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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Agricultural and societal perspectives on pasture-based livestock production systems in Germany

Schaak, Henning 30 April 2019 (has links)
No description available.
2

A Multi-Methods Approach to Determining Appropriate Locations for Tree Planting in Two of Baltimore's Tree-Poor Neighborhoods

Battaglia, Michael J. 20 July 2010 (has links)
No description available.
3

American Lawn Addictions: Effects of Environmental Education on Student Preferences for Xeriscaping as an Alternative in North Central Texas, USA

Williams, Jared L. 05 1900 (has links)
Urban land use and land cover has changed in the USA, giving rise to the American lawn – manicured, resource-intensive, and non-native. Green infrastructure design has been suggested in the literature as a potential alternative to the American lawn when managed as native xeriscapes, which require little to no irrigation after establishment. Given the influence of public preference on landscaping decisions, what is the relationship between the perceived value and ecological benefits of the American lawn compared to such alternatives? Few studies have explored this question in addition to the effects of college courses on influencing student preferences, as future stakeholders, towards native xeriscapes as alternatives to the American lawn. This research measured the effects of an introductory environmental education (EE) course on measurably influencing undergraduate student preferences for four xeriscapes as alternatives to the American lawn. To measure these effects, this study utilized the perceptions of 488 students enrolled in an indirect introductory EE course and 131 students enrolled in an introductory non-EE course. Three key results emerged from this research. Students preferred the American lawn more than xeriscape alternatives, irrespective to course enrolled. Introductory non-EE did not have an effect on student preferences, whereas indirect introductory EE did show some effects on student preferences. Lastly, student preferences were negatively associated with NPP per photosynthetically active square meter. The data from this study suggests that indirect introductory EE does not shift aesthetic landscape preferences towards pro-environmental alternatives. These results show promise for shifting such preferences via more direct EE approaches.
4

Exploring agricultural structure as a determinant for social and aesthetic functions of agricultural production

Besser, Tim 05 April 2017 (has links)
Diese Dissertation untersucht verschiedene soziale sowie landschaftsästhetische Funktionen der Landwirtschaft in strukturell gegensätzlichen Agrarsystemen. In der Untersuchung wird hierfür stets ein von kleinen Familienbetrieben dominiertes System mit einem stärker großstrukturierten, gewerblichen System verglichen. Die Arbeitszufriedenheit der Landwirte sowie ihre soziale Vernetzung mit der lokalen Gemeinde wurden im Vergleich zwischen dem kleinbäuerlichen Schweizer und dem großbetrieblichen nordostdeutschen System analysiert. Mittels Choice Experimenten wurden in der Schweiz und in Süddeutschland (d.h. kleinbäuerliche Systeme) sowie in Ostdeutschland (d.h. großstruktiertes, gewerbliches System) zudem Bevölkerungspräferenzen für Agrarlandschaften und damit die ästhetische Funktion der Landwirtschaft untersucht. Unter Berücksichtigung der Betriebsstruktur (z.B. Betriebsgröße) sind Schweizer Bauern zufriedener mit ihrer Arbeit als nordostdeutsche. Das Betriebseinkommen ist für nordostdeutsche Bauern signifikant wichtiger für die Arbeitszufriedenheit als für die Schweizer Kollegen. Besonders für Schweizer Bauern spielt die Betriebsdiversifizierung eine positive Rolle für die Zufriedenheit, z.B. die Vielfalt der Produktionszweige oder nicht-landwirtschaftliche Betriebszweige wie Agrotourismus. Auch haben Schweizer Bauern und solche kleinerer Betriebe mehr Bezug zu ihrer lokalen Gemeinde durch lokal fokussierte soziale Netzwerke. Betriebsleiter größerer Betriebe sind hauptsächlich außerhalb der Gemeinden vernetzt und fühlen sich diesen weniger zugehörig. Zudem stärkt ein biographischer Bezug zum Hof die Verbindung mit der Gemeinde. Die Mehrheit der befragten Schweizer und Ostdeutschen ist zudem für qualitative Veränderungen der Agrarlandschaften (d.h. mehr Weiden zur Freilandhaltung, Streuobstwiesen und höhere Biodiversität). Waldrückgange sowie Schlaggrößenveränderungen landwirtschaftlicher oder forstlicher Flächen werden nahezu einheitlich abgelehnt. / This dissertation investigates different social functions of agriculture as well as landscape aesthetics in farming systems of different agricultural structures. Throughout the whole project farming systems dominated by small family farms and large-scale farming systems dominated by commercial non-family farms (e.g. cooperatives) were compared. Farmers’ work satisfaction and their connection to the local community were examined in the small-scaled Swiss system and in the larger scaled Northeast (NE) German one. Public landscape preferences were derived using choice experiments in Switzerland and South Germany, representing small-scale systems, as well as in East Germany, representing a large-scaled one, to explore agriculture‘s aesthetic function. Swiss farmers are more satisfied with their agricultural work if for effects of farm structure (e.g. farm size) is controlled for. Farm income plays a significantly more important role for the work satisfaction of NE German farmers than for that of Swiss ones. Especially for Swiss farmers, farm diversification plays an important role, for example through a diversity of production lines or through non-agricultural activities like agrotourism. Further results show that Swiss farmers and farmers of smaller farms are more connected to their local communities through more locally focused social networks. Farmers of larger farms have their networks farther away from the farm and a weaker sense of belonging to their local community. A biographical bond to the farm also strenghtens the connection to the local community. Concerning public landscape preferences the majority of the Swiss and East German respondents generally prefers qualitative changes to landscapes (i.e. meadows for free range animal husbandry, meadow orchards and more biodiversity). Forest loss or changes in plot sizes of agricultural land and forests are nearly uniformly rejected in all regions.
5

