Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
Vol. 21, No. 6, 2017, pp. 1135-1142
Bioline Code: ja17139
Full paper language: English
Document type: Research Article
Document available free of charge
Journal of Applied Sciences and Environmental Management, Vol. 21, No. 6, 2017, pp. 1135-1142
© Copyright 2017 - Journal of Applied Sciences and Environmental Management
Drought Impact Assessment on Vegetation over Sudano-Sahelian Part of Nigeria|
FABEKU, BB & FALEYIMU, OI
This study evaluated the vegetation response to drought over the Sudano-Sahelian part of Nigeria.
Landsat and monthly rainfall data with boundary map shapefile data. The results of SPI analysis revealed that the
drought saga of the 70s and 80s was also experienced over the study area but later reversed in the 90s towards the 21st
century as the result show a rapid decline in its occurrence which indicates improvement in rainfall. On the other
hand, the vegetation response analysis also depicted that the year 1986 was a dry year over the study area as the
spatial extent cover by the vegetation was much less compared to the bare-surface. But in the 1990s, greenness has
returned to the areas that were previously bare soil, an indication of improvement in rainfall amount over the area.
The study therefore concluded that there exists a kind of inverse relationship between drought intensity and
vegetation growth and time lag in their response to dry or wet condition.
Drought Occurrence; Vegetation response; Standardize Precipitation Index (SPI); Normalized Precipitation Index (NDVI); Greenness Index (GI); Drought Spatial Map