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

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 function. It provides important insights for understanding the spatial patterns of land use processes. The rangelands o...

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Autores principales: Abate, Teshome, Angassa, Ayana
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4986346/
https://www.ncbi.nlm.nih.gov/pubmed/27570724
http://dx.doi.org/10.1186/s13717-016-0049-1
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author Abate, Teshome
Angassa, Ayana
author_facet Abate, Teshome
Angassa, Ayana
author_sort Abate, Teshome
collection PubMed
description 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 function. It provides important insights for understanding the spatial patterns of land use processes. The rangelands of southern Ethiopia are adversely affected by increased human population pressure, encroachment of crop cultivation, and bush encroachment. Hence, it is vital to understand the trends of rangeland vegetation cover dynamics. METHODS: This paper evaluates land use/land cover changes and spatial patterns between 1987 and 2003 in Yabelo (5426 km(2)), Borena rangelands of southern Ethiopia. We used a combination of three Landsat Thematic Mapper (TM) 1987, Landsat TM 1995 and Enhanced Thematic Mapper Plus (ETM+) 2003, and local perceptions. A pixel-based supervised classification with maximum likelihood classifier was used to classify images. The 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 years. Between 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 landscape. Local 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 area. CONCLUSIONS: LULC changes contribute to rangeland degradation and weaken the traditional practices of rangeland management. We suggest appropriate management measures to halt the impact of disturbances on LULC dynamics and its implication on the livelihoods of the Borana pastoralists.
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spelling pubmed-49863462016-08-26 Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia Abate, Teshome Angassa, Ayana Ecol Process Research 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 function. It provides important insights for understanding the spatial patterns of land use processes. The rangelands of southern Ethiopia are adversely affected by increased human population pressure, encroachment of crop cultivation, and bush encroachment. Hence, it is vital to understand the trends of rangeland vegetation cover dynamics. METHODS: This paper evaluates land use/land cover changes and spatial patterns between 1987 and 2003 in Yabelo (5426 km(2)), Borena rangelands of southern Ethiopia. We used a combination of three Landsat Thematic Mapper (TM) 1987, Landsat TM 1995 and Enhanced Thematic Mapper Plus (ETM+) 2003, and local perceptions. A pixel-based supervised classification with maximum likelihood classifier was used to classify images. The 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 years. Between 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 landscape. Local 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 area. CONCLUSIONS: LULC changes contribute to rangeland degradation and weaken the traditional practices of rangeland management. We suggest appropriate management measures to halt the impact of disturbances on LULC dynamics and its implication on the livelihoods of the Borana pastoralists. Springer Berlin Heidelberg 2016-05-04 2016 /pmc/articles/PMC4986346/ /pubmed/27570724 http://dx.doi.org/10.1186/s13717-016-0049-1 Text en © Abate and Angassa. 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Research
Abate, Teshome
Angassa, Ayana
Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia
title Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia
title_full Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia
title_fullStr Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia
title_full_unstemmed Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia
title_short Conversion of savanna rangelands to bush dominated landscape in Borana, Southern Ethiopia
title_sort conversion of savanna rangelands to bush dominated landscape in borana, southern ethiopia
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4986346/
https://www.ncbi.nlm.nih.gov/pubmed/27570724
http://dx.doi.org/10.1186/s13717-016-0049-1
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