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Displaying 1321 - 1325 of 1605impact of a growing bioethanol industry on food production in Brazil
The Brazilian production of major food commodities increased fivefold between 1961 and 2008. In the same time, the area cropped with sugar cane increased with high growth rates, currently covering 3% of the area dedicated to agricultural production in Brazil. In order to assess a possible competition between biofuel and food production, the development of agricultural productivity and area expansion in the past was analysed. Furthermore, the future situation of land resources for agricultural production was illustrated.
Dynamic land use and land cover changes and their effect on forest resources in a coastal village of Matemwe, Zanzibar, Tanzania
Recent land cover change estimates show overall decline of tropical forests at the regional and global scales caused by multiple social, cultural and economic factors. There is an overall concern on the prevailing land use practices, such as shifting cultivation and extraction of forest materials as agents of forests losses, but also new, emerging land uses are threatening tropical forests. Understanding of the long-term development and driving forces of forest changes are needed, especially at local levels where many decisions on forest policies and land uses are made.
Local residents’ perceptions of energy landscape: the case of transmission lines
Although the transmission line network is relatively comprehensive in many countries, there are new needs to develop the networks due to the increased consumption of energy and new decentralized energy sources. However, compared with other large-scale infrastructure in the landscape, there has been relatively little research on the perceptions of transmission lines. Consequently, the aim of this study was to analyse how transmission lines are perceived in comparison with other landscape elements and how the perceptions of existing transmission lines differ from those concerning new lines.
Post-1935 changes in forest vegetation of Grand Canyon National Park, Arizona, USA: Part 2--Mixed conifer, spruce-fir, and quaking aspen forests
This study examined changes in never-harvested mixed conifer (MCF), spruce-fir (SFF), and quaking aspen forests (QAF) in Grand Canyon National Park (GCNP), Arizona, USA based on repeat sampling of two sets of vegetation study plots, one originally sampled in 1935 and the other in 1984. The 1935 plots are the earliest-known, sample-intensive, quantitative documentation of forest vegetation over a Southwest USA landscape. Findings documented that previously described increases in densities and basal areas attributed to fire exclusion were followed by decreases in 1935-2004 and 1984-2005.
Land-use change in the ‘edgelands’: Policies and pressures in London's rural–urban fringe
Green Belt policies have helped to create chaotic landscapes at the rural–urban interfaces of the United Kingdom's largest cities. Their prime functions, to control urban sprawl and preserve an encircling green girdle to separate the urban from the open countryside, have created ‘edgelands’ that have been remarkably dynamic despite relatively strong controls on certain types of development.