期刊名称：The Journal of Sustainable Development in Africa (JSDA)
电子版ISSN：1520-5509
出版年度：2011
卷号：13
期号：4
出版社：Institute of Sustainable Development in Africa
摘要：The objective of this study was to examine land use/cover dynamics and its implications in Lake Alemaya watershed through
interpretation of aerial photographs (1965 and 1996) and satellite imagery (2007). The study showed that aquatic vegetation,
urban built-up area, cultivated and rural settlement, forest, grass, open water, marsh and shrub land use/cover patterns of the
watershed. A significant spatial – temporal expansion of urban built-up and cultivated and rural settlement lands was
observed. The proportions of forest, grass and shrub lands decreased considerably. The lake dried-out and was replaced
mainly by grass, aquatic vegetation and marsh. The number of rural dwelling units increased from 925 in 1965 to 1390 in
1996. Length of gullies increased from 93.88km in 1965 to 154.38 km in 2007. These have implications for environmental
degradation in the form of soil erosion, decreasing available water and the subsequent drying-out of Lake Alemaya. To tackle
problems, development of a watershed land-use plan and soil and water conservation methods is needed.
关键词：Change detection, land degradation, Expansion, Reduction
