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This Masters of Landscape Architecture investigates the occurrence of small, temporary urban voids in inner northern Melbourne. The study asks whether these spaces operate as Public Domain (Hajer & Reijndorp 2001) and uses the concept of

Thesis (Ph.D.)--University of Delaware, 2007. / Principal faculty advisor: Damie Stillman, Dept. of Art History. Includes bibliographical references.

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Urbanization alters the natural soil structure of landscapes. This has a negative impact on the environment. This degradation of the soil in the urban environment needs management practices that protect and restore the nutrient value in the soil. Soil is one of the most essential elements of landscapes. High quality soils make a major contribution to cleaning water, acting as a filtration system that purifies the water it absorbs. Soil also sustains microorganisms that promote vegetation growth and consequently food production, one of the most important human activities that allows us to thrive as a society. The poor soil conditions in the urban environment make it very difficult to sustain healthy trees and vegetation. Urban soil is "modified through the regrading, compaction, cutting and filling, and, sometimes, contamination that comes with creating buildings, roads and associated land uses", changing the physical, chemical and biological structure of soil. (Trowbridge and Bassuk 3) In general, urban areas require better waste management methods that could use an abundant resource of food and yard waste to make compost. This thesis focuses on composting organic waste in the McNair neighborhood of Fairfax County in order to produce a resource to improve the soil conditions. This improvement would support the vegetation in this urban environment, and, in addition, sequester carbon and divert materials that otherwise would go to landfills. This thesis demonstrates a sustainable method for composting food and yard waste in a mixed-use community in northern Virginia turning waste material into a resource. / Master of Landscape Architecture / The growth of cities has a negative impact on the native soil and vegetation. The expansion of urban areas weakens the microorganisms that live in the soils through soil compaction for the construction of roads and buildings, runoff pollution and the use of chemicals in lawns and gardens. These urban conditions challenge the growth of trees and vegetation in general. Using sustainable waste management practices in cities we can turn organic waste material and turn it into an organic fertilizer to sustain the microorganisms in the soil and promote the growth of vegetation in urban areas. This thesis focuses in composting food waste and yard waste in the McNair neighborhood in Fairfax in order to turn a waste material into a local resource that benefits the community by sustaining green areas and diverting organic waste from going to landfills.

Urbanization alters the natural soil structure of landscapes. This has a negative impact on the environment. This degradation of the soil in the urban environment needs management practices that protect and restore the nutrient value in the soil. Soil is one of the most essential elements of landscapes. High quality soils make a major contribution to cleaning water, acting as a filtration system that purifies the water it absorbs. Soil also sustains microorganisms that promote vegetation growth and consequently food production, one of the most important human activities that allows us to thrive as a society. The poor soil conditions in the urban environment make it very difficult to sustain healthy trees and vegetation. Urban soil is "modified through the regrading, compaction, cutting and filling, and, sometimes, contamination that comes with creating buildings, roads and associated land uses", changing the physical, chemical and biological structure of soil. (Trowbridge and Bassuk 3) In general, urban areas require better waste management methods that could use an abundant resource of food and yard waste to make compost. This thesis focuses on composting organic waste in the McNair neighborhood of Fairfax County in order to produce a resource to improve the soil conditions. This improvement would support the vegetation in this urban environment, and, in addition, sequester carbon and divert materials that otherwise would go to landfills. This thesis demonstrates a sustainable method for composting food and yard waste in a mixed-use community in northern Virginia turning waste material into a resource. / Master of Landscape Architecture / The growth of cities has a negative impact on the native soil and vegetation. The expansion of urban areas weakens the microorganisms that live in the soils through soil compaction for the construction of roads and buildings, runoff pollution and the use of chemicals in lawns and gardens. These urban conditions challenge the growth of trees and vegetation in general. Using sustainable waste management practices in cities we can turn organic waste material and turn it into an organic fertilizer to sustain the microorganisms in the soil and promote the growth of vegetation in urban areas. This thesis focuses in composting food waste and yard waste in the McNair neighborhood in Fairfax in order to turn a waste material into a local resource that benefits the community by sustaining green areas and diverting organic waste from going to landfills.

