Doi: 10.4000/Gc.200
ChinaXiv合作期刊 J Arid Land https://doi.org/10.1007/s40333-018-0095-x Rainfall patterns of Algerian steppes and the impacts on natural vegetation in the 20th century Fahima BELALA1*, Azziz HIRCHE1,2, Serge D MULLER3, Mahmoud TOURKI4, Mostefa SALAMANI1, Mohamed GRANDI1,5, Tahar AIT HAMOUDA6, Madjid BOUGHANI1 1 Laboratory of Plant Ecology, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene, Wilaya 16000, Algeria; 2 Scientific and Technical Research Center on Arid Regions, Biskra 7000, Algeria; 3 Institute of Evolutionary Sciences, University of Montpellier-CNRS, Montpellier 34095, France; 4 Department of Hydraulics, University of Badji Mokhtar, Annaba 23000, Algeria; 5 Faculty of Nature Sciences, University of Saad Dahlab, Blida 9000, Algeria; 6 Faculty of Sciences, University of Yahia Farès, Wilaya 26000, Algeria Abstract: Since 1960, the steppe regions of North Africa have been subject to an increasing desertification, including the degradation of traditional pastures. The initially dominant species (Artemisia herba-alba, Lygeum spartum and Stipa tenacissima) declined and were progressively replaced by other species (Atractylis serratuloides and Salsola vermiculata) that are more tolerant to the new conditions. It is not clear whether these changes are due to anthropogenic reasons or climatic determinism. We have carried out a statistical analysis of the climate to detect putative rainfall changes during the 20th century in the Algerian steppes based on data from 9 meteorological stations, including 2 Saharan stations (El Oued and Touggourt), 3 pre-Saharan stations (Biskra, Laghouat and Ain Sefra) and 4 steppe stations (Djelfa, Saida, Méchéria and El-Bayadh) located in the arid high plains, which represent the bioclimate diversities of the region.
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