Le paysage, entre esthétique & écologie : modélisation rétrospective à partir de changements d'occupation du sol / The landscape, between aesthetic and ecology : a retrospective modelling based on land-cover changes

Sahraoui, Yohan 01 December 2016 (has links)
Le paysage constitue à la fois un cadre de vie pour les populations humaines et un support du cycle de vie des espèces animales. Les modifications du paysage induites par les dynamiques d’occupation du sol se répercutent sur ces deux dimensions, l’une esthétique et l’autre écologique. Ces logiques étant généralement étudiées dans des champs disciplinaires différents, peu de recherches ont porté sur la manière dont elles s’articulent selon les modifications des structures paysagères.Ce travail cherche donc à modéliser de manière rétrospective la coévolution spatiale des fonctions esthétique et écologique du paysage à partir de métriques spatiales basées sur des données d’occupation du sol. Il se focalise sur les changements intervenus dans les franges urbaines de deux agglomérations françaises (Besançon et Paris) durant les 30 dernières années.La démarche adoptée a d’abord visé à modéliser, à partir des données d’occupation du sol, (1)les préférences paysagères d’un ensemble d’individus et (2) la connectivité écologique pour un ensemble d’espèces animales. En mobilisant de manière complémentaire des analyses statistiques multivariées et des analyses spatiales, le cœur du travail a ensuite consisté à étudier comment ces deux fonctions ont évolué de manière convergente ou divergente au cours du temps. Les résultats donnent de nouveaux éléments de compréhension des relations entre esthétique et écologie du paysage et amènent à s’interroger sur l’intérêt de la modélisation spatiale pour une gestion du paysage conciliant la préservation du cadre de vie des habitants et la conservation de la biodiversité. / Landscape is both a backdrop to the lives of human populations and a medium for the life cycle of animal species. Landscape changes induced by land-use and land-cover dynamics affect both these dimensions, the one aesthetic, and the other ecological. Because these rationales areusually studied within different disciplines, little research has been done into how the two clashor combine as and when landscape structures change. This work seeks therefore to model the spatial co-evolution of the aesthetic and ecological functions of landscape retrospectively usingspatial metrics based on land-cover data. It focuses on changes in the urban fringes of two French cities (Paris and Besançon) over the last 30 years. The approach attempts first to use land-cover data to model (1) the landscape preferences of a set of individuals and (2) the ecological connectivity of a set of animal species. Drawing on both multivariate statistical analysis and spatial analysis, the core of this work consists in investigating how the two functions have evolved in convergent or divergent ways over time. The results provide fresh insight into the relationship between landscape aesthetics and landscape ecology and raise questions about the value of spatial modelling for a landscape management approach that endeavours to reconcile the preservation of residents’ living environments and the conservationof biodiversity.

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