Vegetation Succession In The Volcanic Region Between Kulumsa And Metahara

Six sites '/ere studied in the Ethiopian Rift Valley inrnthe Administrative Regions of Shoa and Arsi Vhere volcanicrneruptions had taken place at different times. The aim ofrnthe study ~las to determine vegetational succession on thesernvolcanic rocks according to the chronosequence. The studyrnVas made from December 26, 1980 to February 6, 1982. FortyrntVo stands ~lere sampled (seven in each site) and the presencernof 172 species in the stands Vas recorded.rnComputer analysis of the raV data using Normal AssociationrnAnalysis Vas made at the Central Statistical Officern(C.S.O) in Addis Ababa and using Indicator species Analysisrn(I.S.A.) at the Ethiopian Road Authority (E.R.A).rnIndicator species Analysis divided the vegetation in thernstudy areas into groups according to the chronosequence whilernthat using Normal Association Analysis did not.rnThe groupings obtained from the Normal AssvciationrnAnalysis and the Indicator species Analysis ~lere statisticallyrntested for significan't contrasts.rnWolenchiti (third in chron0sequence) was found to havernthe highest number of grass and herb species. The successionalrntrend for all species of plants showed an increase from thernfirst upto the third age levels and a decrease in the fourthrnand fifth age levels except for the shrub species where thernfifth age level showed the maximum number.

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