干旱区生态环境知识资源中心(Arid): Demarcating the rainfed unproductive zones in the African Sahel and Great Green Wall regions

Arid

DOI	10.1002/ldr.3793
	Demarcating the rainfed unproductive zones in the African Sahel and Great Green Wall regions
	Elagib, Nadir Ahmed; Khalifa, Muhammad; Babker, Zryab; Musa, Ammar Ahmed; Fink, Andreas H.
通讯作者	Elagib, NA
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
英文摘要	Farming and afforestation in the African Sahel and Great Green Wall (GGW) regions are constrained by climate variability, water scarcity, and degradation of lands. Yet, the debate on dynamics of the Saharan boundary and vegetation productivity in these regions is ongoing. Here, we trace the most unsuitable areas for rainfed agriculture and greening in the two regions over the period 1998-2017 without specifying a crop/vegetation type. A method is devised based on combining June-October rainfall/potential evapotranspiration (aridity index) and integrated normalized difference vegetation index (productivity index). The feasibility of the currently planned GGW is placed in the context of naturally-sound afforestation. The results show certain features of the suitable zone for planting. A seasonal aridity index of 0.1 is a minimum threshold for vegetation vigour to begin. Given the strong interannual north-south progression and retreat of this seasonal level, the northernmost aridity isoline that dictates feasibility of rainfed productivity is found to correspond to the borderline between the arid and semiarid zones. This borderline is delimited by an average aridity index of 0.2. Accordingly, 1,337,535 km(2) (43.5%) and 729,576 km(2) (25.6%) of the Sahel and the proposed GGW region, respectively, are not feasible for sustainable planting, that is, under rainfed and natural land fertility conditions. About 93.0% of the impractical GGW area lies east of longitude 10 degrees E. Investing in a green belt east of this longitude is risky without supplementary irrigation. The contrasting productivity behavior across the GGW cautions the progression in this project without rigorous feasibility investigation.
英文关键词	afforestation aridity index Great Green Wall greening normalized difference vegetation index rainfed agricultural productivity Sahel vegetation dynamics
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000587350700001
WOS关键词	FOOD SECURITY ; CLIMATE-CHANGE ; SUSTAINABLE INTENSIFICATION ; AGRICULTURAL PRODUCTIVITY ; ENVIRONMENTAL-CHANGE ; VEGETATION DYNAMICS ; DROUGHT RISK ; CROP YIELD ; NDVI ; RESILIENCE
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328454
作者单位	[Elagib, Nadir Ahmed] Backingstr 55, D-51063 Cologne, Germany; [Khalifa, Muhammad; Babker, Zryab] Univ Appl Sci, Inst Technol & Resources Management Trop & Subtro, Tech Hsch Koln, Cologne, Germany; [Khalifa, Muhammad] Univ Cologne, Inst Geog, Cologne, Germany; [Musa, Ammar Ahmed] King Fahd Univ Petr & Minerals, Environm Hlth & Safety Dept, KFUPM, Dhahran, Saudi Arabia; [Fink, Andreas H.] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Karlsruhe, Germany
推荐引用方式 GB/T 7714	Elagib, Nadir Ahmed,Khalifa, Muhammad,Babker, Zryab,et al. Demarcating the rainfed unproductive zones in the African Sahel and Great Green Wall regions[J].
APA	Elagib, Nadir Ahmed,Khalifa, Muhammad,Babker, Zryab,Musa, Ammar Ahmed,&Fink, Andreas H..
MLA	Elagib, Nadir Ahmed,et al."Demarcating the rainfed unproductive zones in the African Sahel and Great Green Wall regions".LAND DEGRADATION & DEVELOPMENT