Land Use/ Land Cover Dynamics and Vegetation Vulnerability Analysis: a Case study of Arsi Negele Wereda

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Addis Ababa Universty


With rapid increases in population and continuing expectations of growth in the standard of living, pressure on natural resource use have become intense . The task of effective resource allocation is of paramount importance for natural resource management. In this study, land use land cover dynamics and vegetation vulnerability mapping of Arsi Negele wereda have been produced using GIS and Remote Sensing, as a decision support in the realm of resource allocation. The land use/land cover condition of the study area have been spatially compared using multi temporal analysis of four episodic satellite images;1973 MSS,1986 TM ,2000 ETM+ and 2006 ASTER . Vegetation vulnerability map of the study area have been produced using multi criteria decision evaluation. Four model parameters: proximity to road, slope, proximity to settlement, and land use management have been used to run the vulnerability model. Moreover, fragmentation index and landscape diversity index have been used, in order to study the land use structural change of the landscape. The result of multitemporal imagery has depicted that the study area has undergone a series of land degradation from 1973 up to 2006. During this time, the lakes have shrunk, the high forest and the acacia wood land have decreased, whereas, cultivated lands and degraded lands have increased. The diversity index has decreased resulting in decline ecological abundance and complexity of the landscape. Fragmentation indices of most land cover classes have increased resulting in habitat fragmentation which is one of the major causes of biodiversity loss. The resultant vegetation vulnerability map along with the land use /land cover and structural dynamics can serve local planners and scientists as a primary source of information for NRM (natural resource management) of the study area. Key words: GIS, RS, land use /land cover, vulnerability model, vegetation, land use structure, rift valley, Arsi Negele



GIS, RS, land use /land cover, Vulnerability model, Vegetation, land use structure, Rift valley, Arsi Negele