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Impact of sustainable land management on vegetation cover using remote sensing in Magera micro Watershed, Omo Gibe Basin, Ethiopia
International Journal of Applied Earth Observation and Geoinformation ( IF 7.5 ) Pub Date : 2021-08-18 , DOI: 10.1016/j.jag.2021.102495
Aklilu Assefa 1, 2 , Alemseged Tamiru Haile 3 , C.T. Dhanya 4 , David W. Walker 5, 6 , John Gowing 7 , Geoff Parkin 6
Affiliation  

The hydrological impact of many expensive investments on watershed interventions remains unquantified due to lack of time series data. In this study, remote sensing imagery is utilized to quantify and detect vegetation cover change in Magera micro-watershed, Ethiopia, where sustainable land management interventions have been implemented. Normalized difference vegetation index (NDVI) values were retrieved for the period 2010 to 2019, which encompasses before, during and after the interventions. Mann-Kendal trend test was used to detect temporal trends in the monthly NDVI values. In addition, multiple change-point analyses were carried out using Pettitt’s, Buishand’s and Standard Normal Homogeneity (SNH) tests to detect any abrupt changes due to the watershed interventions. The possible influence of rainfall on changes in vegetation cover was investigated. A significant increasing trend (from 1.5% to 33%) was detected for dense vegetation at the expense of a significant reduction in bare land from 40.9% to 0.6% over the analysis period. An abrupt change in vegetation cover was detected in 2015 in response to the interventions. A weak and decreasing correlation was obtained between monthly rainfall magnitude and NDVI values, which indicates that the increase in vegetation cover is not from rainfall influences. The study shows that the sustainable land management has an overall positive impact on the study area. The findings of this research support the applicability of remote sensing approaches to provide useful information on the impacts of watershed intervention investments.



中文翻译:

可持续土地管理对埃塞俄比亚奥莫吉贝盆地 Magera 微型流域遥感植被覆盖的影响

由于缺乏时间序列数据,许多昂贵的投资对流域干预的水文影响仍未量化。在这项研究中,遥感图像被用来量化和检测埃塞俄比亚 Magera 微流域的植被覆盖变化,在那里实施了可持续的土地管理干预措施。检索了 2010 年至 2019 年期间的归一化差异植被指数 (NDVI) 值,包括干预之前、期间和之后。Mann-Kendal 趋势检验用于检测每月 NDVI 值的时间趋势。此外,还使用 ​​Pettitt、Buishand 和标准正态同质性 (SNH) 测试进行了多个变化点分析,以检测由于分水岭干预引起的任何突然变化。调查了降雨对植被覆盖变化的可能影响。检测到密集植被的显着增加趋势(从 1.5% 到 33%),代价是在分析期间裸地从 40.9% 显着减少到 0.6%。由于干预措施,2015 年检测到植被覆盖发生了突然变化。月降雨量与 NDVI 值之间的相关性较弱且呈递减趋势,表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。检测到密集植被的显着增加趋势(从 1.5% 到 33%),代价是在分析期间裸地从 40.9% 显着减少到 0.6%。由于干预措施,2015 年检测到植被覆盖发生了突然变化。月降雨量与 NDVI 值之间的相关性较弱且呈递减趋势,表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。检测到密集植被的显着增加趋势(从 1.5% 到 33%),代价是在分析期间裸地从 40.9% 显着减少到 0.6%。由于干预措施,2015 年检测到植被覆盖发生了突然变化。月降雨量与 NDVI 值之间的相关性较弱且呈递减趋势,表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。6% 在分析期间。由于干预措施,2015 年检测到植被覆盖发生了突然变化。月降雨量与 NDVI 值之间的相关性较弱且呈递减趋势,表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。6% 在分析期间。由于干预措施,2015 年检测到植被覆盖发生了突然变化。月降雨量与 NDVI 值之间的相关性较弱且呈递减趋势,表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。这表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。这表明植被盖度的增加并非受降雨影响。研究表明,可持续土地管理对研究区具有整体积极影响。这项研究的结果支持遥感方法的适用性,以提供有关流域干预投资影响的有用信息。

更新日期:2021-08-19
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