Field and laboratory investigations were conducted relating to factors controlling distribution and abundance of annual species growing in a deisturbed portion of the salt desert shrub zone on fine-textured soils. Dominant species on the site in the two study years were the nonnative, Halophytic, late-summer maturing, Halogeton glomeratus (Bieb.) C.A. Mey., and Bassia hyssopifolia (Pall.) Kuntze. Contrasting amounts of precipitation were received in the two years; in 1974, spring conditions were so dry that two early-maturing, sub-dominant annuals, Descurainia pinnata (walt.) Britton, and Lepidium perfoliatum L. were essentially absent. They successfully reproduced under more favorable 1975 conditions. Studies on species distribution centered around factors responsible for occurrence of large (20-30m across), adjacent, essentially pure stands of Bassia and Halogeton. It was determined that few seeds dispersed more than a couple of meters from parent plants; and that seedling establishment success of the species was significantly different in the two vegetation types, commensurate with soil surface physical and chemical differences. The less drought tolerant Bassia was confined to soils which had higher water potential in summer than the areas occupied by the succulent halogeton. Bassia responded with more rapid growth when water availability increased, and suppressed halogeton in both growth chamber competition studies. The adjacent pure communities are believed to be maintained by Bassia's inability to establish on soils dominated by Halogeton, and Bassia's competitive superiority when both species become established together. Studies on plant abundance involved making quantitative estimates of numbers of seeds or plants per unit area in different life cycle phases during the study period. The objective of these studies was to determine the manner in which each year's seed production was utilized, in terms of dormancy of seeds in soil, germination, mortality, or reproduction. It was determined that residence time of seeds in soil was short, since seeds germinated freely after overwintering. Consequently the vegetation composition was closely related to the previous year's seed production. Tremendous mortality occurs during the seedling establishment phase, as only eight percent of seeds sown into marked quadrants survived until mid May. Mortality during summer was highly density-dependent. Plant plasticity served a homeostatic function on one site which suffered a seed crop failure in 1974. The few plants established there in 1975 became very large so that total seed production was not greatly different from areas which had a substantial amount of seed production in 1974.

Call number: LD2668 .T4 1985 G672 / Master of Science

Agriculture has an important role in Turkey / hence automated approaches are crucial to maintain sustainability of agricultural activities. The objective of this research is to classify eight crop types cultivated in Karacabey Plain located in the north-west of Turkey using multi-temporal Kompsat-2 and Envisat ASAR satellite data. To fulfill this objective, first, the fused Kompsat-2 images were segmented separately to define homogenous agricultural patches. The segmentation results were evaluated using multiple goodness measures to find the optimum segments. Next, multispectral single-date Kompsat-2 images with the Envisat ASAR data were classified by MLC and SVMs algorithms. To combine the thematic information of the multi-temporal data set, probability maps were generated for each classification result and the accuracies of the thematic maps were then evaluated using segment-based manner. The results indicated that the segment-based approach based on the SVMs method using the multispectral Kompsat-2 and Envisat ASAR data provided the best classification accuracies. The combined thematic maps of June-August and June-July-August provided the highest overall accuracy and kappa value around 92% and 0.90, respectively, which was 4% better than the highest result computed with the MLC method. The produced thematic maps were also evaluated based on field-based manner and the analysis revealed that the classification performances are directly proportional to the size of the agricultural fields.

ABSTRACT DECISION TREE CLASSIFICATION OF MULTI-TEMPORAL IMAGES FOR FIELD-BASED CROP MAPPING Sencan, Se&ccedil / il M. Sc., Department of Geodetic and Geographic Information Technologies Supervisor: Assist. Prof. Dr. Mustafa T&uuml / rker August 2004, 125 pages A decision tree (DT) classification approach was used to identify summer (August) crop types in an agricultural area near Karacabey (Bursa), Turkey from multi-temporal images. For the analysis, Landsat 7 ETM+ images acquired in May, July, and August 2000 were used. In addition to the original bands, NDVI, PCA, and Tasselled Cap Transformation bands were also generated and included in the classification procedure. Initially, the images were classified on a per-pixel basis using the multi-temporal masking technique together with the DT approach. Then, the classified outputs were applied a field-based analysis and the class labels of the fields were directly entered into the Geographical Information System (GIS) database. The results were compared with the classified outputs of the three dates of imagery generated using a traditional maximum likelihood (ML) algorithm. It was observed that the proposed approach provided significantly higher overall accuracies for the May and August images, for which the number of classes were low. In May and July, the DT approach produced the classification accuracies of 91.10% and 66.15% while the ML classifier produced 84.38% and 63.55%, respectively. However, in August nearly the similar overall accuracies were obtained for the ML (70.82%) and DT (69.14%) approaches. It was also observed that the use of additional bands for the proposed technique improved the separability of the sugar beet, tomato, pea, pepper, and rice classes.

