Shrubs Associations in Relation to Ecology of Savannah Rangelands at El Suki Area, Sennar State, Sudan

Not all of the Sudan has been covered by post studies; and parts of it seemed more favoured research topic of the others. The first attempt to study the flora of the study area was in 1958, which included in the work of Harrison and Jackson about classification of the Sudan vegetation. The study area was very rich of plant diversity, especially trees and shrubs, because of the high rainfall and a good climate and rich soil. This study is an attempt to investigate and update the associations between the shrubs species to know their ecological positions among the vegetation cover of the Savannah range lands. A field survey was conducted in the two seasons of 2011-2012 and 2012 - 2013 at the southeastern part of Sinnar State. Five major transects were taken, each of 3000 m length and 10 m width, in a total area of 150.000 m2. Results showed that Acacia oerfota is the dominant shrub species throughout the study area, with Acacia mellifra and Combretum aculeatum as ecological associates in relationship, because they were abundant, frequent and of high density, and less diversity in the Savannah Rangelands at El Suki Area, Sennar State, Sudan in the two seasons of survey.