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Land use/cover spatiotemporal dynamics, driving forces and implications at the Beshillo catchment of the Blue Nile Basin, North Eastern Highlands of Ethiopia
Environmental Systems Research Pub Date : 2019-06-07 , DOI: 10.1186/s40068-019-0148-y
Asnake Yimam Yesuph , Amare Bantider Dagnew

BackgroundLand use/cover (LULC) change is a dynamic and complex process that can be caused by many interacting processes ranging from various natural factors to socioeconomic dynamics . It exerts a strong influence on the structure, functions and dynamics of most landscapes. Monitoring and mapping of LULC dynamics are crucial as changes observed reflect the status of the environment and provide input parameters for optimum natural resources management and utilization. The objective of this study was to quantify the spatio-temporal LULC dynamics using satellite image coupled with local perceptions in the Gedalas watershed of the Blue Nile Basin, North Eastern Ethiopia. Maximum likelihood supervised image classification technique were employed to classify LULC categories. After ensuring acceptable accuracy value for each classified image, image differencing approach was used to detect and quantify LULC transitions of the area. Classification results were validated with the aid of field work, topographic maps, and high resolution Google earth images supplemented with other available thematic data sets.The resultsThe result demonstrated seven major LULC classes and the overall scenario presented by the study reveals that the watershed has experienced quite visible LULC transitions that seem to be continued in the future due to eternal anthropogenic activities and natural factors. The study ascertain that though there was change in all land use types, the major change detected was a consistent expansion of farmland/settlements area mainly at the expense of Afro/sub Afro alpine vegetation areas. On the contrary, Afro/sub Afro alpine vegetation showed a consistent net loss of over the study of periods. The findings also highlighted that transitions were ultimately driven by the interplay of biophysical, socioeconomic and institutional factors. Perceptions of the local communities on the LULC change substantially agree with data from satellite images. This implies that the ongoing rural land administration and natural resource conservation and management strategies could not effectively address the expansion of agricultural land towards fragile and marginal lands in the study area.ConclusionThe study concludes that if these trends of crop lands expansion allowed continuing, sooner or later there will be no Afro/sub Afro alpine vegetation will remain. Therefore, local governments should strive to expand SLM activities on such mountain ecosystems and other marginal lands focusing on community livelihood diversification and sustainable intensification strategies.

中文翻译:

埃塞俄比亚东北部高地青尼罗河流域 Beshillo 流域的土地利用/覆盖时空动态、驱动力和影响

背景土地利用/覆盖 (LULC) 变化是一个动态而复杂的过程,可以由许多相互作用的过程引起,从各种自然因素到社会经济动态。它对大多数景观的结构、功能和动态产生强烈影响。LULC 动态的监测和制图至关重要,因为观察到的变化反映了环境状况,并为优化自然资源管理和利用提供了输入参数。本研究的目的是使用卫星图像以及埃塞俄比亚东北部青尼罗河流域的 Gedalas 流域的当地感知来量化时空 LULC 动态。采用最大似然监督图像分类技术对 LULC 类别进行分类。在确保每个分类图像可接受的精度值后,图像差分方法用于检测和量化该区域的 LULC 转换。借助实地工作、地形图和高分辨率谷歌地球图像并辅以其他可用的专题数据集,对分类结果进行了验证。结果显示了 7 个主要的 LULC 类,研究呈现的总体情景表明流域经历了由于永恒的人为活动和自然因素,非常明显的 LULC 转变似乎在未来继续。研究确定,尽管所有土地利用类型都发生了变化,但检测到的主要变化是农田/定居点面积的持续扩张,主要以非洲/亚非洲高山植被区为代价。相反,Afro/sub Afro 高山植被在研究期间显示出一致的净损失。研究结果还强调,转变最终是由生物物理、社会经济和制度因素的相互作用驱动的。当地社区对 LULC 变化的看法与卫星图像数据基本一致。这意味着正在进行的农村土地管理和自然资源保护和管理战略无法有效解决研究区农业用地向脆弱和边缘土地的扩张问题。结论本研究得出的结论是,如果这些耕地扩张趋势允许继续下去,或早或以后将不再有非洲/亚非洲高山植被。所以,
更新日期:2019-06-07
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