Degradation of the vegetation cover in the White Nile State (Elgetaina Area)
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The study was carried out in, White Nile State (East of Elgetaina town) during 2004- 2006. The selected site was dominated by Capparis decidua shrubs and Panicum tergidum grasses. The main objectives of the study were to investigate the limitation for natural regeneration of vegetation cover by studying the variation in rainfall amount and distribution, evaluating the soil properties and assessing the soil seed bank. The study aimed to suggest some measures to enhance the natural regeneration of the vegetation cover. The site was divided into four Blocks. Soil samples were taken from each Block, soil seed bank and soil chemical properties were determined. In addition, the vegetation density was estimated for each Block for trees, shrubs and grasses. Satellite imageries were used to monitor the change in the vegetation cover (Land uses and bare area maps). The results showed that the mean annual rainfall and distribution for the period 1987-2005, and soil seed bank has little effect on degradation of vegetation cover in the study area, and that the main cause of vegetation cover degradation is the deteriorated soil properties. The high sodicity/salinity reduced the seeds germination and the infiltration rate of the soil and most of rainfall is lost as runoff. Most of the study area is now bare (no vegetation). The study recommended use of water harvesting methods, soil reclamation with organic and inorganic materials and enrichment of soil seed bank for rehabilitation of the vegetation cover.
Key words: soil reclamation, Sodicity, salinity, soil seed bank
ID: 3473098