Due to end users irrigating with excess water, water conservation of turfgrass can make a large impact in urban water conservation by reducing water applied while still maintaining visual appearance. This study was conducted to determine if Kentucky bluegrass (Poapratensis L.) can be deficit irrigated to maintain minimum acceptable appearance while conserving water. The study investigated water stress in terms of stomatal conductance, chlorophyll index, leaf temperature and predawn leaf water potential at the point of water stress, or where visual quality no longer meets expectations during dry down conditions. Water use was measured over well established Kentucky bluegrass with an eddy covariance system that was validated with soil water measurements. Turfgrass was irrigated at 80% of reference evapotranspiration based on allowable depletion of 12 mm of soil water during growing season that was considered to be well-watered. Two dry downs were conducted over a two-year period (early and late summer). Turfgrass was allowed to dry down without irrigation until visual quality reached the minimum acceptable points (score ≤ 6). During drying periods, visual rating, chlorophyll index, predawn leaf water potential, and leaf temperature with stomatal conductance rapidly decreased once stomatal conductance fell to approximately half of well-watered levels. Both soil water content and evapotranspiration had weak correlation with stomatal conductance; however, stomatal conductance tended to have higher correlation with the change in soil moisture than with the change in crop evapotranspiration. Soil water use and eddy covariance data in terms of crop evapotranspiration had high correlation. The plant water use factor ranged from around 0.8 to 1.1 under well-watered condition corresponding to visual rating from 7 to 9. At the minimum acceptable point of visual rating, which is 5.5 to 6, the plant factor ranged from 0.65 to 0.87. This value of plant factor is quite high at this point. Even when Kentucky bluegrass went below acceptable visual quality, the grass still used significant amounts of water with the plant factor value ranging from 0.6 to 0.8. The data suggested that deficit irrigation cannot be applied with Kentucky bluegrass in the Intermountain West area.

Issues associated with urban development such as the urban heat island effect, loss of habitat, increased areas of impervious surfaces leading to storm water management concerns are well known. Many designers, engineers and policy creators are sensitive to these issues creating positive change by implementing alternatives to traditional development. Although, the concept of green roofs is not new to the prairies, modern development of this technology has not been fully embraced. Surrounded by concerns of efficacy and longevity here in the harsh northern prairie climate, green roof development and implementation has been slow. The objective of this practicum is to determine what green roof system and what vegetation of the short grass / fescue prairie and mix grass prairie would succeed in a green roof setting. Determining the appropriate planting palette and growth medium depth for the Canadian Prairies is essential for the development of the green roof industry locally.

Issues associated with urban development such as the urban heat island effect, loss of habitat, increased areas of impervious surfaces leading to storm water management concerns are well known. Many designers, engineers and policy creators are sensitive to these issues creating positive change by implementing alternatives to traditional development. Although, the concept of green roofs is not new to the prairies, modern development of this technology has not been fully embraced. Surrounded by concerns of efficacy and longevity here in the harsh northern prairie climate, green roof development and implementation has been slow. The objective of this practicum is to determine what green roof system and what vegetation of the short grass / fescue prairie and mix grass prairie would succeed in a green roof setting. Determining the appropriate planting palette and growth medium depth for the Canadian Prairies is essential for the development of the green roof industry locally.

Public awareness of declining pollinator populations has increased interest in creating “bee–friendly” urban landscapes. I quantified bee visitation and assemblages of 72 species of flowering woody plants common in urban landscapes. I found strong plant species effects and variation in seasonal activity of particular bee taxa but no overall differences in bee visitation or genus diversity between native versus nonnative species or trees versus shrubs. Analysis of pollen from a subset of these plants revealed small but statistically significant differences in total and essential amino acids between native and nonnative species and trees and shrubs, although each group had species with high quality pollen. Uptake and dissipation of soil–applied imidacloprid and dinotefuran was measured in nectar and leaves of two woody plant species, Ilex × attenuata and Clethra alnifolia to assess concentrations to which pollinators might be exposed in landscape settings. Three application timings were evaluated. Residues in nectar and tissue were analyzed by HPLC–MS/MS in two successive years. Residues in nectar following autumn or spring applications exceed concentrations shown to adversely affect individual and colony–level traits of bees. Summer application mitigated concentrations of imidacloprid (8–31 ng/g), but not dinotefuran (235–1191 ng/g), in nectar.