The present study deals with the assessment of the effects of drought on the natural plant cover of two natural regions of Southern Tunisia. Several parameters and indicators have been used to describe the evolution of plant communities and their fate under the different constraints and disturbances effect. The main achieved results show that relations between soil and climatic conditions and plant cover are strongly influenced by the human activities impact. The highest specific flora richness has been recorded at the experimental stations of the Jeffara (sandy steppe). The impact of drought on plant cover was more important in the experimental stations presenting higher plant density mainly Artemisia herba-alba, Gymnocarpos decander and Hammada scoparia which are considered as key species of some ecosystems.
Farah Ben Salem, Mohamed Tarhouni , Azaiez Ouled Belgacem and Mohamed Neffati , 2007. Impact of Drought on Plant Cover Dynamics in Two Natural Areas of Southern Tunisia. Journal of Biological Sciences, 7: 1539-1544.