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Impacts of phased–out land restoration programs on vegetation cover change in Eastern Tigray, Ethiopia
Environmental Systems Research Pub Date : 2021-04-28 , DOI: 10.1186/s40068-021-00231-7
Tirhas Gebregergs , Kassa Teka , Gebeyehu Taye , Eskinder Gidey , Oagile Dikinya

Land restoration programs in Tigray, also called integrated watershed management (IWM) practices, were implemented by the government and non–governmental organizations since 1980s. These practices aimed at reversing land degradation processes, environmental rehabilitation, and ensure food security at both community and household levels. Most of the implemented IWM projects are now phased–out. The aim of this study is therefore; therefore, to investigate the impacts of phased–out land restoration programs on vegetation cover changes in Eastern Tigray, Ethiopia. Both Thematic Mapper (TM) and Enhanced Thematic Mapper plus (ETM+) Landsat imageries at 30 meter by 30 meter spatial resolution were used to examine the land use and land cover conditions taking successful and unsuccessful IWM interventions as case studies. Three time periods were used in the change analysis: before IWM implementation (2007), at the time of IWM projects phase-out (2010), and after IWM phase-out (2017). The results indicated that for all successful integrated watershed management projects, both the bush/shrub land (19.6 ha) and grassland (8.95 ha) increased during the intervention time for Negash (S-1), Deberewahabit (S-2) and Gemad (S-3) watersheds. However, the bush/shrub land decreased after the integrated watershed management projects phased–out by 9.8 and 11.3 ha for S-1 and S-3 watersheds. At the unsuccessful IWM projects, bush/shrub land increased by 18.21, 11.3 and 9.5 ha during the intervention period, and decreased after project phased–out by 3.92 and 7.2 ha at Debretsion (S-4) and Laelay wukro (S-5) watersheds. Furthermore, cultivated land increased after phased–out in most of the watersheds. This study concluded that vegetation cover has been declined in all watersheds after the phased–out period. This may affect significantly the environment in general and livelihood of the community in particular. Therefore, there is a need to provide an emphasis after the implementation of watershed projects and evaluate its impacts regularly.

中文翻译:

埃塞俄比亚东部提格里逐步淘汰的土地恢复计划对植被覆盖变化的影响

自1980年代以来,政府和非政府组织在提格里(Tigray)实施土地恢复计划,也称为综合流域管理(IWM)做法。这些做法旨在扭转土地退化过程,恢复环境,并确保社区和家庭两级的粮食安全。现在,大多数已实施的IWM项目已被逐步淘汰。因此,本研究的目的是;因此,为了调查逐步淘汰的土地恢复计划对埃塞俄比亚东部提格雷的植被覆盖变化的影响。以成功和失败的IWM干预为案例研究,分别使用了30米x 30米空间分辨率的主题地图绘制器(TM)和增强型主题地图绘制器(ETM +)Landsat影像来检查土地使用和土地覆盖情况。在变更分析中使用了三个时间段:IWM实施之前(2007年),IWM项目逐步淘汰时(2010年)和IWM逐步淘汰后(2017年)。结果表明,在Negash(S-1),Deberewahabit(S-2)和Gemad( S-3)分水岭。但是,在综合流域管理项目逐步淘汰后,灌木丛/灌木丛土地减少了,S-1和S-3流域分别减少了9.8和11.3公顷。在失败的IWM项目中,在干预期间,灌木丛/灌木地增加了18.21、11.3和9.5公顷,在项目淘汰后,灌木/灌木地减少了-Debretsion(S-4)和Laelay wukro(S-5)分别减少了3.92和7.2公顷。分水岭。此外,大部分流域逐步淘汰后耕地增加了。这项研究得出结论,在逐步淘汰阶段之后,所有流域的植被覆盖率均下降了。这可能会严重影响整个环境,尤其是社区的生计。因此,有必要在分水岭项目实施后给予重视,并定期评估其影响。
更新日期:2021-04-29
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