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Conversion of savanna rangelands to bush dominated landscape in Borana,Southern Ethiopia

Ecological Processes 2016年第1期5卷 60-77页

作者： Teshome Abate Ayana Angassa School of Animal and Range Sciences Hawassa UniversityHawasaEthiopia

Introduction:Analyzing trends of land use systems and the changes occurred overtime is an effective way of assessing the impacts of land use/land cover(LULC)changes on ecosystem *** provides important insights for understanding the spatial patterns of land use *** rangelands of southern Ethiopia are adversely affected by increased human population pressure,encroachment of crop cultivation,and bush ***,it is vital to understand the trends of rangeland vegetation cover ***:This paper evaluates land use/land cover changes and spatial patterns between 1987 and 2003 in Yabelo(5426 km2),Borena rangelands of southern *** used a combination of three Landsat Thematic Mapper(TM)1987,Landsat TM 1995 and Enhanced Thematic Mapper Plus(ETM+)2003,and local perceptions.A pixelbased supervised classification with maximum likelihood classifier was used to classify *** accuracy of classification was assessed for 1987(81.8%),1995(84.6%),and 2003(81.3%).Results:The results showed that the Borana rangelands had undergone substantial changes during the last 16 *** 1987 and 2003,we observed a considerable increase in woodland cover(11.7%),bushland cover(17%),cultivated land(72.5%),and settlements(79.8%).The results showed a rapid decline in grassland cover(7.7%),shrubby grassland cover(86%),and bareland(0.7%).The spatial pattern analysis indicate that the Borana rangeland was fragmented and characterized by the proliferation of large numbers of patches with a decline in patch index,increased patch density,and irregular shape of patches within a *** communities’perceptions indicate that recurrent drought,increased human population size,and expansion of cultivation were largely responsible for the observed LULC changes in the study ***:LULC changes contribute to rangeland degradation and weaken the traditional practices of rangeland *** suggest appropriate management measures to halt the

关键词： Bush encroachment Landscapepattern Remotesensing LULC boranarangeland

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