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Displaying 546 - 550 of 1195

Urban Morphology Drives the Homogenization of Tree Cover in Baltimore, MD, and Raleigh, NC

Journal Articles & Books
Décembre, 2014

Heterogeneous land cover patterns contribute to unique ecological conditions in cities and little is known about the drivers of these patterns among cities. We studied tree cover patterns in relationship to urban morphology (for example, housing density, parcel size), socioeconomic factors (for example, education, income, lifestyle characteristics), and historical legacies in Baltimore, Maryland, and Raleigh, North Carolina.

Pastoralism, sustainability, and marketing. A review

Journal Articles & Books
Décembre, 2014

Pastoralism is a highly traditional production system for livestock and livestock products. Under the surface of a seeming stability a variety of pressures of the modern time all seem to accumulate to put the sustainability of the pastoralist production system to the test. Population growth and growing demand for meat, put pressure on the natural resources used by pastoralists because the grazing lands that are saved from encroachment or conversion into arable lands, may be overexploited. Changing climatic conditions, such as frequent droughts, put even more pressure on the system.

How does the landscape context of occurrence data influence models of invasion risk? A comparison of independent datasets in Massachusetts, USA

Journal Articles & Books
Décembre, 2014
États-Unis d'Amérique

The spatial distribution of non-native, invasive plants on the landscape is strongly influenced by human action. People introduce non-native species to new landscapes and regions (propagule pressure) as well as increase ecosystem invasibility through disturbance of native ecosystems. However, the relative importance of different landscape drivers of invasion may vary with landscape context (i.e., the types and amounts of surrounding land cover and land use). If so, data collected in one context may not be appropriate for predicting invasion risk across a broader landscape.

equilibrium analysis of the land use structure in the Yunnan Province, China

Journal Articles & Books
Décembre, 2014
Chine
Global

Global land use structure is changing rapidly due to unceasing population growth and accelerated urbanization, which leads to fierce competition between the rigid demand for built-up area and the protection of cultivated land, forest, and grassland. It has been a great challenge to realize the sustainable development of land resources.

Native plants are the bee’s knees: local and landscape predictors of bee richness and abundance in backyard gardens

Journal Articles & Books
Décembre, 2014

Urban gardens may support bees by providing resources in otherwise resource-poor environments. However, it is unclear whether urban, backyard gardens with native plants will support more bees than gardens without native plants. We examined backyard gardens in northwestern Ohio to ask: 1) Does bee diversity, abundance, and community composition differ in backyard gardens with and without native plants? 2) What characteristics of backyard gardens and land cover in the surrounding landscape correlate with changes in the bee community?