"Image and Text" focuses on the consequences of multi-media interaction on the concept of a work's meaning(s) in three distinct publishing trends in nineteenth-century Britain: graphic satire, the literary annuals, and book illustration. The graphic satire of engravers James Gillray and George Cruikshank is replete with textual components that rely on the interaction of media for the overall satirical impact. Literary annuals combine engravings with the ekphrastic poetry of writers including William Wordsworth, Samuel Taylor Coleridge, Robert Southey, and Letitia Elizabeth Landon. Book illustrations provided writers Sir Walter Scott and Alfred, Lord Tennyson a means to recycle previously published works as "new" texts; the engravings promote an illusion of textual originality and reality by imparting visual meanings onto the text. In turn, the close proximity of text to image changes visual meanings by making the images susceptible to textual meanings. Many of the theoretical implications resulting from the pairing of media resound in modern film adaptations, which often provide commentary about nineteenth-century visual culture and the self-reflexivity of media. The critical heritage that has responded to the pairing of media in nineteenth-century print culture often expresses uneasiness with the relationship between text and mechanically produced images, and this uneasiness has often resulted in the treatment of text and image as separate components of multi-media works. "Image and Text" recovers the dialogue between media in nineteenth-century print forms often overlooked in critical commentary that favors the study of an elusive and sometimes fictional concept of an original work; each chapter acknowledges the collaborative nature of the production of multi-media works and their ability to promote textual newness, originality (or the illusion of originality), and (un)reality. Multi-media works challenge critical conventions regarding artistic and authorial originality, and they enter into battles over fidelity of meaning. By recognizing multi-media works as part of a diverse genre it becomes possible to expand critical dialogue about such works past fidelity studies. Text and image cannot faithfully represent the other; what they can do is engage in dialogue: with each other, with their historical and cultural moments, and with their successors and predecessors.

No description available.

Bibliography: p. [i.e. leaves] 267-277 / 277 p. [i.e. leaves], [4] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, 1986

Commercial AM fungi isolates, Rhizophagus clarus, Gigaspora gigantea, Funneliformis mosseae, Claroideoglomus etunicatum and Paraglomus occulum were tested on four seasonal ornamentals, Dianthus chinensis x barbatus, Impatiens wallerana, Petunia x hybrid and Viola x wittrockiana planted in peat-base medium. The experiment was conducted in a glasshouse with three replicates in a completely randomised design. Various vegetative (height, width, length, number of leaves, leaf area and dry biomass) and reproductive (number of flowers and buds) plant parts were measured in the course of three months. AM fungi was found to increase seedling growth and reduced seedling mortality rate of all the plants studied. Inoculated plants produced more leaves (16-33%) and grew taller (12-28%). Dry biomass of inoculated Dianthus, Impatiens and Viola plants were significantly increased by 25-53%. All plants under low colonisation rates displayed mycotrophic qualities and net growth output thereof were found to be similar to plants with equal or higher colonisation rate. Mortality were less frequent in inoculated plants and they were also less susceptible to transplant shock. / Agriculture, Animal Health and Human Ecology / M. Sc. (Ornamental Horticulture)

Disturbance is one of most important selective factor causing removal of plant biomass. Man-made habitats are characterized by strong and unpredictable disturbances, providing bare soil surface colonized by plants with short life cycle. Populations of the short-lived plants are, however, vulnerable to the strong disturbance removing all stem parts with reserve axillary meristems in the case it occurs before plant flowering and fruiting. Nevertheless, 2 % of annual and 14 % of biennial plants are able to overcome meristem limitation by adventititous sprouting from hypocotyle or/and roots. This thesis is composed of four original studies describing the occurrence of adventitious sprouting in natural populations of 22 monocarpic weeds of Central Europe and one species in Indonesia. The studied phenomenon was analyzed in relation to various environmental factors and plant traits in the field and in experimental conditions.