干旱区生态环境知识资源中心(Arid): Modis Derived Vegetation and Aridity Indices Account for Spatial Variation in Desertification Risk Index in Dry Environment

Arid

	Modis Derived Vegetation and Aridity Indices Account for Spatial Variation in Desertification Risk Index in Dry Environment
	Salako, G.; Adebayo, A.; Sawyerr, H.; Badmos, B.; Adio, A.; Jambo, U. M.
通讯作者	Salako, G (corresponding author), Kwara State Univ, Dept Environm Management & Toxicol, Malete, Nigeria.
来源期刊	INTERNATIONAL JOURNAL OF ECOLOGY & DEVELOPMENT
ISSN	0972-9984
EISSN	0973-7308
出版年	2021
卷号	36 期号:1 页码:46-63
英文摘要	It was estimated annually that several thousands of hectares (ha) of land has been lost to desertification and the negative impacts are manifested on the environment and general livelihood of people; reduced capacity to provide for the basic needs such as food and water. Although this is true of many countries in Sub Sahara Africa, yet the spatial pattern of the level of desertification and the areas at risk has not been sufficiently quantified and mapped. This study is aimed at determining and mapping the spatial extent of desertification risk index in the 9 frontline states of Northern Nigeria and to identify areas and population that are at risk given the current condition to enhance mitigation and adaptation strategy plan. We used both aridity and vegetation indices in combination with elevation and urban/settlement population data to determine and mapped the risk of desertification in the nine frontline states. To obtain aridity index we used De Martonne aridity index (lar-DM) equation; this was calculated from the raster layers of mean annual temperature (MAT) and total annual precipitation (TAP) using map algebra. To monitor vegetation conditions we used eMODIS NDVI 10-day maximum-value composite MVC NDVI images at 250m spatial resolution. We created desertification risk index map from spatial overlay of NDVI/vegetation cover, elevation, population and aridity index. The study shows that aridity in the study area increases northward in curvilinear pattern as 75 % (430,650 km(2)) of the region falls into three aridity categories: arid, semi-arid and dry sub humid while the remaining 25% (33,000 km(2)) found in southern Kebbi, Zamfara, Katsina and Bauchi falls under sub humid. Aridity index as proximate of the desertification was however found to be inadequate as the combination of vegetation index produced desertification risk index (DRI) map which has helped to identify hot spot these are places where risks to desertification are higher than their surrounding areas. Suggestions such as sound land management, energy substitution strategy are made to combat the menace of desertification with special attention placed on these highly vulnerable hot spot areas.
英文关键词	Aridity index vegetation index desertification risk climatic variability
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000621633900004
WOS关键词	CLIMATE-CHANGE ; CLASSIFICATION
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352852
作者单位	[Salako, G.; Sawyerr, H.; Badmos, B.] Kwara State Univ, Dept Environm Management & Toxicol, Malete, Nigeria; [Adebayo, A.] Modibbo Adama Univ Technol, Dept Geog, Yola, Nigeria; [Adio, A.] Kwara State Univ, Dept Plant & Environm Biol, Malete, Nigeria; [Jambo, U. M.] Umar Suleiman Coll Educ Gashua, Dept Geog, Yobe, Nigeria
推荐引用方式 GB/T 7714	Salako, G.,Adebayo, A.,Sawyerr, H.,et al. Modis Derived Vegetation and Aridity Indices Account for Spatial Variation in Desertification Risk Index in Dry Environment[J],2021,36(1):46-63.
APA	Salako, G.,Adebayo, A.,Sawyerr, H.,Badmos, B.,Adio, A.,&Jambo, U. M..(2021).Modis Derived Vegetation and Aridity Indices Account for Spatial Variation in Desertification Risk Index in Dry Environment.INTERNATIONAL JOURNAL OF ECOLOGY & DEVELOPMENT,36(1),46-63.
MLA	Salako, G.,et al."Modis Derived Vegetation and Aridity Indices Account for Spatial Variation in Desertification Risk Index in Dry Environment".INTERNATIONAL JOURNAL OF ECOLOGY & DEVELOPMENT 36.1(2021):46-63.