L’expansion et l’intensification agricole ont d’énormes conséquences sur la biodiversité. L’étude des compromis entre production et biodiversité peut aider au ciblage de mesures en faveur de la biodiversité.L’objectif de la thèse était de révéler des stratégies d’utilisation des sols agricoles qui permettraient d’enrayer le déclin des oiseaux agricoles tout en maintenant la production dans un territoire partagé entre grandes cultures et élevage de ruminants.Notre travail s’est basé sur l’étude de corrélations entre des variables décrivant l’utilisation des sols agricoles, la production agricole et plusieurs descripteurs des communautés d’oiseaux dans les milieux agricoles français.Nous avons observé des communautés d’oiseaux très spécialisées et pauvres en espèces dans les régions à haute production végétale ; et des communautés dominées par des oiseaux généralistes dans les régions à haute production animale. La stratégie qui maximise le FBI (un indice d’abondance des oiseaux agricoles) en maintenant la production dans ses composantes animale et végétale combinait une légère extensification des grandes cultures, le renforcement des régions d’élevage extensif et l’intensification des régions d’élevage déjà intensives.Nos résultats soulignent la nécessité d’adopter des solutions différenciées à la production animale et à la production végétale, au-delà de la dichotomie land sparing/land sharing. / Agricultural expansion and intensification have disastrous consequences on biodiversity. Studying the relationship between biodiversity and food production can help devise appropriate measures.The objective of this work was to reveal land use strategies to halt the decline of farmland birds while maintaining agricultural production.Our work was based on the study of correlations between agricultural land use, food production, and various bird community descriptors across French agroecosystems.In high crop production regions, we observed low-diversity communities dominated by few arable specialist species. In high livestock production regions, we observed communities dominated by generalist bird species. The land-use strategy that maximized the Farmland Bird Index under crop and livestock production constraints involved a decrease of crop intensity in the most intensive crop regions and an increase of livestock intensity in the most intensive livestock regions. Extensive livestock production was reinforced in current extensive areas.Our results have shown that different strategies are needed in crop-dominated and in livestock dominated regions.

No description available.

The two maps are located at the end of the thesis. / Abstract Not Provided. / Thesis / Bachelor of Arts (BA)

No abstract provided. / Thesis / Bachelor of Arts (BA)

The Conservation Authorities Act was passed by the Ontario Provincial legislature in 1946 to further the “conservation, restoration, development and development of natural resources other than gas, oil, coal and minerals.” On 8 May 1958, Ontario’s 25th conservation authority was established on the watershed of Spencer Creek near Hamilton. The Spencer Creek Conservation Authority (SCCA) recognized that in order to acquire the necessary lands for conservation it was in a race with developers and urban sprawl. An aggressive land acquisition programme was initiated by the SCCA (1958-1966) and continued by its successor, the Hamilton Region Conservation Authority. The success of this programme from 1958-1971 created a green framework for the region, with many of our most popular and ecological important conservation areas acquired during this period, including: Dundas Valley, Christie Lake, Valens, Spencer Gorge, Beverly Swamp, and Summit Bog. However, acquisition of such a vast acreage of conservation land doesn't just happen by desire, it involves many operational factors. Available funding, administrative policies, land owner engagement, knowledge of the property market, and public and political support were all central aspects of this land acquisition program. This research paper examines these inter-related factors and outlines the many challenges and initiatives that led to the acquisition of over 3,300 acres of land for conservation. / Thesis / Master of Arts (MA)

This work involves not only a study of the mode and pattern of land utilization as it exists in Clinton Township in 1953 but also a consideration of the reasons why man is making use of the land in the manner that he is. It has been found that even in a micro-study of this nature, positive correlations can be made between the various ways that man is making use of the land and the diverse factors of his environment. In some cases he has overcome adverse physical conditions by artificial means and so altered the physical environment to suit his needs. In other cases the physical conditions have been unalterable and man has been forced, therefore, to adapt his activity to conform to them. As regards the human environment, it has become evident that man himself creates difficulties which are almost as serious as those of the physical sphere and which, in some instances, may curtail freedom of economic activity considerably. / Thesis / Bachelor of Arts (BA)

Using parcel level and sub-parcel level data, we analyze Mississippi cropland sales from 2015-2017 and consider how cropland values are affected by their respective characteristics. Such a study has not been conducted in the state of Mississippi. The dataset used is sourced from a private bank in Mississippi and contains information on the unique attributes and amenities of each land parcel sold. Information garnered from the dataset also allows for analysis of the public SSURGO soil characteristics of each land parcel. A hedonic model and spatial error model is used to analyze the impact that the attributes and amenities of each land parcel have on their respective value. It is concluded that physical improvements, soil characteristics, and regional characteristics have a significant impact on the value of cropland.

Daily temperature variations across an area can often be attributed to differences in land use/land cover (LULC). This study focuses on the relationships between the diurnal temperature ranges (DTRs) of 145 weather stations, classified as urban, agriculture, evergreen forests, deciduous forests, pine forests, and mixed forests. Paired samples t-tests were employed to test for significant DTR differences due to LULC type, season, and air mass type. Conflicting with previous research, agricultural areas reported the lowest DTRs, which may be due to the vegetation or to other physiographic variables. The forest types showed very few significant DTR differences. All of the LULC types experienced an annual bimodal DTR pattern, with peaks in April and October. Results of this study show that air mass has the largest influence on DTR (over LULC and season), therefore, the annual variability of air mass occurrence is most likely cause of the bimodal pattern.

No description available.

No description available.