University of Khartoum

Eco- taxonomic Study on the vegetation of Um Rimmitta Area, White Nile State (Central Sudan)

Eco- taxonomic Study on the vegetation of Um Rimmitta Area, White Nile State (Central Sudan)

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Title: Eco- taxonomic Study on the vegetation of Um Rimmitta Area, White Nile State (Central Sudan)
Author: Khalid, Ali
Abstract: The study deals with the ecology and taxonomy of the vegetation of Um Rimmitta area, White Nile State. Taxonomic studies included collection, preparation, identification and classification of plant species in the study area. In the present study (85) species were identified belonging to 30 families. Botanic names and synonyms have been updated. Brief descriptions of the collected specimens have been included. Medicinal and other uses have been given. Almost 49.4% of the species were found to have medicinal uses. Moreover, a check-list of endangered, extinct and famine food plants has been provided. Seven ecological parameters have been studied. These were density, abundance, frequency, diversity, association between species, dominance of woody species and site similarity. The total density of woody species in the study area was found to be 19.3 stems/ha. It was also found that the density of trees and shrubs differed from one site to another according to topography. The density of Acacia tortilis subsp. spirocarpa was associated with high frequency and abundance. A positive association was observed between Acacia tortilis subsp. spirocarpa and A. tortilis subsp. raddiana. The soil seed bank was analyzed for the number of live and dead seeds at each of the three depths within the study area. The analysis revealed the following: The seed bank density was higher in the upper soil depths as compared to the lower levels. It was found that the seed density decreases with increasing depth. The live seed density ranged from 1015 – 5371 seeds/m2, whereas the density of the dead seeds ranged from 3215- 6957 seeds/m2. The dominant plant species to which the live seeds belong were Schoenefeldia gracilis, Brachiaria spp., Dactyloctenium aegyptium and Aristida spp., whereas the dominant species to which the dead seeds belong were Panicum turgidum, Euphorbia aegyptiaca and Cyperus rotundus. The results of biomass and carrying capacity showed that there was a decline in the carrying capacity from 26 a.u. /km2/year to 3 a.u. /km2/yeary. The total biomass of the study area was found to be 33540.5 kg/km2. Natural regeneration of woody species at the study area was found to be 421 seedlings/ha. The dominant regenerating species was Acacia tortilis subsp. spirocarpa. The average canopy cover/m2 was determined for each of the three sites in the study area and it was found to be 1062 m2 /ha. Accordingly, the study area was classified by FAO (2000) as other wooded land. The present study revealed that the soil moisture content was relatively low at the study area. The chemical analysis of the soil revealed that there were no significant differences between the three sites in the study area, with respect to soil elements. However, there were significant differences between the three sites in their pH values.
URI: http://khartoumspace.uofk.edu/handle/123456789/9186
Date: 2015-04-21


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