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Publicação
Land cover dynamics in Savanna Ecosystem of Borena Ethiopia
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Autores
Orientador(es)
Resumo(s)
A study was conducted to examine land use and land cover change dynamic and
spatial pattern of landscape structure in arid and semi-arid rangeland of Borena,
Ethiopia. Three multi-temporal satellite (TM, and ETM+) images of 1987, 1995
and 2003 were used. Supervised maximum likelihood classification at pixel level
and post-classification comparison of images was used. The landscape structures
were calculated using Fragstats3.3 soft ware. Over the past 16 years, the arid and
semi-arid savanna ecosystem of the Borena experienced land use and land cover
change. Result indicated that about 39.04% of the total landscape remains
unchanged and about 51.8% of total landscape was covered by bush land and
woodland together. During 1987 to 2003 bush land, cultivation and urbanization
had increased by 17%, 72.49% and 79.75% whereas woodland (11.68%) grassland
(7.73%) and shrubby grassland (86.14%) were reduced. Spatial metrics analysis
showed that during 1987 to 2003 the Borena landscape went through important
change. The resulting landscape has become more fragmented and indicated by the
proliferation of large number of patch, increasing of patch density, decreasing of
largest patch index; more diversity and heterogeneity with tend to more unevenly
distribution of patch and irregular shape patch within landscape. In overall, the
present tendency of bush and woodland cover in the landscape may lead to more
bush encroachment and grassland shrinkage if no proper measurement has taken.
The continued land use cover change, coupled with a drier and climatic variability
and considering human induced factor in the area, it is likely that the landscape
change tendency will be continued which greatly affects people’s livelihood and
put the pastoral production system under increasing threat.
Descrição
Dissertation submitted in partial fulfillment of the requirements for the Degree of Master of Science in Geospatial Technologies.
Palavras-chave
Land use change Landscape structure Spatial metrics Vegetation cover Borena pastoralist Ethiopia