Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/esp.4360 |
Gully and soil and water conservation structure densities in semi-arid northern Ethiopia over the last 80years | |
Guyassa, Etefa1,2; Frankl, Amaury1,3; Zenebe, Amanuel2; Poesen, Jean4; Nyssen, Jan1 | |
通讯作者 | Guyassa, Etefa |
来源期刊 | EARTH SURFACE PROCESSES AND LANDFORMS |
ISSN | 0197-9337 |
EISSN | 1096-9837 |
出版年 | 2018 |
卷号 | 43期号:9页码:1848-1859 |
英文摘要 | Gullies have been a common phenomenon in semi-arid northern Ethiopia for the last centuries. However, soil and water conservation (SWC) structures have been implemented for a long time to curb soil erosion. Though, like most of the affected areas worldwide, density and distribution of gullies and SWC structures, their causes and interrelations are poorly understood. The aims of this study were to develop a technique for mapping these densities of gullies and SWC structures, to explain their spatial distribution and to analyze changes over the period 1935-2014. Aerial photographs from 1935 to 1936 and Google Earth images from 2014 of the 5142km(2) Geba catchment were used. Transect lines were established to count gullies and SWC structures in order to calculate densities. On average, a gully density of 1.14kmkm(-2) was measured in 1935-1936 of which the larger portion (75%) were vegetated, indicating they were not very active. Over 80years, gully density has significantly increased to 1.59kmkm(-2) with less vegetation growing in their channel, but 66% of these gullies were treated with check dams. There was c. 3kmkm(-2) of indigenous SWC structures (daget or lynchets) in 1935-1936 whereas a high density (20kmkm(-2)) of introduced SWC structures (mainly stone bunds and terraces) were observed in 2014. The density of gullies is positively correlated with slope gradient and shrubland cover and negatively with cropland cover, whereas the density of SWC structures significantly increased with increasing cropland cover. Density maps of gullies and SWC structures indicate sensitive areas to gully formation and priority areas for the implementation of SWC structures in Geba catchment. The obtained results illustrate the feasibility of the methods applied to map the density of gullies and SWC structures in mountainous areas. Copyright (c) 2018 John Wiley & Sons, Ltd. |
英文关键词 | gully density check dam lynchet stone bund aerial photograph |
类型 | Article |
语种 | 英语 |
国家 | Belgium ; Ethiopia |
收录类别 | SCI-E ; SSCI |
WOS记录号 | WOS:000437831300009 |
WOS关键词 | CENTRAL PLATEAU REGION ; LAND-USE ; TIGRAY HIGHLANDS ; SLOPE GRADIENT ; STONE BUNDS ; RAINFALL INTENSITY ; EROSION FEATURES ; INDIGENOUS SOIL ; LOESS PLATEAU ; HEAD RETREAT |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/208632 |
作者单位 | 1.Univ Ghent, Dept Geog, Ghent, Belgium; 2.Mekelle Univ, Dept Land Resources Management & Environm Protect, Mekelle, Ethiopia; 3.Res Fdn Flanders FWO, Brussels, Belgium; 4.Katholieke Univ Leuven, Dept Earth & Environm Sci, Div Geog, Leuven, Belgium |
推荐引用方式 GB/T 7714 | Guyassa, Etefa,Frankl, Amaury,Zenebe, Amanuel,et al. Gully and soil and water conservation structure densities in semi-arid northern Ethiopia over the last 80years[J]. Arizona State University,2018,43(9):1848-1859. |
APA | Guyassa, Etefa,Frankl, Amaury,Zenebe, Amanuel,Poesen, Jean,&Nyssen, Jan.(2018).Gully and soil and water conservation structure densities in semi-arid northern Ethiopia over the last 80years.EARTH SURFACE PROCESSES AND LANDFORMS,43(9),1848-1859. |
MLA | Guyassa, Etefa,et al."Gully and soil and water conservation structure densities in semi-arid northern Ethiopia over the last 80years".EARTH SURFACE PROCESSES AND LANDFORMS 43.9(2018):1848-1859. |
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