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ARPN Journal of Science and Technology >> Volume 7, Issue 2, November 2017

ARPN Journal of Science and Technology


Woody Vegetation Changes across the Wadi System to the Stony Hill Slopes in Zalingei Area, Darfur-Sudan

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Author Nasreldin Adam Ali, Abuelgasim Abdalla Adam, Mohamed Abdo Desougi
ISSN 2225-7217
On Pages 1-9
Volume No. 5
Issue No. 1
Issue Date February 01, 2015
Publishing Date February 01, 2015
Keywords Woody vegetation, geomorphology, changes, terraces, Wadi system, soil



Abstract

This present study was fielded in the year 2013 in Zalingei area of central Darfur state; Sudan. The main objective of the study was to investigate the status of woody vegetation (trees and shrubs) in terms of diversity and distribution and compare it to Wickens, (1976). The study was also designed to identify the woody species in the area with emphasis to abundance, absolute abundance, relative abundance, dominance, relative dominance and importance value index for trees with DBH> = 7 cm. The study takes into account the woody vegetationís diversity and distribution based on soil types and topography. Reconnaissance survey was made to identify sites, and accordingly the survey area was stratified into eleven sites according to soil type, slope and distance from Wadi system. The systematic circular sampling design and the strip sampling were applied to inventory the woody vegetation. The study area was divided into seven ecological zones namely contemporary flood plain, lower terraces, upper terraces, clay plain, sedentary plain, lower hill slope and stony hill slope. The parameters measured included number of tree species per unit arrear and growth performance. The collected data was analyzed using SPSS and Excel. Simpson diversity index of woody species was calculated for the different sites. Moreover, Sorensen coefficient of similarity was calculated for similar terraces. Simpson Diversity Index was found to range between 0.15 and 1.Sorensen coefficient of similarity was found to range between 20% and 39 %. Results explain that Faidherbia albida dominated the contemporary flood plains, lower terraces Balanites aegyptiaca, Acacia seyal dominated the upper terraces. On the other hand, Acacia seyal dominated the clay plain. Albizia amara, Acacia Senegal dominated the sedentary plains. On the lower hill slopes Albizia amara, Acacia Senegal and Balanites aegyptiaca are dominant. Boswellia papyrifera, Albizia amara are dominant on stony hill slopes. The results show that on the average there are 67.3 tree/ha in the study area. After four decades of Wickenís findings, there appears a little change in the species composition of the area except for the appearance of Acacia Senegal however, the stocking densities dropped sharply and this is the main change together with the disappearance of some species such as Kenya sengealensis and Cordia Abyssinia.


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