Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

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Roots of silver maple (Acer saccharinum L.) trees from downtown Montreal and the municipal nursery in Terrebonne were sampled to determine their vesicular-arbuscular mycorrhizal (VAM) colonization levels. Soil was analyzed to determine the concentration of various soil nutrients, pH, and bulk density. It was found that trees from downtown Montreal grow in soils with lower phosphorus and magnesium, and higher copper, zinc, sodium, pH and bulk density than nursery trees. Downtown tree health, in terms of % dieback, was positively correlated with soil phosphorus, potassium, calcium, the phosphorus:copper ratio and negatively correlated with soil copper, zinc, bulk density and tree age. It is suggested that tree health and survival are associated with tree location. Older and healthier trees grow on streets that provide larger soil volumes. Downtown trees had significantly higher VAM colonization levels (44.9%) than those from the nursery (36.1%). The colonization level in downtown trees was positively correlated with the phosphorus:copper ratio and tree age, and negatively correlated with soil potassium. It is hypothesized that downtown trees living under the most stress will be those with the highest VAM colonization. Under controlled conditions 81.5% of the variability of % VAM infection of silver maple seedlings could be explained by soil zinc, phosphorus, copper, sodium, and potassium. Zinc, phosphorus and copper negatively affected VAM colonization, while a slight positive effect of sodium and potassium was found. This suggests that VAM colonization in downtown trees may be affected by soil factors, but the effects may be masked by other conditions, such as water stress, light, or size of root systems.

The purpose of this thesis is to explore certain of the dynamics associated with the physical transformation of cities, using Montreal between 1846 and 1918 as a case study. Beyond the typical description or classification of urban forms, this study deals with the essential problem of how changes in form occurred as the city underwent a rapid growth and industrialization. Drawing insights from three different bodies of research---neoclassical theories of land rent, Marxian theories of capital accumulation, and space syntax theories of urban form---a theoretical and methodological approach is formulated which considers the city as a dynamic system, and acknowledges circulation as the driving force behind urban morphological change. It is argued that the built form of Montreal was continuously shaped and reshaped by the evolving strategies of a local "growth machine" which sought to reduce the turnover time of capital by "redimensioning" the urban "vascular system": that is, the streets, sidewalks, tracks, bridges, elevators, and canals, within which circulation takes place. This claim is interrogated and developed in each chapter through a series of empirical analyses utilizing evidence from several high-quality sources (e.g. atlases, municipal tax rolls, city surveyor reports, building inspector reports, photographs, and newspapers) to investigate the critical processes of building and rebuilding associated with phenomena such as destructive fires, the modernization of the port, street widenings, and the reconfiguration of the street grid. Each investigation explores the relationship between circulation and urban morphology. The series of investigations revealed certain regularities with respect to the spatial and temporal properties of morphological change. Consistent with expectations based on existing theories and research, the findings confirm the importance of centrality and accessibility to urban form, for the distribution of rents, and for patterns of land

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La Chambre de commerce du district de Montréal et les idéologies qu'elle propose n'échappent pas aux mutations et aux bouleversements de la société québécoise d'après-guerre. De 1945 à 1952, celle-ci véhicule un ordre économique inspiré par un libéralisme classique subordonné à un ordre social influencé, quant à lui, par la doctrine sociale de l'Église catholique. De 1953 à 1960, le discours de la Chambre de commerce du district de Montréal est davantage marqué par les postulats du libéralisme réformiste. Parallèlement à cette évolution du discours économique nous constatons un changement à l'égard d'une autre idéologie proposée, le nationalisme. De défensif au départ, le nationalisme de la bourgeoisie francophone montréalaise va prendre un caractère plutôt offensif après 1953. / Québec Université Laval, Bibliothèque 2013

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