responses of individual species to environmental variations. Feeding experiments with fauna in the laboratory have helped to add to the knowledge of the trophic position of some New Zealand species. The results of the survey show the effects of floral competition where …
-
The implications of improving the conservation value of field margins on crop production
… second. Communities of herbaceous field margin species were established, and the effects of nitrogen fertiliser and sublethal glyphosate application were examined over two years. Cover abundance of grasses was greater than that of dicotyledonous species throughout. Bromus sterilis was the most …
-
Foliar Symptoms of Acute Ozone Injury and Exposure Response Characteristics of Select Native Perennials
<p>Twenty seven perennial species native to the Eastern Temperate Forests Level I Ecoregion were exposed to an acute ozone (O3) treatment consisting of a target peak O3 concentration of 2.0 ppm for 30 minutes in a closed chamber environment, during the summer of 2010. Plants were evaluated for …
Page 1 of 2